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ROLLOUT 7 · facebookresearch/hydra

facebookresearch__hydra-273

Not solved
460 stotal time
22tool calls
23model calls
6,258tokens generated
216,931prompt tokens read

Test failures/errors recorded in JUnit XML (failures=2, errors=0)

⚠ The request log has 23 model calls but the trace has 24 agent calls, so tokens are listed separately instead of beside each turn.

Turn by turn

Token shading: p ≥ 0.9 0.5 – 0.9 0.2 – 0.5 below 0.2. Hover a token for its id and probability.

System instructions 4,822 characters
You are a principal Python software engineer resolving a repository issue in `/workspace`.
Your sole objective is to produce a minimal, root-cause source patch that passes every hidden fail-to-pass and pass-to-pass regression test on the first grading run.

## Critical Environment & Grader Rules
1. **Air-Gapped Sandbox & Available CLI Tools**: No network access. Never run `pip`, `uv`, `conda`, or `git fetch`. Note: `rg` (`ripgrep`) is NOT installed in the container — always use `grep -rn --include="*.py"` for fast exact searches so you never waste a tool call on `command not found`.
2. **Protected Grading Paths**: Before running official verification, the grading harness **strips and reverts all changes** to `tests/`, `test/`, `testing/`, `test_*.py`, `*_test.py`, `conftest.py`, `pyproject.toml`, `setup.cfg`, `pytest.ini`, and `tox.ini`. Every part of your fix MUST reside in non-test production source files.
3. **Untracked File Trap (`git add -N .`)**: `submit_patch` stages ALL untracked files inside `/workspace`! Never leave reproduction or scratch files inside `/workspace` — run reproductions inline via `python3 - <<'PY'` or inside `/tmp/repro.py` in a single `run_command`.
4. **Stdout Truncation Rule**: `run_command` truncates stdout after the first 5,000 characters from the TOP. Always run pytest quietly with short tracebacks:
   `pytest path/to/test_file.py -k pattern -q --tb=short --no-header`
   If a test file is large, redirect output to `/tmp/pytest.log` and inspect `tail -n 80 /tmp/pytest.log` so failure tracebacks at the bottom are never cut off.
5. **Strict Pacing Discipline**: `get_status` and `submit_patch` are free and do NOT count toward `max_tool_calls`. Target **16-22 counted tool calls total**, and **begin your first `edit_file` change no later than tool call 15**. Reserve at least 4 calls for verification, `git status --short && git diff`, and submission.

## Execution Protocol

### Phase 1 — Pinpoint Code & Tests Immediately (1-2 tool calls)
- The user message already contains `Workspace Layout` — do NOT waste a turn running `ls` on top-level directories.
- Run a single compound `run_command` with `grep -rn --include="*.py"` to locate:
  (a) the exact symbols, error strings, or functions from the problem description,
  (b) **all parallel or sibling implementations** (for example sync + async variants, `Client` + `AsyncClient`, serializer + deserializer, multiple backends/dialects, base + subclass methods, `__init__.py` / `__all__` exports), and
  (c) the closest existing unit test files under `tests/`.

### Phase 2 — Deep Read & Spec Anchor (2-5 tool calls)
- Use `read_file` with generous `start_line` and `end_line` windows (180-300 lines per call so you read whole modules in fewer calls) on the target function/class, callers, type annotations, and neighboring tests.
- Before editing, verify every explicit and implicit requirement from the issue: exact parameter names, defaults, boundary/domain edge cases, exception types/messages, `None` vs empty collection vs falsy (`0`, `False`, `""`) semantics, mutability/copying, and return types.

### Phase 3 — Reproduce Bug in One Call (1 tool call)
- Run ONE concise command (`python3 - <<'PY' ... PY` or targeted `pytest ... -q --tb=short --no-header`) via `run_command` to observe the exact pre-fix failure. Do NOT spend multiple tool calls writing separate reproduction scripts.

### Phase 4 — Surgical Implementation Across All Parallel Paths (1-4 tool calls)
- Begin editing by tool call 15! Use `edit_file` with 4-6 lines of exact surrounding context copied from `read_file`.
- Update ALL parallel codepaths (sync/async, multiple classes/dialects, type hints) consistently so partial fixes do not fail sibling tests.
- **2-Strike Edit Rule**: If `edit_file` fails twice on the same block due to whitespace or escaping, do not retry `edit_file` a third time — apply an atomic Python transformation via `run_command` and immediately verify `python3 -m py_compile path/to/file.py`.

### Phase 5 — Edge-Case Verification, Diff Hygiene & Clean Exit (2-4 tool calls)
- Run a single compound `run_command` testing both your reproduction + boundary edge cases (`None`, empty input, leading/trailing delimiters, subdomain/prefix boundaries, subclass/async parity) AND the relevant existing `pytest` module(s) with `-q --tb=short --no-header`.
- Run `git status --short && git diff` via `run_command`. Confirm:
  - ZERO untracked (`??`) files in `/workspace` (`rm -f` any untracked workspace files immediately),
  - ZERO modifications to `tests/` or protected config files (`git checkout -- tests/` if touched),
  - Minimal, clean diff with valid imports and indentation.
- Call `submit_patch` once verification passes, then respond with a brief 2-sentence plain-text summary and make NO further tool calls.
Task prompt 6,076 characters
You are evaluating a software engineering task for repository facebookresearch/hydra.

Problem Statement:
[Bug] handle yaml file with dot in the name
# 🐛 Bug

<!-- A clear and concise description of what the bug is. -->
When creating yaml file that has dot in the base name, `config_loader.py` erroneously misses the `.yaml` extension which results in a `hydra.errors.MissingConfigException`.

## To reproduce
configuration groups:
```
├── conf
│   └── lr
│       ├── 0.1.yaml
│       └── 0.01.yaml
└── my_app.py
```
with minimum `my_app.py` setup same as in the tutorial
```
python my_app.py lr=0.1
```
Traceback:
```
Traceback (most recent call last):
  File "app.py", line 9, in <module>
    app()
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/main.py", line 24, in decorated_main
    strict=strict,
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/utils.py", line 56, in run_hydra
    hydra.run(overrides=args.overrides)
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/hydra.py", line 103, in run
    cfg = self._load_config(overrides)
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/hydra.py", line 345, in _load_config
    cfg = self.config_loader.load_configuration(overrides)
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 56, in load_configuration
    cfg = self._merge_defaults(hydra_cfg, defaults, split_at)
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 395, in _merge_defaults
    cfg = merge_defaults(cfg, user_list)
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 374, in merge_defaults
    required=not is_optional,
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 301, in _merge_config
    raise MissingConfigException(msg, new_cfg, options)
hydra.errors.MissingConfigException: Could not load lr/0.1, available options:
lr:
	0.01
	0.1
```
## Questions
- Currently, I have to edit `config_loader.py` file to add the `.yaml` extension whenever it is missing. Would this cause any unwanted behavior with other features? 
- Is it generally not advisable to name config files with, say, float values? Are there better ways to incorporate float values in the config?

## Task Budget (Session terminates when any budget is exhausted)
- Time allowance: 7.5 minutes
- Tool calls allowance: 30 calls
- Max loop iterations: 40 turns

## Execution Environment Rules
- Single command timeout: 90 seconds (commands exceeding this fail without ending the session)
- Command output limit: 5000 characters
- File view limit: 150 lines per read_file call
- File character limit: 10000 characters per read_file call
- Environment is offline (no network/PyPI access). All repository and test dependencies are ALREADY pre-installed. Do NOT attempt to run pip install or download packages.

## Instructions:
0. All source code is under `/workspace`. Do NOT search outside `/workspace` (e.g. `/usr/`, `/wheels/`, system site-packages). If imports fail, the issue is in the source code under `/workspace`, not in missing system packages.
1. Analyze the problem statement and any provided hints carefully to identify all requested script paths, CLI subcommands, or Python modules.
2. Inspect existing codebase conventions and test files before making edits.
3. Verify your implementation using targeted tests or inline assertions before submitting.
4. Call submit_patch only after your implementation is complete and verified.
5. As your final action, you must return a text-only response reporting your completion to terminate the session.
## Workspace Layout
The repository is located at `/workspace`. Here is the directory tree (up to 3 levels):
```
./ATTRIBUTION
./ATTRIBUTION/LICENSE-sample-namespace-packages
./ATTRIBUTION/README.md
./CHANGELOG.md
./CODE_OF_CONDUCT.md
./CONTRIBUTING.md
./LICENSE
./MANIFEST.in
./NEWS.rst
./README.md
./examples
./hydra
./hydra/__init__.py
./hydra/_internal
./hydra/_internal/__init__.py
./hydra/_internal/config_loader.py
./hydra/_internal/config_search_path.py
./hydra/_internal/core_plugins
./hydra/_internal/hydra.py
./hydra/_internal/pathlib.py
./hydra/_internal/plugins.py
./hydra/_internal/utils.py
./hydra/conf
./hydra/conf/__init__.py
./hydra/conf/hydra
./hydra/conf/hydra.yaml
./hydra/errors.py
./hydra/main.py
./hydra/plugins
./hydra/plugins/__init__.py
./hydra/plugins/common
./hydra/plugins/completion_plugin.py
./hydra/plugins/launcher.py
./hydra/plugins/plugin.py
./hydra/plugins/search_path_plugin.py
./hydra/plugins/step_sweeper.py
./hydra/plugins/sweeper.py
./hydra/test_utils
./hydra/test_utils/__init__.py
./hydra/test_utils/a_module.py
./hydra/test_utils/completion.py
./hydra/test_utils/configs
./hydra/test_utils/launcher_common_tests.py
./hydra/test_utils/test_utils.py
./hydra/utils.py
./news
./news/251.docs
./news/251.feature
./news/254.feature
./news/261.bugfix
./news/266.bugfix
./news/53.plugin
./news/_template.rst
./noxfile.py
./plugins
./plugins/examples
./plugins/examples/example_launcher
./plugins/examples/example_plugin
./plugins/hydra_colorlog
./plugins/hydra_colorlog/MANIFEST.in
./plugins/hydra_colorlog/README.md
./plugins/hydra_colorlog/example
./plugins/hydra_colorlog/hydra_plugins
./plugins/hydra_colorlog/setup.py
./plugins/hydra_colorlog/tests
./pyproject.toml
./pytest.ini
./setup.py
./tests
./website
./website/README.md
./website/docs
./website/docs/advanced
./website/docs/configure_hydra
./website/docs/development
./website/docs/getting_started.md
./website/docs/index.html
./website/docs/intro.md
./website/docs/patterns
./website/docs/plugins
./website/docs/tutorial
./website/docusaurus.config.js
./website/package.json
./website/sidebars.js
./website/src
./website/src/components
./website/src/css
./website/src/pages
./website/static
./website/static/CNAME
./website/static/img
./website/static/plugins
./website/yarn.lock
```
Turn 1at 34 s433 tokens out3,991 prompt tokens
The user is reporting a bug in `hydra` where YAML files with dots in their names (e.g., `0.1.yaml`) are not handled correctly, leading to a `MissingConfigException`.
The traceback points to `hydra/_internal/config_loader.py` and `_merge_config` method.

The user says: "When creating yaml file that has dot in the base name, `config_loader.py` erroneously misses the `.yaml` extension".

Let's analyze the provided traceback:
- `hydra/_internal/hydra.py` -> `_load_config` -> `config_loader.load_configuration`
- `hydra/_internal/config_loader.py` -> `load_configuration` -> `_merge_defaults` -> `merge_defaults` -> `_merge_config`
- `_merge_config` raises `MissingConfigException: Could not load lr/0.1, available options: lr: 0.01 0.1`

Wait, the available options listed are `0.01` and `0.1`. But it says "Could not load lr/0.1". This is weird. It's as if it's looking for `lr/0.1` without the extension and failing, even though `0.1` is one of the available options.

Wait, if the files are `0.1.yaml` and `0.01.yaml`, usually Hydra removes the extension when listing available options. So `0.1` and `0.01` are the correct names.

If it's trying to load `lr/0.1` and failing, maybe it's not appending `.yaml` correctly?

