ROLLOUT 7 · Pyomo/pyomo
pyomo__pyomo-3017
Solved
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12tool calls
12model calls
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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 8,703 characters
You are evaluating a software engineering task for repository Pyomo/pyomo.
Problem Statement:
Pyomo AD fails with constant Expressions
## Summary
Pyomo AD raises an error when encountering `Expressions` with a constant value.
### Steps to reproduce the issue
```console
import pyomo.environ as pyo
from pyomo.core.expr.calculus.derivatives import Modes, differentiate
m = pyo.ConcreteModel()
m.x = pyo.Var(units=pyo.units.mol, initialize=0)
@m.Expression()
def y(blk):
return 2
@m.Expression()
def product(blk):
return blk.x * blk.y
diff_expr = differentiate(
expr=m.product,
wrt=m.x,
mode=Modes.reverse_symbolic
)
diff_expr.pprint()
```
### Error Message
```console
Exception has occurred: KeyError
"Component with id '1907001786672': 2.0"
File "C:\Users\[REDACTED]\Repos\pyomo\pyomo\common\collections\component_map.py", line 71, in __getitem__
return self._dict[id(obj)][1]
KeyError: 1907001786672
During handling of the above exception, another exception occurred:
File "C:\Users\[REDACTED]\Repos\pyomo\pyomo\common\collections\component_map.py", line 73, in __getitem__
raise KeyError("Component with id '%s': %s" % (id(obj), str(obj)))
File "C:\Users\[REDACTED]\Repos\pyomo\pyomo\core\expr\calculus\diff_with_pyomo.py", line 331, in _diff_GeneralExpression
der_dict[node.expr] += der_dict[node]
File "C:\Users\[REDACTED]\Repos\pyomo\pyomo\core\expr\calculus\diff_with_pyomo.py", line 442, in _reverse_diff_helper
_diff_GeneralExpression(e, val_dict, der_dict)
File "C:\Users\[REDACTED]\Repos\pyomo\pyomo\core\expr\calculus\diff_with_pyomo.py", line 484, in reverse_sd
return _reverse_diff_helper(expr, False)
File "C:\Users\[REDACTED]\Repos\pyomo\pyomo\core\expr\calculus\derivatives.py", line 96, in differentiate
res = reverse_sd(expr=expr)
File "C:\Users\[REDACTED]\Desktop\diff_expr.py", line 16, in <module>
diff_expr = differentiate(
KeyError: "Component with id '1907001786672': 2.0"
```
### Information on your system
Pyomo version: 6.6.2
Python version: 3.10.10 | packaged by Anaconda, Inc. | (main, Mar 21 2023, 18:39:17) [MSC v.1916 64 bit (AMD64)]
Operating system: Windows 10
How Pyomo was installed (PyPI, conda, source): From sources
Solver (if applicable): n/a
## 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):
```
./CHANGELOG.md
./CITATION.cff
./CONTRIBUTING.md
./LICENSE.md
./MANIFEST.in
./README.md
./RELEASE.md
./conftest.py
./doc
./doc/OnlineDocs
./doc/OnlineDocs/Makefile
./doc/OnlineDocs/README.md
./doc/OnlineDocs/_static
./doc/OnlineDocs/advanced_topics
./doc/OnlineDocs/bibliography.rst
./doc/OnlineDocs/citing_pyomo.rst
./doc/OnlineDocs/conf.py
./doc/OnlineDocs/contributed_packages
./doc/OnlineDocs/contribution_guide.rst
./doc/OnlineDocs/developer_reference
./doc/OnlineDocs/docutils.conf
./doc/OnlineDocs/errors.rst
./doc/OnlineDocs/index.rst
./doc/OnlineDocs/installation.rst
./doc/OnlineDocs/library_reference
./doc/OnlineDocs/make.bat
./doc/OnlineDocs/model_debugging
./doc/OnlineDocs/model_transformations
./doc/OnlineDocs/modeling_extensions
./doc/OnlineDocs/pyomo_modeling_components
./doc/OnlineDocs/pyomo_overview
./doc/OnlineDocs/related_packages.rst
./doc/OnlineDocs/solving_pyomo_models.rst
./doc/OnlineDocs/tests
./doc/OnlineDocs/tutorial_examples.rst
./doc/OnlineDocs/working_abstractmodels
./doc/OnlineDocs/working_models.rst
./doc/logos
./doc/logos/coopr
./doc/logos/dae
./doc/logos/doe
./doc/logos/gdp
./doc/logos/pyomo
./doc/logos/pysp
./examples
./pyomo
./pyomo/__init__.py
./pyomo/common
./pyomo/common/README.md
./pyomo/common/__init__.py