Let's examine `hydra/_internal/config_loader.py`.
TOOL CALL · run_command
{
  "command": "grep -rn --include=\"*.py\" \"MissingConfigException\" hydra/_internal/config_loader.py"
}
Result of run_command 253 characters
{
  "status": "ok",
  "stdout": "18:from ..errors import MissingConfigException\n299:                    raise MissingConfigException(msg, new_cfg)\n308:                    raise MissingConfigException(msg, new_cfg, options)\n",
  "stderr": "",
  "exit_code": 0
}
Turn 2at 40 s94 tokens out4,511 prompt tokens
The traceback said `hydra/_internal/config_loader.py`, line 301, in `_merge_config`.
Let's read `hydra/_internal/config_loader.py` around line 301.
TOOL CALL · read_file
{
  "end_line": 350,
  "filepath": "hydra/_internal/config_loader.py",
  "start_line": 250
}
Result of read_file 4,265 characters
{
  "status": "ok",
  "filepath": "hydra/_internal/config_loader.py",
  "content": "                    \"{}/{}\".format(path, group_name)\n                )\n                if self._exists(is_pkg, path) and resource_isdir(\n                    module_name, resource_name\n                ):\n                    all_files = resource_listdir(module_name, resource_name)\n                    files = []\n                    for file in all_files:\n                        if (\n                            file_type == \"dir\"\n                            and resource_isdir(\n                                module_name, os.path.join(group_name, file)\n                            )\n                            and file != \"__pycache__\"\n                        ):\n                            files.append(file)\n                        elif file_type == \"file\" and file.endswith(\".yaml\"):\n                            files.append(file[0 : -len(\".yaml\")])\n            else:\n                group_path = \"{}/{}\".format(path, group_name)\n                if os.path.isdir(group_path):\n                    all_files = os.listdir(group_path)\n                    files = []\n                    for file in all_files:\n                        full_path = os.path.join(group_path, group_name, file)\n                        if (\n                            file_type == \"dir\"\n                            and os.path.isdir(full_path)\n                            and file != \"__pycache__\"\n                        ):\n                            files.append(file)\n                        elif file_type == \"file\" and file.endswith(\".yaml\"):\n                            files.append(file[0 : -len(\".yaml\")])\n\n            options.extend(files)\n        return options\n\n    def _merge_config(self, cfg, family, name, required):\n\n        if family != \"\":\n            new_cfg = \"{}/{}\".format(family, name)\n        else:\n            new_cfg = name\n\n        loaded_cfg = self._load_config_impl(new_cfg)\n        if loaded_cfg is None:\n            if required:\n                if family == \"\":\n                    msg = \"Could not load {}\".format(new_cfg)\n                    raise MissingConfigException(msg, new_cfg)\n                else:\n                    options = self.get_group_options(family)\n                    if options:\n                        msg = \"Could not load {}, available options:\\n{}:\\n\\t{}\".format(\n                            new_cfg, family, \"\\n\\t\".join(options)\n                        )\n                    else:\n                        msg = \"Could not load {}\".format(new_cfg)\n                    raise MissingConfigException(msg, new_cfg, options)\n            else:\n                return cfg\n\n        else:\n            return OmegaConf.merge(cfg, loaded_cfg)\n\n        assert False\n\n    @staticmethod\n    def _split_module_and_resource(filename):\n        sep = filename.find(\"/\")\n        if sep == -1:\n            module_name = filename\n            resource_name = \"\"\n        else:\n            module_name = filename[0:sep]\n            resource_name = filename[sep + 1 :]\n        if module_name == \"\":\n            # if we have a module a module only, dirname would return nothing and basename would return the module.\n            module_name = resource_name\n            resource_name = \"\"\n\n        return module_name, resource_name\n\n    @staticmethod\n    def _exists(is_pkg, filename):\n        if is_pkg:\n            module_name, resource_name = ConfigLoader._split_module_and_resource(\n                filename\n            )\n            try:\n                ret = resource_exists(module_name, resource_name)\n            except ImportError:\n                ret = False\n            except ValueError:  # Python 2.7 throws ValueError empty module name sometimes.\n                ret = False\n            except NotImplementedError:\n                raise NotImplementedError(\n                    \"Unable to load {}/{}, are you missing an __init__.py?\".format(\n                        module_name, resource_name\n                    )\n                )",
  "start_line": 250,
  "end_line": 350,
  "total_lines": 453,
  "is_truncated": false
}
Turn 3at 46 s93 tokens out5,627 prompt tokens
The `_merge_config` method calls `self._load_config_impl(new_cfg)`.
If `loaded_cfg` is `None`, it raises `MissingConfigException`.

Let's look at `_load_config_impl`.
TOOL CALL · run_command
{
  "command": "grep -rn \"def _load_config_impl\" hydra/_internal/config_loader.py"
}
Result of run_command 128 characters
{
  "status": "ok",
  "stdout": "201:    def _load_config_impl(self, input_file, record_load=True):\n",
  "stderr": "",
  "exit_code": 0
}
Turn 4at 48 s54 tokens out5,784 prompt tokens
Let's read `_load_config_impl`.
TOOL CALL · read_file
{
  "end_line": 230,
  "filepath": "hydra/_internal/config_loader.py",
  "start_line": 180
}
Result of read_file 2,210 characters
{
  "status": "ok",
  "filepath": "hydra/_internal/config_loader.py",
  "content": "            key1 = next(keys_iter)\n            if key1 == \"optional\":\n                key1 = next(keys_iter)\n            return key1\n\n        key_to_idx = {}\n        for idx, d in enumerate(primary):\n            if isinstance(d, (dict, DictConfig)):\n                key = get_key(d)\n                key_to_idx[key] = idx\n        for d in copy.deepcopy(merged_list):\n            if isinstance(d, (dict, DictConfig)):\n                key = get_key(d)\n                if key in key_to_idx.keys():\n                    idx = key_to_idx[key]\n                    primary[idx] = d\n                    merged_list.remove(d)\n\n        for d in merged_list:\n            primary.append(d)\n\n    def _load_config_impl(self, input_file, record_load=True):\n        \"\"\"\n        :param input_file:\n        :param record_load:\n        :return: the loaded config or None if it was not found\n        \"\"\"\n        loaded_cfg = None\n        filename, search_path = self._find_config(input_file)\n        if search_path is None and record_load:\n            assert search_path is None\n            self.all_config_checked.append((filename, None, None))\n\n        if search_path is not None:\n            fullpath = \"{}/{}\".format(search_path.path, filename)\n            is_pkg = search_path.path.startswith(\"pkg://\")\n            if is_pkg:\n                fullpath = fullpath[len(\"pkg://\") :]\n                module_name, resource_name = ConfigLoader._split_module_and_resource(\n                    fullpath\n                )\n                with resource_stream(module_name, resource_name) as stream:\n                    loaded_cfg = OmegaConf.load(stream)\n                if record_load:\n                    self.all_config_checked.append(\n                        (filename, search_path.path, search_path.provider)\n                    )\n            elif os.path.exists(fullpath):\n                loaded_cfg = OmegaConf.load(fullpath)\n                if record_load:\n                    self.all_config_checked.append(",
  "start_line": 180,
  "end_line": 230,
  "total_lines": 453,
  "is_truncated": false
}
Turn 5at 55 s69 tokens out6,457 prompt tokens
`_load_config_impl` calls `self._find_config(input_file)`.
Let's look at `_find_config`.
TOOL CALL · run_command
{
  "command": "grep -rn \"def _find_config\" hydra/_internal/config_loader.py"
}
Result of run_command 103 characters
{
  "status": "ok",
  "stdout": "117:    def _find_config(self, filepath):\n",
  "stderr": "",
  "exit_code": 0
}
Turn 6at 60 s49 tokens out6,580 prompt tokens
Reading `_find_config`.
TOOL CALL · read_file
{
  "end_line": 175,
  "filepath": "hydra/_internal/config_loader.py",
  "start_line": 110
}
Result of read_file 2,667 characters
{
  "status": "ok",
  "filepath": "hydra/_internal/config_loader.py",
  "content": "    def _split_path(path):\n        prefix = \"pkg://\"\n        is_pkg = path.startswith(prefix)\n        if is_pkg:\n            path = path[len(prefix) :]\n        return is_pkg, path\n\n    def _find_config(self, filepath):\n        found_search_path = None\n        for search_path in self.config_search_path.config_search_path:\n            is_pkg, path = self._split_path(search_path.path)\n            config_file = \"{}/{}\".format(path, filepath)\n            if self._exists(is_pkg, config_file):\n                found_search_path = search_path\n                break\n        return filepath, found_search_path\n\n    @staticmethod\n    def _split_key_val(s):\n        assert \"=\" in s, \"'{}' not a valid override, expecting key=value format\".format(\n            s\n        )\n\n        idx = s.find(\"=\")\n        assert idx != -1\n        return s[0:idx], s[idx + 1 :]\n\n    @staticmethod\n    def _apply_defaults_overrides(overrides, defaults):\n        consumed = []\n        key_to_idx = {}\n        for idx, d in enumerate(defaults):\n            if isinstance(d, DictConfig):\n                key = next(iter(d.keys()))\n                key_to_idx[key] = idx\n        for override in copy.deepcopy(overrides):\n            key, value = ConfigLoader._split_key_val(override)\n            if key in key_to_idx:\n                if \",\" in value:\n                    # If this is a multirun config (comma separated list), flag the default to prevent it from being\n                    # loaded until we are constructing the config for individual jobs.\n                    value = \"_SKIP_\"\n\n                if value == \"null\":\n                    del defaults[key_to_idx[key]]\n                else:\n                    defaults[key_to_idx[key]][key] = value\n\n                overrides.remove(override)\n                consumed.append(override)\n        return consumed\n\n    def _apply_free_defaults(self, defaults, overrides):\n        consumed = []\n        for override in overrides:\n            key, value = ConfigLoader._split_key_val(override)\n            if self.exists_in_search_path(key):\n                # Do not add multirun configs into defaults, those will be added to the defaults\n                # during the runs after list is broken into items\n                if \",\" not in value:\n                    defaults.append({key: value})\n                overrides.remove(override)\n                consumed.append(override)\n\n        return consumed\n",
  "start_line": 110,
  "end_line": 175,
  "total_lines": 453,
  "is_truncated": false
}
Turn 7at 87 s349 tokens out7,372 prompt tokens
Wait, `_find_config` doesn't seem to add the `.yaml` extension.
It just checks if `config_file = "{}/{}".format(path, filepath)` exists using `self._exists(is_pkg, config_file)`.

If `filepath` is `lr/0.1`, and the file on disk is `lr/0.1.yaml`, then `_exists` will return `False` because it's looking for `lr/0.1` (without extension).

But Hydra is supposed to handle `.yaml` extensions. Let's see how it usually finds configs.
Wait, `OmegaConf.load` might handle extensions? No, `os.path.exists(fullpath)` is used in `_load_config_impl` for non-pkg paths.

If `filepath` is `lr/0.1`, then `fullpath` will be something like `conf/lr/0.1`. `os.path.exists('conf/lr/0.1')` will be `False` if the file is named `0.1.yaml`.

So the bug is that `_find_config` (or something before it) is not adding the `.yaml` extension if it's missing.

Wait, if I have a file `config.yaml`, and I tell Hydra to load `config`, it should find `config.yaml`.

Let's check `_exists`.
TOOL CALL · read_file
{
  "end_line": 365,
  "filepath": "hydra/_internal/config_loader.py",
  "start_line": 340
}
Result of read_file 1,342 characters
{
  "status": "ok",
  "filepath": "hydra/_internal/config_loader.py",
  "content": "                ret = resource_exists(module_name, resource_name)\n            except ImportError:\n                ret = False\n            except ValueError:  # Python 2.7 throws ValueError empty module name sometimes.\n                ret = False\n            except NotImplementedError:\n                raise NotImplementedError(\n                    \"Unable to load {}/{}, are you missing an __init__.py?\".format(\n                        module_name, resource_name\n                    )\n                )\n            # Uncomment to debug issues with configs not getting loaded.\n            # WARNING: breaks integration tests that relies on specified output from the process.\n            # print(\"_exists? {}, {} == {}\".format(module_name, resource_name, ret))\n            return ret\n        else:\n            return os.path.exists(filename)\n\n    def _merge_defaults(self, cfg, defaults, split_at):\n        def get_filename(config_name):\n            filename, ext = os.path.splitext(config_name)\n            if ext == \"\":\n                ext = \".yaml\"\n            return \"{}{}\".format(filename, ext)\n\n        def merge_defaults(merged_cfg, def_list):",
  "start_line": 340,
  "end_line": 365,
  "total_lines": 453,
  "is_truncated": false
}
Turn 8at 101 s197 tokens out8,067 prompt tokens
Wait! Look at line 353:
```python
    def _merge_defaults(self, cfg, defaults, split_at):
        def get_filename(config_name):
            filename, ext = os.path.splitext(config_name)
            if ext == "":
                ext = ".yaml"
            return "{}{}".format(filename, ext)
```
This `get_filename` helper function seems to do exactly what's needed: it adds `.yaml` if there's no extension.
However, this `get_filename` is defined INSIDE `_merge_defaults`. Is it used?

Let's see where `_merge_defaults` is defined and used.
TOOL CALL · read_file
{
  "end_line": 375,
  "filepath": "hydra/_internal/config_loader.py",
  "start_line": 348
}
Result of read_file 1,469 characters
{
  "status": "ok",
  "filepath": "hydra/_internal/config_loader.py",
  "content": "                        module_name, resource_name\n                    )\n                )\n            # Uncomment to debug issues with configs not getting loaded.\n            # WARNING: breaks integration tests that relies on specified output from the process.\n            # print(\"_exists? {}, {} == {}\".format(module_name, resource_name, ret))\n            return ret\n        else:\n            return os.path.exists(filename)\n\n    def _merge_defaults(self, cfg, defaults, split_at):\n        def get_filename(config_name):\n            filename, ext = os.path.splitext(config_name)\n            if ext == \"\":\n                ext = \".yaml\"\n            return \"{}{}\".format(filename, ext)\n\n        def merge_defaults(merged_cfg, def_list):\n            cfg_with_list = OmegaConf.create(dict(defaults=def_list))\n            for default1 in cfg_with_list.defaults:\n                if isinstance(default1, DictConfig):\n                    is_optional = False\n                    if default1.optional is not None:\n                        is_optional = default1.optional\n                        del default1[\"optional\"]\n                    family = next(iter(default1.keys()))\n                    name = default1[family]\n                    # Name is none if default value is removed",
  "start_line": 348,
  "end_line": 375,
  "total_lines": 453,
  "is_truncated": false
}
Turn 9at 104 s53 tokens out8,644 prompt tokens
Let's read further into `merge_defaults`.
TOOL CALL · read_file
{
  "end_line": 400,
  "filepath": "hydra/_internal/config_loader.py",
  "start_line": 376
}
Result of read_file 1,180 characters
{
  "status": "ok",
  "filepath": "hydra/_internal/config_loader.py",
  "content": "                    if name is not None and \"_SKIP_\" not in name:\n                        merged_cfg = self._merge_config(\n                            cfg=merged_cfg,\n                            family=family,\n                            name=get_filename(name),\n                            required=not is_optional,\n                        )\n                else:\n                    assert isinstance(default1, str)\n                    if \"_SKIP_\" not in default1:\n                        merged_cfg = self._merge_config(\n                            cfg=merged_cfg,\n                            family=\"\",\n                            name=get_filename(default1),\n                            required=True,\n                        )\n            return merged_cfg\n\n        system_list = []\n        user_list = []\n        for default in defaults:\n            if len(system_list) < split_at:\n                system_list.append(default)\n            else:\n                user_list.append(default)",
  "start_line": 376,
  "end_line": 400,
  "total_lines": 453,
  "is_truncated": false
}
Turn 10at 127 s314 tokens out8,981 prompt tokens
Ok, `merge_defaults` uses `get_filename(name)`.
And `get_filename` is:
```python
        def get_filename(config_name):
            filename, ext = os.path.splitext(config_name)
            if ext == "":
                ext = ".yaml"
            return "{}{}".format(filename, ext)
```
If `name` is `0.1`, `os.path.splitext("0.1")` returns `('0', '.1')`.
Wait! `os.path.splitext("0.1")` returns `('0', '.1')`!
Because `.1` is treated as the extension.
So `ext` is `.1`, and it's not `""`.
So `get_filename("0.1")` returns `"0.1"`.
But we wanted `0.1.yaml`.

That's the bug! `os.path.splitext` is not the right way to check if a Hydra config name has an extension, because Hydra config names can have dots in them and still not have a `.yaml` extension.

Hydra should probably check if the name ends with `.yaml`.

Let's verify this behavior with a quick script.
TOOL CALL · run_command
{
  "command": "python3 - <<'PY'\nimport os\nprint(os.path.splitext(\"0.1\"))\nPY\n"
}
Result of run_command 73 characters
{
  "status": "ok",
  "stdout": "('0', '.1')\n",
  "stderr": "",
  "exit_code": 0
}
Turn 11at 174 s684 tokens out9,341 prompt tokens
Yes, `os.path.splitext("0.1")` is `('0', '.1')`.

So `get_filename` in `_merge_defaults` fails when the config name has a dot but no `.yaml` extension.

Wait, is `get_filename` used anywhere else?
It is defined inside `_merge_defaults`, so it's only used there.

Wait, the issue description says "Currently, I have to edit `config_loader.py` file to add the `.yaml` extension whenever it is missing."

If I change `get_filename` to:
```python
        def get_filename(config_name):
            if not config_name.endswith(".yaml"):
                return "{}.yaml".format(config_name)
            return config_name
```
This would fix the issue for `0.1`.

But wait, does Hydra support other extensions? The code currently only looks for `.yaml`.
Let's see if there are other extensions mentioned.
In `get_group_options` (which I saw earlier):
```python
                        elif file_type == "file" and file.endswith(".yaml"):
                            files.append(file[0 : -len(".yaml")])
```
It seems only `.yaml` is supported.

Wait, let's check if `OmegaConf` supports other extensions. `OmegaConf.load` supports YAML files.

Let's look at `_merge_defaults` again.

```python
    def _merge_defaults(self, cfg, defaults, split_at):
        def get_filename(config_name):
            filename, ext = os.path.splitext(config_name)
            if ext == "":
                ext = ".yaml"
            return "{}{}".format(filename, ext)
```

If the user provides `config.yaml`, `os.path.splitext("config.yaml")` is `('config', '.yaml')`. `ext` is `.yaml`. It returns `config.yaml`. Correct.
If the user provides `config`, `os.path.splitext("config")` is `('config', '')`. `ext` is `""`. It returns `config.yaml`. Correct.
If the user provides `0.1`, `os.path.splitext("0.1")` is `('0', '.1')`. `ext` is `.1`. It returns `0.1`. Incorrect.

So we should change it to:
```python
        def get_filename(config_name):
            if config_name.endswith(".yaml"):
                return config_name
            return "{}.yaml".format(config_name)
```

Wait, what if the file has another extension? Like `.yml`?
Hydra seems to only use `.yaml` based on the `get_group_options` code I read earlier.

Let's double check `get_group_options` again.
TOOL CALL · read_file
{
  "end_line": 250,
  "filepath": "hydra/_internal/config_loader.py",
  "start_line": 200
}
Result of read_file 2,412 characters
{
  "status": "ok",
  "filepath": "hydra/_internal/config_loader.py",
  "content": "\n    def _load_config_impl(self, input_file, record_load=True):\n        \"\"\"\n        :param input_file:\n        :param record_load:\n        :return: the loaded config or None if it was not found\n        \"\"\"\n        loaded_cfg = None\n        filename, search_path = self._find_config(input_file)\n        if search_path is None and record_load:\n            assert search_path is None\n            self.all_config_checked.append((filename, None, None))\n\n        if search_path is not None:\n            fullpath = \"{}/{}\".format(search_path.path, filename)\n            is_pkg = search_path.path.startswith(\"pkg://\")\n            if is_pkg:\n                fullpath = fullpath[len(\"pkg://\") :]\n                module_name, resource_name = ConfigLoader._split_module_and_resource(\n                    fullpath\n                )\n                with resource_stream(module_name, resource_name) as stream:\n                    loaded_cfg = OmegaConf.load(stream)\n                if record_load:\n                    self.all_config_checked.append(\n                        (filename, search_path.path, search_path.provider)\n                    )\n            elif os.path.exists(fullpath):\n                loaded_cfg = OmegaConf.load(fullpath)\n                if record_load:\n                    self.all_config_checked.append(\n                        (filename, search_path.path, search_path.provider)\n                    )\n            else:\n                # This should never happen because we just searched for it and found it\n                assert False, \"'{}' not found\".format(fullpath)\n        return loaded_cfg\n\n    def list_groups(self, parent_name):\n        ret = list(set(self.get_group_options(parent_name, file_type=\"dir\")))\n        return ret\n\n    def get_group_options(self, group_name, file_type=\"file\"):\n        options = []\n        for search_path in self.config_search_path.config_search_path:\n            search_path = search_path.path\n            is_pkg, path = self._split_path(search_path)\n            files = []\n            if is_pkg:\n                module_name, resource_name = ConfigLoader._split_module_and_resource(\n                    \"{}/{}\".format(path, group_name)",
  "start_line": 200,
  "end_line": 250,
  "total_lines": 453,
  "is_truncated": false
}
Turn 12at 177 s56 tokens out10,686 prompt tokens
I need to see the rest of `get_group_options`.
TOOL CALL · read_file
{
  "end_line": 300,
  "filepath": "hydra/_internal/config_loader.py",
  "start_line": 250
}
Result of read_file 2,357 characters
{
  "status": "ok",
  "filepath": "hydra/_internal/config_loader.py",
  "content": "                    \"{}/{}\".format(path, group_name)\n                )\n                if self._exists(is_pkg, path) and resource_isdir(\n                    module_name, resource_name\n                ):\n                    all_files = resource_listdir(module_name, resource_name)\n                    files = []\n                    for file in all_files:\n                        if (\n                            file_type == \"dir\"\n                            and resource_isdir(\n                                module_name, os.path.join(group_name, file)\n                            )\n                            and file != \"__pycache__\"\n                        ):\n                            files.append(file)\n                        elif file_type == \"file\" and file.endswith(\".yaml\"):\n                            files.append(file[0 : -len(\".yaml\")])\n            else:\n                group_path = \"{}/{}\".format(path, group_name)\n                if os.path.isdir(group_path):\n                    all_files = os.listdir(group_path)\n                    files = []\n                    for file in all_files:\n                        full_path = os.path.join(group_path, group_name, file)\n                        if (\n                            file_type == \"dir\"\n                            and os.path.isdir(full_path)\n                            and file != \"__pycache__\"\n                        ):\n                            files.append(file)\n                        elif file_type == \"file\" and file.endswith(\".yaml\"):\n                            files.append(file[0 : -len(\".yaml\")])\n\n            options.extend(files)\n        return options\n\n    def _merge_config(self, cfg, family, name, required):\n\n        if family != \"\":\n            new_cfg = \"{}/{}\".format(family, name)\n        else:\n            new_cfg = name\n\n        loaded_cfg = self._load_config_impl(new_cfg)\n        if loaded_cfg is None:\n            if required:\n                if family == \"\":\n                    msg = \"Could not load {}\".format(new_cfg)\n                    raise MissingConfigException(msg, new_cfg)\n                else:",
  "start_line": 250,
  "end_line": 300,
  "total_lines": 453,
  "is_truncated": false
}
Turn 13at 208 s369 tokens out11,320 prompt tokens
Yes, it uses `file.endswith(".yaml")` and then `file[0 : -len(".yaml")]`.
So it's hard-coded for `.yaml`.

Now let's reproduce this.
I'll create a reproduction script that mimics the issue.
TOOL CALL · run_command
{
  "command": "python3 - <<'PY'\nimport os\nfrom hydra import initialize, compose\nfrom omegaconf import OmegaConf\n\n# Create a config directory structure\nos.makedirs(\"conf/lr\", exist_ok=True)\nwith open(\"conf/lr/0.1.yaml\", \"w\") as f:\n    f.write(\"lr: 0.1\")\nwith open(\"conf/lr/0.01.yaml\", \"w\") as f:\n    f.write(\"lr: 0.01\")\n\n# Create a main config\nos.makedirs(\"conf\", exist_ok=True)\nwith open(\"conf/config.yaml\", \"w\") as f:\n    f.write(\"defaults:\\n  - lr: 0.1\")\n\ntry:\n    # Initialize Hydra\n    initialize(config_path=\"conf\", version_base=None)\n    # Compose the config. Using lr=0.1 explicitly to trigger the bug\n    cfg = compose(overrides=[\"lr=0.1\"])\n    print(\"Successfully loaded config:\", OmegaConf.to_yaml(cfg))\nexcept Exception as e:\n    print(\"Error:\", e)\n    import traceback\n    traceback.print_exc()\nfinally:\n    # Cleanup\n    import shutil\n    shutil.rmtree(\"conf\")\nPY\n"
}
Result of run_command 461 characters
{
  "status": "error",
  "error_type": "CommandError",
  "error_message": "Traceback (most recent call last):\n  File \"<stdin>\", line 2, in <module>\nImportError: cannot import name 'initialize' from 'hydra' (/workspace/hydra/__init__.py)\n",
  "details": {
    "stdout": "",
    "stderr": "Traceback (most recent call last):\n  File \"<stdin>\", line 2, in <module>\nImportError: cannot import name 'initialize' from 'hydra' (/workspace/hydra/__init__.py)\n",
    "exit_code": 1
  }
}
Turn 14at 215 s79 tokens out11,846 prompt tokens
Ah, I'm running the script from the root of the repo, and `hydra` is a package in the current directory.
Wait, `hydra/__init__.py` should export `initialize`.
Let's check `hydra/__init__.py`.
TOOL CALL · read_file
{
  "filepath": "hydra/__init__.py"
}
Result of read_file 443 characters
{
  "status": "ok",
  "filepath": "hydra/__init__.py",
  "content": "# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved\nfrom . import utils\nfrom .errors import MissingConfigException\nfrom .main import main\n\n# Source of truth for Hydra's version\n__version__ = \"0.10.0\"\n\n__all__ = [\"__version__\", \"MissingConfigException\", \"main\", \"utils\"]",
  "start_line": 1,
  "end_line": 9,
  "total_lines": 9,
  "is_truncated": false
}
Turn 15at 220 s60 tokens out12,081 prompt tokens
Wait, `initialize` and `compose` are not in `hydra/__init__.py`.
Where are they?
Let's search for `def initialize(`.
Turn 16at 220 s
call:run_command{command:<|"|>grep -rn "def initialize(" hydra/<|"|>}<tool_call|>
System instructions 124 characters
Please continue your work using the available tools, or call submit_patch when you have completed and verified your changes.
Turn 17at 225 s33 tokens out9,997 prompt tokens
TOOL CALL · run_command
{
  "command": "grep -rn \"def initialize\" /workspace/hydra/_internal/"
}
Result of run_command 127 characters
{
  "status": "error",
  "error_type": "CommandError",
  "error_message": "",
  "details": {
    "stdout": "",
    "stderr": "",
    "exit_code": 1
  }
}
Turn 18at 235 s119 tokens out10,081 prompt tokens
Okay, the `initialize` and `compose` functions are likely in `hydra/_internal/hydra.py` or something similar, or maybe they are exported from `hydra` but in my previous try I failed because of how they are structured. Wait, the `hydra/__init__.py` I read does not have `initialize`.

Let's check `hydra/_internal/hydra.py`.
TOOL CALL · run_command
{
  "command": "grep -rn \"def initialize\" hydra/_internal/hydra.py"
}
Result of run_command 127 characters
{
  "status": "error",
  "error_type": "CommandError",
  "error_message": "",
  "details": {
    "stdout": "",
    "stderr": "",
    "exit_code": 1
  }
}
Turn 19at 249 s235 tokens out10,256 prompt tokens
Wait, the problem description says `hydra.main.py` and `hydra.run(overrides=args.overrides)`.
Looking at `hydra/__init__.py` again:
```python
# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
from . import utils
from .errors import MissingConfigException
from .main import main

# Source of truth for Hydra's version
__version__ = "0.10.0"

__all__ = ["__version__", "MissingConfigException", "main", "utils"]
```
It seems `hydra` version 0.10.0 doesn't have `initialize` and `compose` at the top level in the same way as newer versions might, or maybe they are in `hydra` package but not exported in `__init__.py`.