./pyomo/common/_command.py
./pyomo/common/_common.py
./pyomo/common/autoslots.py
./pyomo/common/backports.py
./pyomo/common/cmake_builder.py
./pyomo/common/collections
./pyomo/common/config.py
./pyomo/common/dependencies.py
./pyomo/common/deprecation.py
./pyomo/common/download.py
./pyomo/common/env.py
./pyomo/common/envvar.py
./pyomo/common/errors.py
./pyomo/common/extensions.py
./pyomo/common/factory.py
./pyomo/common/fileutils.py
./pyomo/common/formatting.py
./pyomo/common/gc_manager.py
./pyomo/common/getGSL.py
./pyomo/common/gsl.py
./pyomo/common/log.py
./pyomo/common/modeling.py
./pyomo/common/multithread.py
./pyomo/common/numeric_types.py
./pyomo/common/plugin.py
./pyomo/common/plugin_base.py
./pyomo/common/plugins.py
./pyomo/common/pyomo_typing.py
./pyomo/common/shutdown.py
./pyomo/common/sorting.py
./pyomo/common/tee.py
./pyomo/common/tempfiles.py
./pyomo/common/tests
./pyomo/common/timing.py
./pyomo/common/unittest.py
./pyomo/contrib
./pyomo/contrib/README.txt
./pyomo/contrib/__init__.py
./pyomo/contrib/ampl_function_demo
./pyomo/contrib/appsi
./pyomo/contrib/benders
./pyomo/contrib/community_detection
./pyomo/contrib/cp
./pyomo/contrib/doe
./pyomo/contrib/example
./pyomo/contrib/fbbt
./pyomo/contrib/fme
./pyomo/contrib/gdp_bounds
./pyomo/contrib/gdpopt
./pyomo/contrib/gjh
./pyomo/contrib/iis
./pyomo/contrib/incidence_analysis
./pyomo/contrib/interior_point
./pyomo/contrib/mcpp
./pyomo/contrib/mindtpy
./pyomo/contrib/mpc
./pyomo/contrib/multistart
./pyomo/contrib/parmest
./pyomo/contrib/piecewise
./pyomo/contrib/preprocessing
./pyomo/contrib/pynumero
./pyomo/contrib/pyros
./pyomo/contrib/satsolver
./pyomo/contrib/sensitivity_toolbox
./pyomo/contrib/simplemodel
./pyomo/contrib/trustregion
./pyomo/contrib/viewer
./pyomo/core
./pyomo/core/__init__.py
./pyomo/core/base
./pyomo/core/beta
./pyomo/core/expr
./pyomo/core/kernel
./pyomo/core/plugins
./pyomo/core/pyomoobject.py
./pyomo/core/staleflag.py
./pyomo/core/tests
./pyomo/core/util.py
./pyomo/dae
./pyomo/dae/__init__.py
./pyomo/dae/contset.py
./pyomo/dae/diffvar.py
./pyomo/dae/flatten.py
./pyomo/dae/initialization.py
./pyomo/dae/integral.py
./pyomo/dae/misc.py
./pyomo/dae/plugins
./pyomo/dae/set_utils.py
./pyomo/dae/simulator.py
./pyomo/dae/tests
./pyomo/dae/utilities.py
./pyomo/dataportal
./pyomo/dataportal/DataPortal.py
./pyomo/dataportal/TableData.py
./pyomo/dataportal/__init__.py
./pyomo/dataportal/factory.py
./pyomo/dataportal/parse_datacmds.py
./pyomo/dataportal/plugins
./pyomo/dataportal/process_data.py
./pyomo/dataportal/tester
./pyomo/dataportal/tests
./pyomo/duality
./pyomo/duality/__init__.py
./pyomo/duality/collect.py
./pyomo/duality/lagrangian_dual.py
./pyomo/duality/plugins.py
./pyomo/duality/tests
./pyomo/environ
./pyomo/environ/__init__.py
./pyomo/environ/tests
./pyomo/gdp
./pyomo/gdp/__init__.py
./pyomo/gdp/basic_step.py
./pyomo/gdp/disjunct.py
./pyomo/gdp/plugins
./pyomo/gdp/tests
./pyomo/gdp/transformed_disjunct.py
./pyomo/gdp/util.py
./pyomo/kernel
./pyomo/kernel/__init__.py
./pyomo/kernel/util.py
./pyomo/mpec
./pyomo/mpec/__init__.py
./pyomo/mpec/complementarity.py
./pyomo/mpec/plugins
./pyomo/mpec/tests
./pyomo/neos
./pyomo/neos/__init__.py
./pyomo/neos/kestrel.py
./pyomo/neos/plugins
./pyomo/neos/tests
./pyomo/network
./pyomo/network/__init__.py
./pyomo/network/arc.py
./pyomo/network/decomposition.py
./pyomo/network/foqus_graph.py
./pyomo/network/plugins
./pyomo/opt
./pyomo/pysp
./pyomo/repn
./pyomo/scripting
./pyomo/solvers
./pyomo/util
./pyomo/version
./scripts
./scripts/get_pyomo.py
./scripts/get_pyomo_extras.py
./scripts/performance
./setup.cfg
./setup.py
```
Turn 1at 35 s538 tokens out5,133 prompt tokens
The user is reporting a `KeyError` when using Pyomo AD (`differentiate`) with `Expression` components that have constant values.