Let's look at `hydra/main.py` and `hydra/_internal/hydra.py`.
TOOL CALL · read_file
{
  "filepath": "hydra/main.py"
}
Result of read_file 1,208 characters
{
  "status": "ok",
  "filepath": "hydra/main.py",
  "content": "# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved\nimport functools\nimport sys\nfrom ._internal.utils import run_hydra, get_args_parser\n\n\ndef main(config_path=\"\", strict=None):\n    \"\"\"\n    :param config_path: the config path, can be a directory in which it's used as the config root\n    or a file to load\n    :param strict: strict mode, will throw an error if command line overrides are not changing an\n    existing key or\n           if the code is accessing a non existent key\n    \"\"\"\n\n    def main_decorator(task_function):\n        @functools.wraps(task_function)\n        def decorated_main():\n            try:\n                run_hydra(\n                    args_parser=get_args_parser(),\n                    task_function=task_function,\n                    config_path=config_path,\n                    strict=strict,\n                )\n            except KeyboardInterrupt:\n                sys.exit(-1)\n            except SystemExit:\n                pass\n\n        return decorated_main\n\n    return main_decorator",
  "start_line": 1,
  "end_line": 33,
  "total_lines": 33,
  "is_truncated": false
}
Turn 20at 343 s1,645 tokens out10,834 prompt tokens
Okay, the problem description provided this traceback:
```
  File "app.py", line 9, in <module>
    app()
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/main.py", line 24, in decorated_main
    strict=strict,
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/utils.py", line 56, in run_hydra
    hydra.run(overrides=args.overrides)
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/hydra.py", line 103, in run
    cfg = self._load_config(overrides)
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/hydra.py", line 345, in _load_config
    cfg = self.config_loader.load_configuration(overrides)
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 56, in load_configuration
    cfg = self._merge_defaults(hydra_cfg, defaults, split_at)
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 395, in _merge_defaults
    cfg = merge_defaults(cfg, user_list)
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 374, in merge_defaults
    required=not is_optional,
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 301, in _merge_config
    raise MissingConfigException(msg, new_cfg, options)
```

I have already identified the bug in `hydra/_internal/config_loader.py`:
```python
    def _merge_defaults(self, cfg, defaults, split_at):
        def get_filename(config_name):
            filename, ext = os.path.splitext(config_name)
            if ext == "":
                ext = ".yaml"
            return "{}{}".format(filename, ext)
```
For `config_name = "0.1"`, `os.path.splitext("0.1")` returns `('0', '.1')`.
Since `ext` is `'.1'`, which is not `""`, `get_filename("0.1")` returns `"0.1"`.
But the file is named `"0.1.yaml"`.

If `config_name` is something like `"lr"`, `os.path.splitext("lr")` returns `('lr', '')`. Then `ext` becomes `.yaml` and it returns `"lr.yaml"`.

So if the user wants to use a file named `0.1.yaml`, they provide `lr=0.1`. `get_filename("0.1")` should return `0.1.yaml`.

The fix should be: if the original name doesn't end with `.yaml`, we should probably just add `.yaml` to it, or make sure we are not stripping away a part of the name that looks like an extension but isn't.

Actually, Hydra seems to expect that if the extension is missing, it should be `.yaml`.

If we change `get_filename` to:
```python
        def get_filename(config_name):
            if not config_name.endswith(".yaml"):
                return "{}.yaml".format(config_name)
            return config_name
```
Then `get_filename("0.1")` becomes `"0.1.yaml"`. `get_filename("my_config")` becomes `"my_config.yaml"`. `get_filename("my_config.yaml")` stays `"my_config.yaml"`.

Wait, what if the file is `.yml`? The current implementation only cares about `.yaml` in `get_group_options`:
```python
                        elif file_type == "file" and file.endswith(".yaml"):
                            files.append(file[0 : -len(".yaml")])
```
So Hydra (at least in this version) seems exclusively tied to `.yaml`.

Let's try to create a reproduction script that doesn't rely on `initialize` if I can't find it, but I can just use `hydra.main`.

Wait, `hydra.main` is a decorator. I can just write a small script.
TOOL CALL · run_command
{
  "command": "python3 - <<'PY'\nimport os\nimport shutil\nfrom hydra._internal.config_loader import ConfigLoader\nfrom omegaconf import OmegaConf\n\n# Setup configs\nos.makedirs(\"conf/lr\", exist_ok=True)\nwith open(\"conf/lr/0.1.yaml\", \"w\") as f:\n    f.write(\"lr: 0.1\")\nwith open(\"conf/lr/0.01.yaml\", \"w\") as f:\n    f.write(\"lr: 0.01\")\n\n# Mock SearchPath\nclass SearchPath:\n    def __init__(self, path, provider):\n        self.path = path\n        self.provider = provider\n\nclass MockConfigLoader(ConfigLoader):\n    def __init__(self):\n        self.config_search_path = type('SearchPathList', (), {'config_search_path': [SearchPath(\"conf\", \"fs\")]})\n        self.all_config_checked = []\n\nloader = MockConfigLoader()\n\n# The problematic function is _merge_defaults.\n# But _merge_defaults uses _merge_config which calls _load_config_impl.\n# Let's just test get_filename indirectly or directly by calling _merge_defaults if we can.\n# Actually, we can just test the logic of get_filename.\n\n# Since get_filename is local to _merge_defaults, I can't call it directly.\n# Let's just reproduce the crash.\n\n# We need a config that has a default.\ncfg = OmegaConf.create({\"defaults\": [{\"lr\": \"0.1\"}]})\n# Call _merge_defaults logic. Since it's an internal method, let's just call it.\n# _merge_defaults(self, cfg, defaults, split_at)\n# defaults is the list of defaults.\n\ntry:\n    # This should fail if the bug is present.\n    # defaults = [{\"lr\": \"0.1\"}]\n    # split_at = 0\n    loader._merge_defaults(cfg, [{\"lr\": \"0.1\"}], 0)\n    print(\"Successfully merged defaults!\")\nexcept Exception as e:\n    print(\"Caught expected error:\", e)\n    import traceback\n    traceback.print_exc()\nfinally:\n    shutil.rmtree(\"conf\")\nPY\n"
}
Result of run_command 709 characters
{
  "status": "ok",
  "stdout": "Caught expected error: Could not load lr/0.1, available options:\nlr:\n\t0.1\n\t0.01\n",
  "stderr": "Traceback (most recent call last):\n  File \"<stdin>\", line 44, in <module>\n  File \"/workspace/hydra/_internal/config_loader.py\", line 402, in _merge_defaults\n    cfg = merge_defaults(cfg, user_list)\n  File \"/workspace/hydra/_internal/config_loader.py\", line 381, in merge_defaults\n    required=not is_optional,\n  File \"/workspace/hydra/_internal/config_loader.py\", line 308, in _merge_config\n    raise MissingConfigException(msg, new_cfg, options)\nhydra.errors.MissingConfigException: Could not load lr/0.1, available options:\nlr:\n\t0.1\n\t0.01\n",
  "exit_code": 0
}
Turn 21at 376 s565 tokens out12,746 prompt tokens
reproduction successful! The error is `MissingConfigException: Could not load lr/0.1`.
This confirms that `get_filename("0.1")` returned `"0.1"`, and `_merge_config` then failed to find `lr/0.1`.

The fix is to change `get_filename` in `hydra/_internal/config_loader.py`.

Current implementation:
```python
        def get_filename(config_name):
            filename, ext = os.path.splitext(config_name)
            if ext == "":
                ext = ".yaml"
            return "{}{}".format(filename, ext)
```

Proposed implementation:
```python
        def get_filename(config_name):
            if not config_name.endswith(".yaml"):
                return "{}.yaml".format(config_name)
            return config_name
```

Wait, what if `config_name` is `my.config`?
Current: `os.path.splitext("my.config")` -> `('my', '.config')`. Returns `my.config`.
Proposed: `my.config.yaml`.

Is it possible that Hydra supports other extensions?
Looking at `get_group_options`:
```python
                        elif file_type == "file" and file.endswith(".yaml"):
                            files.append(file[0 : -len(".yaml")])
```
It only lists `.yaml` files.

What if `config_name` already ends with `.yaml`?
Current: `os.path.splitext("my.yaml")` -> `('my', '.yaml')`. Returns `my.yaml`.
Proposed: `my.yaml`.

What if `config_name` is `0.1`?
Current: `os.path.splitext("0.1")` -> `('0', '.1')`. Returns `0.1`.
Proposed: `0.1.yaml`.

The problem is exactly that `os.path.splitext` on a filename that is just a number (like `0.1`) thinks `.1` is the extension.

If I use `if not config_name.endswith(".yaml"):`, I'm assuming only `.yaml` is supported.

Let's check if there are any other extensions supported in the codebase.
TOOL CALL · run_command
{
  "command": "grep -rn \"\\.yaml\" hydra/_internal/config_loader.py | wc -l\ngrep -rn \"\\.yml\" hydra/_internal/config_loader.py | wc -l"
}
Result of run_command 66 characters
{
  "status": "ok",
  "stdout": "6\n0\n",
  "stderr": "",
  "exit_code": 0
}
Turn 22at 386 s189 tokens out13,355 prompt tokens
It seems only `.yaml` is used.

Wait, what if the user intentionally wants to use another extension?
The `get_group_options` explicitly filters for `.yaml`.

```python
                        elif file_type == "file" and file.endswith(".yaml"):
                            files.append(file[0 : -len(".yaml")])
```

So if the user has `my_config.yml`, Hydra won't even see it as an option.

So the fix of adding `.yaml` if it's not present seems correct and consistent with the rest of the `config_loader.py`.

Let's double check the `_merge_defaults` function again.
TOOL CALL · read_file
{
  "end_line": 375,
  "filepath": "hydra/_internal/config_loader.py",
  "start_line": 348
}
Result of read_file 1,583 characters
{
  "status": "ok",
  "filepath": "hydra/_internal/config_loader.py",
  "content": "                        module_name, resource_name\n                    )\n                )\n            # Uncomment to debug issues with configs not getting loaded.\n            # WARNING: breaks integration tests that relies on specified output from the process.\n            # print(\"_exists? {}, {} == {}\".format(module_name, resource_name, ret))\n            return ret\n        else:\n            return os.path.exists(filename)\n\n    def _merge_defaults(self, cfg, defaults, split_at):\n        def get_filename(config_name):\n            filename, ext = os.path.splitext(config_name)\n            if ext == \"\":\n                ext = \".yaml\"\n            return \"{}{}\".format(filename, ext)\n\n        def merge_defaults(merged_cfg, def_list):\n            cfg_with_list = OmegaConf.create(dict(defaults=def_list))\n            for default1 in cfg_with_list.defaults:\n                if isinstance(default1, DictConfig):\n                    is_optional = False\n                    if default1.optional is not None:\n                        is_optional = default1.optional\n                        del default1[\"optional\"]\n                    family = next(iter(default1.keys()))\n                    name = default1[family]\n                    # Name is none if default value is removed",
  "start_line": 348,
  "end_line": 375,
  "total_lines": 453,
  "is_truncated": false,
  "budget_warning": "Only 10 tool call(s) remaining (20/30 used). Finalize your edits and call submit_patch soon."
}
Turn 23at 392 s153 tokens out13,960 prompt tokens
I will apply the fix to `get_filename`.
TOOL CALL · edit_file
{
  "filepath": "hydra/_internal/config_loader.py",
  "new_string": "        def get_filename(config_name):\\n            if not config_name.endswith(\\\".yaml\\\"):\\n                return \\\"{}.yaml\\\".format(config_name)\\n            return config_name\\n",
  "old_string": "        def get_filename(config_name):\\n            filename, ext = os.path.splitext(config_name)\\n            if ext == \\\"\\\":\\n                ext = \\\".yaml\\\"\\n            return \\\"{}{}\\\".format(filename, ext)\\n"
}
Result of edit_file 906 characters
{
  "status": "ok",
  "filepath": "hydra/_internal/config_loader.py",
  "occurrences": 1,
  "strategy": "unescaped",
  "diff": "--- a/hydra/_internal/config_loader.py\n+++ b/hydra/_internal/config_loader.py\n@@ -357,10 +357,9 @@\n \n     def _merge_defaults(self, cfg, defaults, split_at):\n         def get_filename(config_name):\n-            filename, ext = os.path.splitext(config_name)\n-            if ext == \"\":\n-                ext = \".yaml\"\n-            return \"{}{}\".format(filename, ext)\n+            if not config_name.endswith(\".yaml\"):\n+                return \"{}.yaml\".format(config_name)\n+            return config_name\n \n         def merge_defaults(merged_cfg, def_list):\n             cfg_with_list = OmegaConf.create(dict(defaults=def_list))\n",
  "is_truncated": false,
  "budget_warning": "Only 9 tool call(s) remaining (21/30 used). Finalize your edits and call submit_patch soon."
}
Turn 24at 403 s366 tokens out14,414 prompt tokens
Now let's run the reproduction script again to verify the fix.
TOOL CALL · run_command
{
  "command": "python3 - <<'PY'\nimport os\nimport shutil\nfrom hydra._internal.config_loader import ConfigLoader\nfrom omegaconf import OmegaConf\n\n# Setup configs\nos.makedirs(\"conf/lr\", exist_ok=True)\nwith open(\"conf/lr/0.1.yaml\", \"w\") as f:\n    f.write(\"lr: 0.1\")\nwith open(\"conf/lr/0.01.yaml\", \"w\") as f:\n    f.write(\"lr: 0.01\")\n\n# Mock SearchPath\nclass SearchPath:\n    def __init__(self, path, provider):\n        self.path = path\n        self.provider = provider\n\nclass MockConfigLoader(ConfigLoader):\n    def __init__(self):\n        self.config_search_path = type('SearchPathList', (), {'config_search_path': [SearchPath(\"conf\", \"fs\")]})\n        self.all_config_checked = []\n\nloader = MockConfigLoader()\n\n# The problematic function is _merge_defaults.\ncfg = OmegaConf.create({\"defaults\": [{\"lr\": \"0.1\"}]})\n\ntry:\n    loader._merge_defaults(cfg, [{\"lr\": \"0.1\"}], 0)\n    print(\"Successfully merged defaults!\")\nexcept Exception as e:\n    print(\"Caught unexpected error:\", e)\n    import traceback\n    traceback.print_exc()\nfinally:\n    shutil.rmtree(\"conf\")\nPY\n"
}
Result of run_command 204 characters
{
  "status": "ok",
  "stdout": "Successfully merged defaults!\n",
  "stderr": "",
  "exit_code": 0,
  "budget_warning": "Only 8 tool call(s) remaining (22/30 used). Finalize your edits and call submit_patch soon."
}

Model calls (not matched to turns)

Generated tokens 433 tokens · stopped: STOP
The user is reporting a bug in `hydra` where YAML files with dots in their names (e.g., `0.1.yaml`) are not handled correctly, leading to a `MissingConfigException`.
The traceback points to `hydra/_internal/config_loader.py` and `_merge_config` method.

The user says: "When creating yaml file that has dot in the base name, `config_loader.py` erroneously misses the `.yaml` extension".

Let's analyze the provided traceback:
- `hydra/_internal/hydra.py` -> `_load_config` -> `config_loader.load_configuration`
- `hydra/_internal/config_loader.py` -> `load_configuration` -> `_merge_defaults` -> `merge_defaults` -> `_merge_config`
- `_merge_config` raises `MissingConfigException: Could not load lr/0.1, available options: lr: 0.01 0.1`

Wait, the available options listed are `0.01` and `0.1`. But it says "Could not load lr/0.1". This is weird. It's as if it's looking for `lr/0.1` without the extension and failing, even though `0.1` is one of the available options.

Wait, if the files are `0.1.yaml` and `0.01.yaml`, usually Hydra removes the extension when listing available options. So `0.1` and `0.01` are the correct names.

If it's trying to load `lr/0.1` and failing, maybe it's not appending `.yaml` correctly?

Let's examine `hydra/_internal/config_loader.py`.
<|channel>thought The user is reporting a bug in `hydra` where YAML files with dots in their names (e.g., `0.1.yaml`) are not handled correctly, leading to a `MissingConfigException`. The traceback points to `hydra/_internal/config_loader.py` and `_merge_config` method. The user says: "When creating yaml file that has dot in the base name, `config_loader.py` erroneously misses the `.yaml` extension". Let's analyze the provided traceback: - `hydra/_internal/hydra.py` -> `_load_config` -> `config_loader.load_configuration` - `hydra/_internal/config_loader.py` -> `load_configuration` -> `_merge_defaults` -> `merge_defaults` -> `_merge_config` - `_merge_config` raises `MissingConfigException: Could not load lr/0.1, available options: lr: 0.01 0.1` Wait, the available options listed are `0.01` and `0.1`. But it says "Could not load lr/0.1". This is weird. It's as if it's looking for `lr/0.1` without the extension and failing, even though `0.1` is one of the available options. Wait, if the files are `0.1.yaml` and `0.01.yaml`, usually Hydra removes the extension when listing available options. So `0.1` and `0.01` are the correct names. If it's trying to load `lr/0.1` and failing, maybe it's not appending `.yaml` correctly? Let's examine `hydra/_internal/config_loader.py`.<channel|><|tool_call>call:run_command{command:<|"|>grep -rn --include="*.py" "MissingConfigException" hydra/_internal/config_loader.py<|"|>}<tool_call|><|tool_response>
Generated tokens 94 tokens · stopped: STOP
The traceback said `hydra/_internal/config_loader.py`, line 301, in `_merge_config`.
Let's read `hydra/_internal/config_loader.py` around line 301.
The traceback said `hydra/_internal/config_loader.py`, line 301, in `_merge_config`. Let's read `hydra/_internal/config_loader.py` around line 301. <channel|><|tool_call>call:read_file{filepath:<|"|>hydra/_internal/config_loader.py<|"|>,end_line:350,start_line:250}<tool_call|><|tool_response>
Generated tokens 93 tokens · stopped: STOP
The `_merge_config` method calls `self._load_config_impl(new_cfg)`.
If `loaded_cfg` is `None`, it raises `MissingConfigException`.

Let's look at `_load_config_impl`.
The `_merge_config` method calls `self._load_config_impl(new_cfg)`. If `loaded_cfg` is `None`, it raises `MissingConfigException`. Let's look at `_load_config_impl`. <channel|><|tool_call>call:run_command{command:<|"|>grep -rn "def _load_config_impl" hydra/_internal/config_loader.py<|"|>}<tool_call|><|tool_response>
Generated tokens 54 tokens · stopped: STOP
Let's read `_load_config_impl`.

Let's read `_load_config_impl`. <channel|><|tool_call>call:read_file{end_line:230,filepath:<|"|>hydra/_internal/config_loader.py<|"|>,start_line:180}<tool_call|><|tool_response>
Generated tokens 69 tokens · stopped: STOP
`_load_config_impl` calls `self._find_config(input_file)`.
Let's look at `_find_config`.

`_load_config_impl` calls `self._find_config(input_file)`. Let's look at `_find_config`. <channel|><|tool_call>call:run_command{command:<|"|>grep -rn "def _find_config" hydra/_internal/config_loader.py<|"|>}<tool_call|><|tool_response>
Generated tokens 49 tokens · stopped: STOP
Reading `_find_config`.

Reading `_find_config`. <channel|><|tool_call>call:read_file{end_line:175,filepath:<|"|>hydra/_internal/config_loader.py<|"|>,start_line:110}<tool_call|><|tool_response>
Generated tokens 349 tokens · stopped: STOP
Wait, `_find_config` doesn't seem to add the `.yaml` extension.
It just checks if `config_file = "{}/{}".format(path, filepath)` exists using `self._exists(is_pkg, config_file)`.

If `filepath` is `lr/0.1`, and the file on disk is `lr/0.1.yaml`, then `_exists` will return `False` because it's looking for `lr/0.1` (without extension).

But Hydra is supposed to handle `.yaml` extensions. Let's see how it usually finds configs.
Wait, `OmegaConf.load` might handle extensions? No, `os.path.exists(fullpath)` is used in `_load_config_impl` for non-pkg paths.

If `filepath` is `lr/0.1`, then `fullpath` will be something like `conf/lr/0.1`. `os.path.exists('conf/lr/0.1')` will be `False` if the file is named `0.1.yaml`.

So the bug is that `_find_config` (or something before it) is not adding the `.yaml` extension if it's missing.

Wait, if I have a file `config.yaml`, and I tell Hydra to load `config`, it should find `config.yaml`.

Let's check `_exists`.
Wait, `_find_config` doesn't seem to add the `.yaml` extension. It just checks if `config_file = "{}/{}".format(path, filepath)` exists using `self._exists(is_pkg, config_file)`. If `filepath` is `lr/0.1`, and the file on disk is `lr/0.1.yaml`, then `_exists` will return `False` because it's looking for `lr/0.1` (without extension). But Hydra is supposed to handle `.yaml` extensions. Let's see how it usually finds configs. Wait, `OmegaConf.load` might handle extensions? No, `os.path.exists(fullpath)` is used in `_load_config_impl` for non-pkg paths. If `filepath` is `lr/0.1`, then `fullpath` will be something like `conf/lr/0.1`. `os.path.exists('conf/lr/0.1')` will be `False` if the file is named `0.1.yaml`. So the bug is that `_find_config` (or something before it) is not adding the `.yaml` extension if it's missing. Wait, if I have a file `config.yaml`, and I tell Hydra to load `config`, it should find `config.yaml`. Let's check `_exists`. <channel|><|tool_call>call:read_file{end_line:365,filepath:<|"|>hydra/_internal/config_loader.py<|"|>,start_line:340}<tool_call|><|tool_response>
Generated tokens 197 tokens · stopped: STOP
Wait! Look at line 353:
```python
    def _merge_defaults(self, cfg, defaults, split_at):
        def get_filename(config_name):
            filename, ext = os.path.splitext(config_name)
            if ext == "":
                ext = ".yaml"
            return "{}{}".format(filename, ext)
```
This `get_filename` helper function seems to do exactly what's needed: it adds `.yaml` if there's no extension.
However, this `get_filename` is defined INSIDE `_merge_defaults`. Is it used?

Let's see where `_merge_defaults` is defined and used.

Wait! Look at line 353: ```python def _merge_defaults(self, cfg, defaults, split_at): def get_filename(config_name): filename, ext = os.path.splitext(config_name) if ext == "": ext = ".yaml" return "{}{}".format(filename, ext) ``` This `get_filename` helper function seems to do exactly what's needed: it adds `.yaml` if there's no extension. However, this `get_filename` is defined INSIDE `_merge_defaults`. Is it used? Let's see where `_merge_defaults` is defined and used. <channel|><|tool_call>call:read_file{end_line:375,filepath:<|"|>hydra/_internal/config_loader.py<|"|>,start_line:348}<tool_call|><|tool_response>
Generated tokens 53 tokens · stopped: STOP
Let's read further into `merge_defaults`.


Let's read further into `merge_defaults`. <channel|><|tool_call>call:read_file{end_line:400,filepath:<|"|>hydra/_internal/config_loader.py<|"|>,start_line:376}<tool_call|><|tool_response>
Generated tokens 314 tokens · stopped: STOP
Ok, `merge_defaults` uses `get_filename(name)`.
And `get_filename` is:
```python
        def get_filename(config_name):
            filename, ext = os.path.splitext(config_name)
            if ext == "":
                ext = ".yaml"
            return "{}{}".format(filename, ext)
```
If `name` is `0.1`, `os.path.splitext("0.1")` returns `('0', '.1')`.
Wait! `os.path.splitext("0.1")` returns `('0', '.1')`!
Because `.1` is treated as the extension.
So `ext` is `.1`, and it's not `""`.
So `get_filename("0.1")` returns `"0.1"`.
But we wanted `0.1.yaml`.

That's the bug! `os.path.splitext` is not the right way to check if a Hydra config name has an extension, because Hydra config names can have dots in them and still not have a `.yaml` extension.

Hydra should probably check if the name ends with `.yaml`.

Let's verify this behavior with a quick script.
Ok, `merge_defaults` uses `get_filename(name)`. And `get_filename` is: ```python def get_filename(config_name): filename, ext = os.path.splitext(config_name) if ext == "": ext = ".yaml" return "{}{}".format(filename, ext) ``` If `name` is `0.1`, `os.path.splitext("0.1")` returns `('0', '.1')`. Wait! `os.path.splitext("0.1")` returns `('0', '.1')`! Because `.1` is treated as the extension. So `ext` is `.1`, and it's not `""`. So `get_filename("0.1")` returns `"0.1"`. But we wanted `0.1.yaml`. That's the bug! `os.path.splitext` is not the right way to check if a Hydra config name has an extension, because Hydra config names can have dots in them and still not have a `.yaml` extension. Hydra should probably check if the name ends with `.yaml`. Let's verify this behavior with a quick script. <channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY' import os print(os.path.splitext("0.1")) PY <|"|>}<tool_call|><|tool_response>
Generated tokens 684 tokens · stopped: STOP
Yes, `os.path.splitext("0.1")` is `('0', '.1')`.

So `get_filename` in `_merge_defaults` fails when the config name has a dot but no `.yaml` extension.

Wait, is `get_filename` used anywhere else?
It is defined inside `_merge_defaults`, so it's only used there.

Wait, the issue description says "Currently, I have to edit `config_loader.py` file to add the `.yaml` extension whenever it is missing."

If I change `get_filename` to:
```python
        def get_filename(config_name):
            if not config_name.endswith(".yaml"):
                return "{}.yaml".format(config_name)
            return config_name
```
This would fix the issue for `0.1`.

But wait, does Hydra support other extensions? The code currently only looks for `.yaml`.
Let's see if there are other extensions mentioned.
In `get_group_options` (which I saw earlier):
```python
                        elif file_type == "file" and file.endswith(".yaml"):
                            files.append(file[0 : -len(".yaml")])
```
It seems only `.yaml` is supported.

Wait, let's check if `OmegaConf` supports other extensions. `OmegaConf.load` supports YAML files.

Let's look at `_merge_defaults` again.

```python
    def _merge_defaults(self, cfg, defaults, split_at):
        def get_filename(config_name):
            filename, ext = os.path.splitext(config_name)
            if ext == "":
                ext = ".yaml"
            return "{}{}".format(filename, ext)
```

If the user provides `config.yaml`, `os.path.splitext("config.yaml")` is `('config', '.yaml')`. `ext` is `.yaml`. It returns `config.yaml`. Correct.
If the user provides `config`, `os.path.splitext("config")` is `('config', '')`. `ext` is `""`. It returns `config.yaml`. Correct.
If the user provides `0.1`, `os.path.splitext("0.1")` is `('0', '.1')`. `ext` is `.1`. It returns `0.1`. Incorrect.

So we should change it to:
```python
        def get_filename(config_name):
            if config_name.endswith(".yaml"):
                return config_name
            return "{}.yaml".format(config_name)
```

Wait, what if the file has another extension? Like `.yml`?
Hydra seems to only use `.yaml` based on the `get_group_options` code I read earlier.

Let's double check `get_group_options` again.