The error occurs in `pyomo/core/expr/calculus/diff_with_pyomo.py` in `_diff_GeneralExpression`.
The traceback shows:
`File "C:\Users\[REDACTED]\Repos\pyomo\pyomo\core\expr\calculus\diff_with_pyomo.py", line 331, in _diff_GeneralExpression`
`der_dict[node.expr] += der_dict[node]`
And the `KeyError` comes from `pyomo/common/collections/component_map.py`, which seems to be used by `der_dict` (likely a `ComponentMap`).
The reproduction script provided is:
```python
import pyomo.environ as pyo
from pyomo.core.expr.calculus.derivatives import Modes, differentiate
m = pyo.ConcreteModel()
m.x = pyo.Var(units=pyo.units.mol, initialize=0)
@m.Expression()
def y(blk):
return 2
@m.Expression()
def product(blk):
return blk.x * blk.y
diff_expr = differentiate(
expr=m.product,
wrt=m.x,
mode=Modes.reverse_symbolic
)
diff_expr.pprint()
```
Let's try to reproduce this bug first.
TOOL CALL · run_command
{
"command": "python3 - <<'PY'\nimport pyomo.environ as pyo\nfrom pyomo.core.expr.calculus.derivatives import Modes, differentiate\n\nm = pyo.ConcreteModel()\n\nm.x = pyo.Var(units=pyo.units.mol, initialize=0)\n\n@m.Expression()\ndef y(blk):\n return 2\n\n@m.Expression()\ndef product(blk):\n return blk.x * blk.y\n\ntry:\n diff_expr = differentiate(\n expr=m.product,\n wrt=m.x,\n mode=Modes.reverse_symbolic\n )\n diff_expr.pprint()\nexcept Exception as e:\n import traceback\n traceback.print_exc()\nPY\n"
}Result of run_command 1,199 characters
{
"status": "error",
"error_type": "CommandError",
"error_message": "Traceback (most recent call last):\n File \"<stdin>\", line 6, in <module>\n File \"/workspace/pyomo/core/base/units_container.py\", line 1532, in __getattribute__\n return getattr(pint_module, attr)\n File \"/workspace/pyomo/common/dependencies.py\", line 75, in __getattr__\n raise DeferredImportError(self._moduleunavailable_message())\npyomo.common.errors.DeferredImportError: The \"pint\" package failed to import. This package is necessary to use Pyomo units. (import raised ModuleNotFoundError: No module named 'pint')\n",
"details": {
"stdout": "",
"stderr": "Traceback (most recent call last):\n File \"<stdin>\", line 6, in <module>\n File \"/workspace/pyomo/core/base/units_container.py\", line 1532, in __getattribute__\n return getattr(pint_module, attr)\n File \"/workspace/pyomo/common/dependencies.py\", line 75, in __getattr__\n raise DeferredImportError(self._moduleunavailable_message())\npyomo.common.errors.DeferredImportError: The \"pint\" package failed to import. This package is necessary to use Pyomo units. (import raised ModuleNotFoundError: No module named 'pint')\n",
"exit_code": 1
}
}Generated tokens 538 tokens · stopped: STOP
<|channel>thought
The user is reporting a `KeyError` when using Pyomo AD (`differentiate`) with `Expression` components that have constant values.
The error occurs in `pyomo/core/expr/calculus/diff_with_pyomo.py` in `_diff_GeneralExpression`.
The traceback shows:
`File "C:\Users\[REDACTED]\Repos\pyomo\pyomo\core\expr\calculus\diff_with_pyomo.py", line 331, in _diff_GeneralExpression`
`der_dict[node.expr] += der_dict[node]`
And the `KeyError` comes from `pyomo/common/collections/component_map.py`, which seems to be used by `der_dict` (likely a `ComponentMap`).