Yes, `os.path.splitext("0.1")` is `('0', '.1')`. So `get_filename` in `_merge_defaults` fails when the config name has a dot but no `.yaml` extension. Wait, is `get_filename` used anywhere else? It is defined inside `_merge_defaults`, so it's only used there. Wait, the issue description says "Currently, I have to edit `config_loader.py` file to add the `.yaml` extension whenever it is missing." If I change `get_filename` to: ```python def get_filename(config_name): if not config_name.endswith(".yaml"): return "{}.yaml".format(config_name) return config_name ``` This would fix the issue for `0.1`. But wait, does Hydra support other extensions? The code currently only looks for `.yaml`. Let's see if there are other extensions mentioned. In `get_group_options` (which I saw earlier): ```python elif file_type == "file" and file.endswith(".yaml"): files.append(file[0 : -len(".yaml")]) ``` It seems only `.yaml` is supported. Wait, let's check if `OmegaConf` supports other extensions. `OmegaConf.load` supports YAML files. Let's look at `_merge_defaults` again. ```python def _merge_defaults(self, cfg, defaults, split_at): def get_filename(config_name): filename, ext = os.path.splitext(config_name) if ext == "": ext = ".yaml" return "{}{}".format(filename, ext) ``` If the user provides `config.yaml`, `os.path.splitext("config.yaml")` is `('config', '.yaml')`. `ext` is `.yaml`. It returns `config.yaml`. Correct. If the user provides `config`, `os.path.splitext("config")` is `('config', '')`. `ext` is `""`. It returns `config.yaml`. Correct. If the user provides `0.1`, `os.path.splitext("0.1")` is `('0', '.1')`. `ext` is `.1`. It returns `0.1`. Incorrect. So we should change it to: ```python def get_filename(config_name): if config_name.endswith(".yaml"): return config_name return "{}.yaml".format(config_name) ``` Wait, what if the file has another extension? Like `.yml`? Hydra seems to only use `.yaml` based on the `get_group_options` code I read earlier. Let's double check `get_group_options` again. <channel|><|tool_call>call:read_file{end_line:250,filepath:<|"|>hydra/_internal/config_loader.py<|"|>,start_line:200}<tool_call|><|tool_response>
Generated tokens 56 tokens · stopped: STOP
I need to see the rest of `get_group_options`.

I need to see the rest of `get_group_options`. <channel|><|tool_call>call:read_file{end_line:300,filepath:<|"|>hydra/_internal/config_loader.py<|"|>,start_line:250}<tool_call|><|tool_response>
Generated tokens 369 tokens · stopped: STOP
Yes, it uses `file.endswith(".yaml")` and then `file[0 : -len(".yaml")]`.
So it's hard-coded for `.yaml`.

Now let's reproduce this.
I'll create a reproduction script that mimics the issue.

Yes, it uses `file.endswith(".yaml")` and then `file[0 : -len(".yaml")]`. So it's hard-coded for `.yaml`. Now let's reproduce this. I'll create a reproduction script that mimics the issue. <channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY' import os from hydra import initialize, compose from omegaconf import OmegaConf # Create a config directory structure os.makedirs("conf/lr", exist_ok=True) with open("conf/lr/0.1.yaml", "w") as f: f.write("lr: 0.1") with open("conf/lr/0.01.yaml", "w") as f: f.write("lr: 0.01") # Create a main config os.makedirs("conf", exist_ok=True) with open("conf/config.yaml", "w") as f: f.write("defaults:\n - lr: 0.1") try: # Initialize Hydra initialize(config_path="conf", version_base=None) # Compose the config. Using lr=0.1 explicitly to trigger the bug cfg = compose(overrides=["lr=0.1"]) print("Successfully loaded config:", OmegaConf.to_yaml(cfg)) except Exception as e: print("Error:", e) import traceback traceback.print_exc() finally: # Cleanup import shutil shutil.rmtree("conf") PY <|"|>}<tool_call|><|tool_response>
Generated tokens 79 tokens · stopped: STOP
Ah, I'm running the script from the root of the repo, and `hydra` is a package in the current directory.
Wait, `hydra/__init__.py` should export `initialize`.
Let's check `hydra/__init__.py`.

Ah, I'm running the script from the root of the repo, and `hydra` is a package in the current directory. Wait, `hydra/__init__.py` should export `initialize`. Let's check `hydra/__init__.py`. <channel|><|tool_call>call:read_file{filepath:<|"|>hydra/__init__.py<|"|>}<tool_call|><|tool_response>
Generated tokens 60 tokens · stopped: STOP
Wait, `initialize` and `compose` are not in `hydra/__init__.py`.
Where are they?
Let's search for `def initialize(`.


Wait, `initialize` and `compose` are not in `hydra/__init__.py`. Where are they? Let's search for `def initialize(`. <channel|>call:run_command{command:<|"|>grep -rn "def initialize(" hydra/<|"|>}<tool_call|><|tool_response>
Generated tokens 33 tokens · stopped: STOP
<|channel>thought <channel|><|tool_call>call:run_command{command:<|"|>grep -rn "def initialize" /workspace/hydra/_internal/<|"|>}<tool_call|><|tool_response>
Generated tokens 119 tokens · stopped: STOP
Okay, the `initialize` and `compose` functions are likely in `hydra/_internal/hydra.py` or something similar, or maybe they are exported from `hydra` but in my previous try I failed because of how they are structured. Wait, the `hydra/__init__.py` I read does not have `initialize`.

Let's check `hydra/_internal/hydra.py`.
Okay, the `initialize` and `compose` functions are likely in `hydra/_internal/hydra.py` or something similar, or maybe they are exported from `hydra` but in my previous try I failed because of how they are structured. Wait, the `hydra/__init__.py` I read does not have `initialize`. Let's check `hydra/_internal/hydra.py`.<channel|><|tool_call>call:run_command{command:<|"|>grep -rn "def initialize" hydra/_internal/hydra.py<|"|>}<tool_call|><|tool_response>
Generated tokens 235 tokens · stopped: STOP
Wait, the problem description says `hydra.main.py` and `hydra.run(overrides=args.overrides)`.
Looking at `hydra/__init__.py` again:
```python
# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
from . import utils
from .errors import MissingConfigException
from .main import main

# Source of truth for Hydra's version
__version__ = "0.10.0"

__all__ = ["__version__", "MissingConfigException", "main", "utils"]
```
It seems `hydra` version 0.10.0 doesn't have `initialize` and `compose` at the top level in the same way as newer versions might, or maybe they are in `hydra` package but not exported in `__init__.py`.

Let's look at `hydra/main.py` and `hydra/_internal/hydra.py`.
Wait, the problem description says `hydra.main.py` and `hydra.run(overrides=args.overrides)`. Looking at `hydra/__init__.py` again: ```python # Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved from . import utils from .errors import MissingConfigException from .main import main # Source of truth for Hydra's version __version__ = "0.10.0" __all__ = ["__version__", "MissingConfigException", "main", "utils"] ``` It seems `hydra` version 0.10.0 doesn't have `initialize` and `compose` at the top level in the same way as newer versions might, or maybe they are in `hydra` package but not exported in `__init__.py`. Let's look at `hydra/main.py` and `hydra/_internal/hydra.py`. <channel|><|tool_call>call:read_file{filepath:<|"|>hydra/main.py<|"|>}<tool_call|><|tool_response>
Generated tokens 1,645 tokens · stopped: STOP
Okay, the problem description provided this traceback:
```
  File "app.py", line 9, in <module>
    app()
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/main.py", line 24, in decorated_main
    strict=strict,
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/utils.py", line 56, in run_hydra
    hydra.run(overrides=args.overrides)
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/hydra.py", line 103, in run
    cfg = self._load_config(overrides)
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/hydra.py", line 345, in _load_config
    cfg = self.config_loader.load_configuration(overrides)
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 56, in load_configuration
    cfg = self._merge_defaults(hydra_cfg, defaults, split_at)
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 395, in _merge_defaults
    cfg = merge_defaults(cfg, user_list)
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 374, in merge_defaults
    required=not is_optional,
  File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 301, in _merge_config
    raise MissingConfigException(msg, new_cfg, options)
```

I have already identified the bug in `hydra/_internal/config_loader.py`:
```python
    def _merge_defaults(self, cfg, defaults, split_at):
        def get_filename(config_name):
            filename, ext = os.path.splitext(config_name)
            if ext == "":
                ext = ".yaml"
            return "{}{}".format(filename, ext)
```
For `config_name = "0.1"`, `os.path.splitext("0.1")` returns `('0', '.1')`.
Since `ext` is `'.1'`, which is not `""`, `get_filename("0.1")` returns `"0.1"`.
But the file is named `"0.1.yaml"`.

If `config_name` is something like `"lr"`, `os.path.splitext("lr")` returns `('lr', '')`. Then `ext` becomes `.yaml` and it returns `"lr.yaml"`.

So if the user wants to use a file named `0.1.yaml`, they provide `lr=0.1`. `get_filename("0.1")` should return `0.1.yaml`.

The fix should be: if the original name doesn't end with `.yaml`, we should probably just add `.yaml` to it, or make sure we are not stripping away a part of the name that looks like an extension but isn't.

Actually, Hydra seems to expect that if the extension is missing, it should be `.yaml`.

If we change `get_filename` to:
```python
        def get_filename(config_name):
            if not config_name.endswith(".yaml"):
                return "{}.yaml".format(config_name)
            return config_name
```
Then `get_filename("0.1")` becomes `"0.1.yaml"`. `get_filename("my_config")` becomes `"my_config.yaml"`. `get_filename("my_config.yaml")` stays `"my_config.yaml"`.

Wait, what if the file is `.yml`? The current implementation only cares about `.yaml` in `get_group_options`:
```python
                        elif file_type == "file" and file.endswith(".yaml"):
                            files.append(file[0 : -len(".yaml")])
```
So Hydra (at least in this version) seems exclusively tied to `.yaml`.

Let's try to create a reproduction script that doesn't rely on `initialize` if I can't find it, but I can just use `hydra.main`.

Wait, `hydra.main` is a decorator. I can just write a small script.

Okay, the problem description provided this traceback: ``` File "app.py", line 9, in <module> app() File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/main.py", line 24, in decorated_main strict=strict, File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/utils.py", line 56, in run_hydra hydra.run(overrides=args.overrides) File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/hydra.py", line 103, in run cfg = self._load_config(overrides) File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/hydra.py", line 345, in _load_config cfg = self.config_loader.load_configuration(overrides) File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 56, in load_configuration cfg = self._merge_defaults(hydra_cfg, defaults, split_at) File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 395, in _merge_defaults cfg = merge_defaults(cfg, user_list) File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 374, in merge_defaults required=not is_optional, File "/home/yjxiao/miniconda3/lib/python3.7/site-packages/hydra/_internal/config_loader.py", line 301, in _merge_config raise MissingConfigException(msg, new_cfg, options) ``` I have already identified the bug in `hydra/_internal/config_loader.py`: ```python def _merge_defaults(self, cfg, defaults, split_at): def get_filename(config_name): filename, ext = os.path.splitext(config_name) if ext == "": ext = ".yaml" return "{}{}".format(filename, ext) ``` For `config_name = "0.1"`, `os.path.splitext("0.1")` returns `('0', '.1')`. Since `ext` is `'.1'`, which is not `""`, `get_filename("0.1")` returns `"0.1"`. But the file is named `"0.1.yaml"`. If `config_name` is something like `"lr"`, `os.path.splitext("lr")` returns `('lr', '')`. Then `ext` becomes `.yaml` and it returns `"lr.yaml"`. So if the user wants to use a file named `0.1.yaml`, they provide `lr=0.1`. `get_filename("0.1")` should return `0.1.yaml`. The fix should be: if the original name doesn't end with `.yaml`, we should probably just add `.yaml` to it, or make sure we are not stripping away a part of the name that looks like an extension but isn't. Actually, Hydra seems to expect that if the extension is missing, it should be `.yaml`. If we change `get_filename` to: ```python def get_filename(config_name): if not config_name.endswith(".yaml"): return "{}.yaml".format(config_name) return config_name ``` Then `get_filename("0.1")` becomes `"0.1.yaml"`. `get_filename("my_config")` becomes `"my_config.yaml"`. `get_filename("my_config.yaml")` stays `"my_config.yaml"`. Wait, what if the file is `.yml`? The current implementation only cares about `.yaml` in `get_group_options`: ```python elif file_type == "file" and file.endswith(".yaml"): files.append(file[0 : -len(".yaml")]) ``` So Hydra (at least in this version) seems exclusively tied to `.yaml`. Let's try to create a reproduction script that doesn't rely on `initialize` if I can't find it, but I can just use `hydra.main`. Wait, `hydra.main` is a decorator. I can just write a small script. <channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY' import os import shutil from hydra._internal.config_loader import ConfigLoader from omegaconf import OmegaConf # Setup configs os.makedirs("conf/lr", exist_ok=True) with open("conf/lr/0.1.yaml", "w") as f: f.write("lr: 0.1") with open("conf/lr/0.01.yaml", "w") as f: f.write("lr: 0.01") # Mock SearchPath class SearchPath: def __init__(self, path, provider): self.path = path self.provider = provider class MockConfigLoader(ConfigLoader): def __init__(self): self.config_search_path = type('SearchPathList', (), {'config_search_path': [SearchPath("conf", "fs")]}) self.all_config_checked = [] loader = MockConfigLoader() # The problematic function is _merge_defaults. # But _merge_defaults uses _merge_config which calls _load_config_impl. # Let's just test get_filename indirectly or directly by calling _merge_defaults if we can. # Actually, we can just test the logic of get_filename. # Since get_filename is local to _merge_defaults, I can't call it directly. # Let's just reproduce the crash. # We need a config that has a default. cfg = OmegaConf.create({"defaults": [{"lr": "0.1"}]}) # Call _merge_defaults logic. Since it's an internal method, let's just call it. # _merge_defaults(self, cfg, defaults, split_at) # defaults is the list of defaults. try: # This should fail if the bug is present. # defaults = [{"lr": "0.1"}] # split_at = 0 loader._merge_defaults(cfg, [{"lr": "0.1"}], 0) print("Successfully merged defaults!") except Exception as e: print("Caught expected error:", e) import traceback traceback.print_exc() finally: shutil.rmtree("conf") PY <|"|>}<tool_call|><|tool_response>
Generated tokens 565 tokens · stopped: STOP
 reproduction successful! The error is `MissingConfigException: Could not load lr/0.1`.
This confirms that `get_filename("0.1")` returned `"0.1"`, and `_merge_config` then failed to find `lr/0.1`.

The fix is to change `get_filename` in `hydra/_internal/config_loader.py`.

Current implementation:
```python
        def get_filename(config_name):
            filename, ext = os.path.splitext(config_name)
            if ext == "":
                ext = ".yaml"
            return "{}{}".format(filename, ext)
```

Proposed implementation:
```python
        def get_filename(config_name):
            if not config_name.endswith(".yaml"):
                return "{}.yaml".format(config_name)
            return config_name
```

Wait, what if `config_name` is `my.config`?
Current: `os.path.splitext("my.config")` -> `('my', '.config')`. Returns `my.config`.
Proposed: `my.config.yaml`.

Is it possible that Hydra supports other extensions?
Looking at `get_group_options`:
```python
                        elif file_type == "file" and file.endswith(".yaml"):
                            files.append(file[0 : -len(".yaml")])
```
It only lists `.yaml` files.

What if `config_name` already ends with `.yaml`?
Current: `os.path.splitext("my.yaml")` -> `('my', '.yaml')`. Returns `my.yaml`.
Proposed: `my.yaml`.

What if `config_name` is `0.1`?
Current: `os.path.splitext("0.1")` -> `('0', '.1')`. Returns `0.1`.
Proposed: `0.1.yaml`.

The problem is exactly that `os.path.splitext` on a filename that is just a number (like `0.1`) thinks `.1` is the extension.

If I use `if not config_name.endswith(".yaml"):`, I'm assuming only `.yaml` is supported.

Let's check if there are any other extensions supported in the codebase.
reproduction successful! The error is `MissingConfigException: Could not load lr/0.1`. This confirms that `get_filename("0.1")` returned `"0.1"`, and `_merge_config` then failed to find `lr/0.1`. The fix is to change `get_filename` in `hydra/_internal/config_loader.py`. Current implementation: ```python def get_filename(config_name): filename, ext = os.path.splitext(config_name) if ext == "": ext = ".yaml" return "{}{}".format(filename, ext) ``` Proposed implementation: ```python def get_filename(config_name): if not config_name.endswith(".yaml"): return "{}.yaml".format(config_name) return config_name ``` Wait, what if `config_name` is `my.config`? Current: `os.path.splitext("my.config")` -> `('my', '.config')`. Returns `my.config`. Proposed: `my.config.yaml`. Is it possible that Hydra supports other extensions? Looking at `get_group_options`: ```python elif file_type == "file" and file.endswith(".yaml"): files.append(file[0 : -len(".yaml")]) ``` It only lists `.yaml` files. What if `config_name` already ends with `.yaml`? Current: `os.path.splitext("my.yaml")` -> `('my', '.yaml')`. Returns `my.yaml`. Proposed: `my.yaml`. What if `config_name` is `0.1`? Current: `os.path.splitext("0.1")` -> `('0', '.1')`. Returns `0.1`. Proposed: `0.1.yaml`. The problem is exactly that `os.path.splitext` on a filename that is just a number (like `0.1`) thinks `.1` is the extension. If I use `if not config_name.endswith(".yaml"):`, I'm assuming only `.yaml` is supported. Let's check if there are any other extensions supported in the codebase. <channel|><|tool_call>call:run_command{command:<|"|>grep -rn "\.yaml" hydra/_internal/config_loader.py | wc -l grep -rn "\.yml" hydra/_internal/config_loader.py | wc -l<|"|>}<tool_call|><|tool_response>
Generated tokens 189 tokens · stopped: STOP
It seems only `.yaml` is used.

Wait, what if the user intentionally wants to use another extension?
The `get_group_options` explicitly filters for `.yaml`.

```python
                        elif file_type == "file" and file.endswith(".yaml"):
                            files.append(file[0 : -len(".yaml")])
```

So if the user has `my_config.yml`, Hydra won't even see it as an option.

So the fix of adding `.yaml` if it's not present seems correct and consistent with the rest of the `config_loader.py`.

Let's double check the `_merge_defaults` function again.

It seems only `.yaml` is used. Wait, what if the user intentionally wants to use another extension? The `get_group_options` explicitly filters for `.yaml`. ```python elif file_type == "file" and file.endswith(".yaml"): files.append(file[0 : -len(".yaml")]) ``` So if the user has `my_config.yml`, Hydra won't even see it as an option. So the fix of adding `.yaml` if it's not present seems correct and consistent with the rest of the `config_loader.py`. Let's double check the `_merge_defaults` function again. <channel|><|tool_call>call:read_file{end_line:375,filepath:<|"|>hydra/_internal/config_loader.py<|"|>,start_line:348}<tool_call|><|tool_response>
Generated tokens 153 tokens · stopped: STOP
I will apply the fix to `get_filename`.

I will apply the fix to `get_filename`. <channel|><|tool_call>call:edit_file{filepath:<|"|>hydra/_internal/config_loader.py<|"|>,new_string:<|"|> def get_filename(config_name):\n if not config_name.endswith(\".yaml\"):\n return \"{}.yaml\".format(config_name)\n return config_name\n<|"|>,old_string:<|"|> def get_filename(config_name):\n filename, ext = os.path.splitext(config_name)\n if ext == \"\":\n ext = \".yaml\"\n return \"{}{}\".format(filename, ext)\n<|"|>}<tool_call|><|tool_response>
Generated tokens 366 tokens · stopped: STOP
Now let's run the reproduction script again to verify the fix.
Now let's run the reproduction script again to verify the fix. <channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY' import os import shutil from hydra._internal.config_loader import ConfigLoader from omegaconf import OmegaConf # Setup configs os.makedirs("conf/lr", exist_ok=True) with open("conf/lr/0.1.yaml", "w") as f: f.write("lr: 0.1") with open("conf/lr/0.01.yaml", "w") as f: f.write("lr: 0.01") # Mock SearchPath class SearchPath: def __init__(self, path, provider): self.path = path self.provider = provider class MockConfigLoader(ConfigLoader): def __init__(self): self.config_search_path = type('SearchPathList', (), {'config_search_path': [SearchPath("conf", "fs")]}) self.all_config_checked = [] loader = MockConfigLoader() # The problematic function is _merge_defaults. cfg = OmegaConf.create({"defaults": [{"lr": "0.1"}]}) try: loader._merge_defaults(cfg, [{"lr": "0.1"}], 0) print("Successfully merged defaults!") except Exception as e: print("Caught unexpected error:", e) import traceback traceback.print_exc() finally: shutil.rmtree("conf") PY <|"|>}<tool_call|><|tool_response>

Patch, tests and logs

Final code change Included
diff --git a/hydra/_internal/config_loader.py b/hydra/_internal/config_loader.py
index f023ef2..b2c6040 100644
--- a/hydra/_internal/config_loader.py
+++ b/hydra/_internal/config_loader.py
@@ -357,10 +357,9 @@ class ConfigLoader:
 
     def _merge_defaults(self, cfg, defaults, split_at):
         def get_filename(config_name):
-            filename, ext = os.path.splitext(config_name)
-            if ext == "":
-                ext = ".yaml"
-            return "{}{}".format(filename, ext)
+            if not config_name.endswith(".yaml"):
+                return "{}.yaml".format(config_name)
+            return config_name
 
         def merge_defaults(merged_cfg, def_list):
             cfg_with_list = OmegaConf.create(dict(defaults=def_list))
Test output Included
============================= test session starts ==============================
collected 50 items

tests/test_conf_loader.py ......................FF...................... [ 92%]
....                                                                     [100%]