The reproduction script provided is:
```python
import pyomo.environ as pyo
from pyomo.core.expr.calculus.derivatives import Modes, differentiate
m = pyo.ConcreteModel()
m.x = pyo.Var(units=pyo.units.mol, initialize=0)
@m.Expression()
def y(blk):
return 2
@m.Expression()
def product(blk):
return blk.x * blk.y
diff_expr = differentiate(
expr=m.product,
wrt=m.x,
mode=Modes.reverse_symbolic
)
diff_expr.pprint()
```
Let's try to reproduce this bug first.<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY'
import pyomo.environ as pyo
from pyomo.core.expr.calculus.derivatives import Modes, differentiate
m = pyo.ConcreteModel()
m.x = pyo.Var(units=pyo.units.mol, initialize=0)
@m.Expression()
def y(blk):
return 2
@m.Expression()
def product(blk):
return blk.x * blk.y
try:
diff_expr = differentiate(
expr=m.product,
wrt=m.x,
mode=Modes.reverse_symbolic
)
diff_expr.pprint()
except Exception as e:
import traceback
traceback.print_exc()
PY
<|"|>}<tool_call|><|tool_response>
Turn 2at 44 s231 tokens out6,035 prompt tokens
The reproduction failed because `pint` is not installed, and the reproduction script uses `units=pyo.units.mol`. I should remove the `units` argument from `pyo.Var` to avoid this.
TOOL CALL · run_command
{
"command": "python3 - <<'PY'\nimport pyomo.environ as pyo\nfrom pyomo.core.expr.calculus.derivatives import Modes, differentiate\n\nm = pyo.ConcreteModel()\n\nm.x = pyo.Var(initialize=0)\n\n@m.Expression()\ndef y(blk):\n return 2\n\n@m.Expression()\ndef product(blk):\n return blk.x * blk.y\n\ntry:\n diff_expr = differentiate(\n expr=m.product,\n wrt=m.x,\n mode=Modes.reverse_symbolic\n )\n diff_expr.pprint()\nexcept Exception as e:\n import traceback\n traceback.print_exc()\nPY\n"
}Result of run_command 1,182 characters
{
"status": "ok",
"stdout": "",
"stderr": "Traceback (most recent call last):\n File \"/workspace/pyomo/common/collections/component_map.py\", line 71, in __getitem__\n return self._dict[id(obj)][1]\nKeyError: 129418845037200\n\nDuring handling of the above exception, another exception occurred:\n\nTraceback (most recent call last):\n File \"<stdin>\", line 17, in <module>\n File \"/workspace/pyomo/core/expr/calculus/derivatives.py\", line 96, in differentiate\n res = reverse_sd(expr=expr)\n File \"/workspace/pyomo/core/expr/calculus/diff_with_pyomo.py\", line 484, in reverse_sd\n return _reverse_diff_helper(expr, False)\n File \"/workspace/pyomo/core/expr/calculus/diff_with_pyomo.py\", line 442, in _reverse_diff_helper\n _diff_GeneralExpression(e, val_dict, der_dict)\n File \"/workspace/pyomo/core/expr/calculus/diff_with_pyomo.py\", line 331, in _diff_GeneralExpression\n der_dict[node.expr] += der_dict[node]\n File \"/workspace/pyomo/common/collections/component_map.py\", line 73, in __getitem__\n raise KeyError(\"Component with id '%s': %s\" % (id(obj), str(obj)))\nKeyError: \"Component with id '129418845037200': 2.0\"\n",
"exit_code": 0
}Generated tokens 231 tokens · stopped: STOP
The reproduction failed because `pint` is not installed, and the reproduction script uses `units=pyo.units.mol`. I should remove the `units` argument from `pyo.Var` to avoid this.
<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY'
import pyomo.environ as pyo
from pyomo.core.expr.calculus.derivatives import Modes, differentiate
m = pyo.ConcreteModel()
m.x = pyo.Var(initialize=0)
@m.Expression()
def y(blk):
return 2
@m.Expression()
def product(blk):
return blk.x * blk.y
try:
diff_expr = differentiate(
expr=m.product,
wrt=m.x,
mode=Modes.reverse_symbolic
)
diff_expr.pprint()
except Exception as e:
import traceback
traceback.print_exc()
PY
<|"|>}<tool_call|><|tool_response>
Turn 3at 57 s206 tokens out6,712 prompt tokens
The bug is reproduced. The problematic line is `der_dict[node.expr] += der_dict[node]` in `pyomo/core/expr/calculus/diff_with_pyomo.py`. The `KeyError` occurs when `node.expr` (or `node`) is a constant (like `2.0`). The `der_dict` seems to be a `ComponentMap` (based on the traceback), and `ComponentMap` likely expects objects that are Pyomo components or have a certain ID, and maybe it doesn't handle constants well. Let's examine `pyomo/core/expr/calculus/diff_with_pyomo.py` around line 331.