=================================== FAILURES ===================================
/hydra/hydra/_internal/config_loader.py:299: hydra.errors.MissingConfigException: Could not load config.yml.yaml
/hydra/hydra/_internal/config_loader.py:299: hydra.errors.MissingConfigException: Could not load config.yml.yaml
==================================== PASSES ====================================
- generated xml file: /tmp/rebench-grade-4f1d56db636d4b17a492e71dea530b03.xml --
=========================== short test summary info ============================
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_configuration[hydra/test_utils/configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_configuration[pkg://hydra.test_utils.configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_with_missing_default[hydra/test_utils/configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_with_missing_default[pkg://hydra.test_utils.configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_with_missing_optional_default[hydra/test_utils/configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_with_missing_optional_default[pkg://hydra.test_utils.configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_with_optional_default[hydra/test_utils/configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_with_optional_default[pkg://hydra.test_utils.configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_changing_group_in_default[hydra/test_utils/configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_changing_group_in_default[pkg://hydra.test_utils.configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_adding_group_not_in_default[hydra/test_utils/configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_adding_group_not_in_default[pkg://hydra.test_utils.configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_change_run_dir_with_override[hydra/test_utils/configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_change_run_dir_with_override[pkg://hydra.test_utils.configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_change_run_dir_with_config[hydra/test_utils/configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_change_run_dir_with_config[pkg://hydra.test_utils.configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_strict[hydra/test_utils/configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_strict[pkg://hydra.test_utils.configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_history[hydra/test_utils/configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_history[pkg://hydra.test_utils.configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_history_with_basic_launcher[hydra/test_utils/configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_load_history_with_basic_launcher[pkg://hydra.test_utils.configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_override_with_equals[hydra/test_utils/configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_override_with_equals[pkg://hydra.test_utils.configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_compose_file_with_dot[hydra/test_utils/configs]
PASSED tests/test_conf_loader.py::TestConfigLoader::test_compose_file_with_dot[pkg://hydra.test_utils.configs]
PASSED tests/test_conf_loader.py::test_merge_default_lists[primary0-merged0-result0]
PASSED tests/test_conf_loader.py::test_merge_default_lists[primary1-merged1-result1]
PASSED tests/test_conf_loader.py::test_merge_default_lists[primary2-merged2-result2]
PASSED tests/test_conf_loader.py::test_merge_default_lists[primary3-merged3-result3]
PASSED tests/test_conf_loader.py::test_default_removal[removing-hydra-launcher-default.yaml-overrides0]
PASSED tests/test_conf_loader.py::test_default_removal[config.yaml-overrides1]
PASSED tests/test_conf_loader.py::test_default_removal[removing-hydra-launcher-default.yaml-overrides2]
PASSED tests/test_conf_loader.py::test_default_removal[config.yaml-overrides3]
PASSED tests/test_conf_loader.py::test_defaults_not_list_exception
PASSED tests/test_conf_loader.py::test_resource_exists[hydra.test_utils-]
PASSED tests/test_conf_loader.py::test_resource_exists[hydra.test_utils-__init__.py]
PASSED tests/test_conf_loader.py::test_resource_exists[hydra.test_utils-configs]
PASSED tests/test_conf_loader.py::test_resource_exists[hydra.test_utils-configs/config.yaml]
PASSED tests/test_conf_loader.py::test_resource_exists[hydra.test_utils.configs-]
PASSED tests/test_conf_loader.py::test_resource_exists[hydra.test_utils.configs-config.yaml]
PASSED tests/test_conf_loader.py::test_resource_exists[hydra.test_utils.configs-group1]
PASSED tests/test_conf_loader.py::test_resource_exists[hydra.test_utils.configs-group1/file1.yaml]
PASSED tests/test_conf_loader.py::test_override_hydra_config_value_from_config_file
PASSED tests/test_conf_loader.py::test_override_hydra_config_group_from_config_file
PASSED tests/test_conf_loader.py::test_list_groups
PASSED tests/test_conf_loader.py::test_non_config_group_default
PASSED tests/test_conf_loader.py::test_mixed_composition_order
FAILED tests/test_conf_loader.py::TestConfigLoader::test_load_yml_file[hydra/test_utils/configs]
FAILED tests/test_conf_loader.py::TestConfigLoader::test_load_yml_file[pkg://hydra.test_utils.configs]
========================= 2 failed, 48 passed in 1.11s =========================
Test errors Included
Test report (JUnit) Included
<?xml version="1.0" encoding="utf-8"?><testsuites><testsuite errors="0" failures="2" hostname="2446b9115071" name="pytest" skipped="0" tests="50" time="1.109" timestamp="2026-11-14T04:07:16.387625"><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_configuration[hydra/test_utils/configs]" time="0.031" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_configuration[pkg://hydra.test_utils.configs]" time="0.023" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_with_missing_default[hydra/test_utils/configs]" time="0.023" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_with_missing_default[pkg://hydra.test_utils.configs]" time="0.023" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_with_missing_optional_default[hydra/test_utils/configs]" time="0.024" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_with_missing_optional_default[pkg://hydra.test_utils.configs]" time="0.031" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_with_optional_default[hydra/test_utils/configs]" time="0.025" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_with_optional_default[pkg://hydra.test_utils.configs]" time="0.025" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_changing_group_in_default[hydra/test_utils/configs]" time="0.027" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_changing_group_in_default[pkg://hydra.test_utils.configs]" time="0.026" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_adding_group_not_in_default[hydra/test_utils/configs]" time="0.035" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_adding_group_not_in_default[pkg://hydra.test_utils.configs]" time="0.028" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_change_run_dir_with_override[hydra/test_utils/configs]" time="0.024" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_change_run_dir_with_override[pkg://hydra.test_utils.configs]" time="0.024" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_change_run_dir_with_config[hydra/test_utils/configs]" time="0.024" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_change_run_dir_with_config[pkg://hydra.test_utils.configs]" time="0.030" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_strict[hydra/test_utils/configs]" time="0.058" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_strict[pkg://hydra.test_utils.configs]" time="0.058" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_history[hydra/test_utils/configs]" time="0.031" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_history[pkg://hydra.test_utils.configs]" time="0.025" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_history_with_basic_launcher[hydra/test_utils/configs]" time="0.025" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_history_with_basic_launcher[pkg://hydra.test_utils.configs]" time="0.025" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_yml_file[hydra/test_utils/configs]" time="0.023"><failure message="hydra.errors.MissingConfigException: Could not load config.yml.yaml">E   hydra.errors.MissingConfigException: Could not load config.yml.yaml</failure></testcase><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_load_yml_file[pkg://hydra.test_utils.configs]" time="0.023"><failure message="hydra.errors.MissingConfigException: Could not load config.yml.yaml">E   hydra.errors.MissingConfigException: Could not load config.yml.yaml</failure></testcase><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_override_with_equals[hydra/test_utils/configs]" time="0.031" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_override_with_equals[pkg://hydra.test_utils.configs]" time="0.025" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_compose_file_with_dot[hydra/test_utils/configs]" time="0.030" /><testcase classname="tests.test_conf_loader.TestConfigLoader" name="test_compose_file_with_dot[pkg://hydra.test_utils.configs]" time="0.030" /><testcase classname="tests.test_conf_loader" name="test_merge_default_lists[primary0-merged0-result0]" time="0.000" /><testcase classname="tests.test_conf_loader" name="test_merge_default_lists[primary1-merged1-result1]" time="0.000" /><testcase classname="tests.test_conf_loader" name="test_merge_default_lists[primary2-merged2-result2]" time="0.000" /><testcase classname="tests.test_conf_loader" name="test_merge_default_lists[primary3-merged3-result3]" time="0.000" /><testcase classname="tests.test_conf_loader" name="test_default_removal[removing-hydra-launcher-default.yaml-overrides0]" time="0.028" /><testcase classname="tests.test_conf_loader" name="test_default_removal[config.yaml-overrides1]" time="0.023" /><testcase classname="tests.test_conf_loader" name="test_default_removal[removing-hydra-launcher-default.yaml-overrides2]" time="0.023" /><testcase classname="tests.test_conf_loader" name="test_default_removal[config.yaml-overrides3]" time="0.023" /><testcase classname="tests.test_conf_loader" name="test_defaults_not_list_exception" time="0.003" /><testcase classname="tests.test_conf_loader" name="test_resource_exists[hydra.test_utils-]" time="0.000" /><testcase classname="tests.test_conf_loader" name="test_resource_exists[hydra.test_utils-__init__.py]" time="0.000" /><testcase classname="tests.test_conf_loader" name="test_resource_exists[hydra.test_utils-configs]" time="0.000" /><testcase classname="tests.test_conf_loader" name="test_resource_exists[hydra.test_utils-configs/config.yaml]" time="0.000" /><testcase classname="tests.test_conf_loader" name="test_resource_exists[hydra.test_utils.configs-]" time="0.000" /><testcase classname="tests.test_conf_loader" name="test_resource_exists[hydra.test_utils.configs-config.yaml]" time="0.000" /><testcase classname="tests.test_conf_loader" name="test_resource_exists[hydra.test_utils.configs-group1]" time="0.000" /><testcase classname="tests.test_conf_loader" name="test_resource_exists[hydra.test_utils.configs-group1/file1.yaml]" time="0.000" /><testcase classname="tests.test_conf_loader" name="test_override_hydra_config_value_from_config_file" time="0.033" /><testcase classname="tests.test_conf_loader" name="test_override_hydra_config_group_from_config_file" time="0.021" /><testcase classname="tests.test_conf_loader" name="test_list_groups" time="0.001" /><testcase classname="tests.test_conf_loader" name="test_non_config_group_default" time="0.028" /><testcase classname="tests.test_conf_loader" name="test_mixed_composition_order" time="0.034" /></testsuite></testsuites>
Agent log Included
  [   0.0s] 📋 System Prompt: You are a principal Python software engineer resolving a repository issue in `/workspace`.
  [   0.0s] 🎯 Task Prompt: You are evaluating a software engineering task for repository facebookresearch/hydra.
  [  28.1s] 💭 (1274 chars) "The user is reporting a bug in `hydra` where YAML files with dots in their names (e.g., 
`0.1.yaml`) are not handled corr..."
  [  28.1s] 🔧 run_command grep -rn --include="*.py" "MissingConfigException" hydra/_internal/config_loader
  [  28.1s]   → 18:from ..errors import MissingConfigException
  [  34.2s] 💭 (147 chars) "The traceback said `hydra/_internal/config_loader.py`, line 301, in `_merge_config`.
Let's read `hydra/_internal/config_..."
  [  34.2s] 📖 read_file (hydra/_internal/config_loader.py)
  [  34.2s]   ✓ {'status': 'ok', 'filepath': 'hydra/_internal/config_loader.py', 'content': '                    
"{}/{}".format(path, gr…
  [  39.7s] 💭 (166 chars) "The `_merge_config` method calls `self._load_config_impl(new_cfg)`.
If `loaded_cfg` is `None`, it raises `MissingConfigE..."
  [  39.7s] 🔧 run_command grep -rn "def _load_config_impl" hydra/_internal/config_loader.py
  [  39.7s]   → 201:    def _load_config_impl(self, input_file, record_load=True):
  [  42.0s] 💭 (31 chars) "Let's read `_load_config_impl`."
  [  42.0s] 📖 read_file (hydra/_internal/config_loader.py)
  [  42.1s]   ✓ {'status': 'ok', 'filepath': 'hydra/_internal/config_loader.py', 'content': '            key1 = 
next(keys_iter)\n       …
  [  48.7s] 💭 (88 chars) "`_load_config_impl` calls `self._find_config(input_file)`.
Let's look at `_find_config`."
  [  48.7s] 🔧 run_command grep -rn "def _find_config" hydra/_internal/config_loader.py
  [  48.7s]   → 117:    def _find_config(self, filepath):
  [  53.6s] 💭 (23 chars) "Reading `_find_config`."
  [  53.6s] 📖 read_file (hydra/_internal/config_loader.py)
  [  53.7s]   ✓ {'status': 'ok', 'filepath': 'hydra/_internal/config_loader.py', 'content': '    def 
_split_path(path):\n        prefix …
  [  81.2s] 💭 (961 chars) "Wait, `_find_config` doesn't seem to add the `.yaml` extension.
It just checks if `config_file = "{}/{}".format(path, fi..."
  [  81.2s] 📖 read_file (hydra/_internal/config_loader.py)
  [  81.3s]   ✓ {'status': 'ok', 'filepath': 'hydra/_internal/config_loader.py', 'content': '                ret = 
resource_exists(modul…
  [  95.0s] 💭 (540 chars) "Wait! Look at line 353:
```python
    def _merge_defaults(self, cfg, defaults, split_at):
        def get_filename(confi..."
  [  95.0s] 📖 read_file (hydra/_internal/config_loader.py)
  [  95.1s]   ✓ {'status': 'ok', 'filepath': 'hydra/_internal/config_loader.py', 'content': '                        
module_name, resour…
  [  97.5s] 💭 (41 chars) "Let's read further into `merge_defaults`."
  [  97.5s] 📖 read_file (hydra/_internal/config_loader.py)
  [  97.5s]   ✓ {'status': 'ok', 'filepath': 'hydra/_internal/config_loader.py', 'content': '                    if name
is not None and…
  [ 120.7s] 💭 (861 chars) "Ok, `merge_defaults` uses `get_filename(name)`.
And `get_filename` is:
```python
        def get_filename(config_name):
..."
  [ 120.7s] 🔧 run_command (4 lines) python3 - <<'PY'
  [ 120.7s]   → ('0', '.1')
  [ 167.6s] 💭 (2248 chars) "Yes, `os.path.splitext("0.1")` is `('0', '.1')`.

So `get_filename` in `_merge_defaults` fails when the config name has ..."
  [ 167.6s] 📖 read_file (hydra/_internal/config_loader.py)
  [ 167.6s]   ✓ {'status': 'ok', 'filepath': 'hydra/_internal/config_loader.py', 'content': '\n    def 
_load_config_impl(self, input_fil…
  [ 170.8s] 💭 (46 chars) "I need to see the rest of `get_group_options`."
  [ 170.8s] 📖 read_file (hydra/_internal/config_loader.py)
  [ 170.8s]   ✓ {'status': 'ok', 'filepath': 'hydra/_internal/config_loader.py', 'content': '                    
"{}/{}".format(path, gr…
  [ 202.3s] 💭 (189 chars) "Yes, it uses `file.endswith(".yaml")` and then `file[0 : -len(".yaml")]`.
So it's hard-coded for `.yaml`.

Now let's rep..."
  [ 202.3s] 🔧 run_command (32 lines) python3 - <<'PY'
  [ 202.4s]   → error (exit 0): 
  [ 208.9s] 💭 (191 chars) "Ah, I'm running the script from the root of the repo, and `hydra` is a package in the 
current directory.
Wait, `hydra/__..."
  [ 208.9s] 📖 read_file (hydra/__init__.py)
  [ 209.0s]   ✓ {'status': 'ok', 'filepath': 'hydra/__init__.py', 'content': '# Copyright (c) Facebook, Inc. and its 
affiliates. All Rig…
  [ 214.2s] 💭 (116 chars) "Wait, `initialize` and `compose` are not in `hydra/__init__.py`.
Where are they?
Let's search for `def initialize(`."
  [ 214.2s] ✅ Agent finished: call:run_command{command:<|"|>grep -rn "def initialize(" hydra/<|"|>}<tool_call|>
  [ 214.2s] 🎯 Task Prompt: Please continue your work using the available tools, or call submit_patch when you have 
completed and verified your chan...
  [ 218.8s] 🔧 run_command grep -rn "def initialize" /workspace/hydra/_internal/
  [ 218.8s]   → error (exit 0): 
  [ 228.6s] 💭 (323 chars) "Okay, the `initialize` and `compose` functions are likely in `hydra/_internal/hydra.py` or 
something similar, or maybe t..."
  [ 228.6s] 🔧 run_command grep -rn "def initialize" hydra/_internal/hydra.py
  [ 228.6s]   → error (exit 0): 
  [ 243.3s] 💭 (699 chars) "Wait, the problem description says `hydra.main.py` and 
`hydra.run(overrides=args.overrides)`.
Looking at `hydra/__init__..."
  [ 243.3s] 📖 read_file (hydra/main.py)
  [ 243.4s]   ✓ {'status': 'ok', 'filepath': 'hydra/main.py', 'content': '# Copyright (c) Facebook, Inc. and its 
affiliates. All Rights …
  [ 337.0s] 💭 (3407 chars) "Okay, the problem description provided this traceback:
```
  File "app.py", line 9, in <module>
    app()
  File "/home/..."
  [ 337.0s] 🔧 run_command (53 lines) python3 - <<'PY'
  [ 337.1s]   → Caught expected error: Could not load lr/0.1, available options:
  [ 369.8s] 💭 (1721 chars) "reproduction successful! The error is `MissingConfigException: Could not load lr/0.1`.
This confirms that `get_filename(..."
  [ 369.8s] 🔧 run_command (2 lines) grep -rn "\.yaml" hydra/_internal/config_loader.py | wc -l
  [ 369.8s]   → 6
  [ 380.1s] 💭 (567 chars) "It seems only `.yaml` is used.

Wait, what if the user intentionally wants to use another extension?
The `get_group_opti..."
  [ 380.1s] 📖 read_file (hydra/_internal/config_loader.py)
  [ 380.2s]   ✓ {'status': 'ok', 'filepath': 'hydra/_internal/config_loader.py', 'content': '                        
module_name, resour…
  [ 386.0s] 💭 (39 chars) "I will apply the fix to `get_filename`."
  [ 386.0s] ✏️ edit_file (hydra/_internal/config_loader.py)
  [ 386.1s]   ✓ {'status': 'ok', 'filepath': 'hydra/_internal/config_loader.py', 'occurrences': 1, 'strategy': 
'unescaped', 'diff': '---…
  [ 397.3s] 💭 (62 chars) "Now let's run the reproduction script again to verify the fix."
  [ 397.3s] 🔧 run_command (39 lines) python3 - <<'PY'
  [ 397.4s]   → Successfully merged defaults!
Native result row
{
  "agent_error": "Agent exceeded session timeout (7.5 min)",
  "duration_seconds": 460.1,
  "error": "Test failures/errors recorded in JUnit XML (failures=2, errors=0)",
  "grade": {
    "collected_tests": 50,
    "competition_junit_ok": false,
    "error": "Test failures/errors recorded in JUnit XML (failures=2, errors=0)",
    "required_issues_count": 2,
    "resolved": false,
    "status_counts": {
      "FAILED": 2,
      "PASSED": 48
    },
    "strict_clean_patch": true,
    "test_exit_code": 1
  },
  "instance_id": "facebookresearch__hydra-273",
  "pass_idx": 0,
  "patch_chars": 756,
  "phase1_seconds": 458.36,
  "repo": "facebookresearch/hydra",
  "request_log_path": "/kaggle-root/working/r31/rollouts_X/requests/facebookresearch__hydra-273__p0__r7.jsonl",
  "resolved": false,
  "rollout_idx": 7,
  "run_key": "facebookresearch__hydra-273__p0__r7",
  "strict_clean_patch": true,
  "tool_calls": 22,
  "total_llm_calls": 23,
  "trace_path": "/kaggle-root/working/r31/rollouts_X/traces/trace_facebookresearch__hydra-273__p0__r7.json"
}