TOOL CALL · read_file
{
"end_line": 350,
"filepath": "pyomo/core/expr/calculus/diff_with_pyomo.py",
"start_line": 310
}Result of read_file 1,286 characters
{
"status": "ok",
"filepath": "pyomo/core/expr/calculus/diff_with_pyomo.py",
"content": " val_dict: ComponentMap\n der_dict: ComponentMap\n \"\"\"\n if node.getname() in _unary_map:\n _unary_map[node.getname()](node, val_dict, der_dict)\n else:\n raise DifferentiationException(\n 'Unsupported expression type for differentiation: {0}'.format(type(node))\n )\n\n\ndef _diff_GeneralExpression(node, val_dict, der_dict):\n \"\"\"\n Reverse automatic differentiation for named expressions.\n\n Parameters\n ----------\n node: The named expression\n val_dict: ComponentMap\n der_dict: ComponentMap\n \"\"\"\n der_dict[node.expr] += der_dict[node]\n\n\ndef _diff_ExternalFunctionExpression(node, val_dict, der_dict):\n \"\"\"\n\n Parameters\n ----------\n node: pyomo.core.expr.numeric_expr.ExternalFunctionExpression\n val_dict: ComponentMap\n der_dict: ComponentMap\n \"\"\"\n der = der_dict[node]\n vals = tuple(val_dict[i] for i in node.args)\n derivs = node._fcn.evaluate_fgh(vals, fgh=1)[1]\n for ndx, arg in enumerate(node.args):\n der_dict[arg] += der * derivs[ndx]\n\n\n_diff_map = dict()",
"start_line": 310,
"end_line": 350,
"total_lines": 484,
"is_truncated": false
}Generated tokens 206 tokens · stopped: STOP
The bug is reproduced. The problematic line is `der_dict[node.expr] += der_dict[node]` in `pyomo/core/expr/calculus/diff_with_pyomo.py`.
The `KeyError` occurs when `node.expr` (or `node`) is a constant (like `2.0`).
The `der_dict` seems to be a `ComponentMap` (based on the traceback), and `ComponentMap` likely expects objects that are Pyomo components or have a certain ID, and maybe it doesn't handle constants well.
Let's examine `pyomo/core/expr/calculus/diff_with_pyomo.py` around line 331.
<channel|><|tool_call>call:read_file{end_line:350,filepath:<|"|>pyomo/core/expr/calculus/diff_with_pyomo.py<|"|>,start_line:310}<tool_call|><|tool_response>
Turn 4at 92 s503 tokens out7,361 prompt tokens
The function `_diff_GeneralExpression` is:
```python
def _diff_GeneralExpression(node, val_dict, der_dict):
"""
Reverse automatic differentiation for named expressions.
Parameters
----------
node: The named expression
val_dict: ComponentMap
der_dict: ComponentMap
"""
der_dict[node.expr] += der_dict[node]
```
`node` is a named expression (an `Expression` component). `node.expr` is the expression it represents.
In the reproduction case:
`m.y` is an `Expression` with value `2`.
`m.product` is `m.x * m.y`.
When differentiating `m.product` with respect to `m.x` using reverse mode:
`m.product` is the root. its derivative is 1.
`m.product` is a product of `m.x` and `m.y`.
The derivative of `m.product` wrt `m.x` is `m.y`.
The derivative of `m.product` wrt `m.y` is `m.x`.
So `der_dict[m.x]` will get `der_dict[m.product] * m.y`.
`der_dict[m.y]` will get `der_dict[m.product] * m.x`.
Now we reach `_diff_GeneralExpression` for `node = m.y`.
`node.expr` is `2.0`.
`der_dict[node]` is the accumulated derivative wrt `m.y`.
The line `der_dict[node.expr] += der_dict[node]` attempts to add this derivative to `der_dict[2.0]`.
Since `2.0` is a constant and not a component, `ComponentMap.__getitem__` (or `__setitem__`) might be failing.
Wait, let's check `pyomo/common/collections/component_map.py` to see why it fails for constants.
TOOL CALL · read_file
{
"end_line": 80,
"filepath": "pyomo/common/collections/component_map.py",
"start_line": 60
}Result of read_file 817 characters
{
"status": "ok",
"filepath": "pyomo/common/collections/component_map.py",
"content": " def __str__(self):\n \"\"\"String representation of the mapping.\"\"\"\n tmp = {str(c) + \" (id=\" + str(id(c)) + \")\": v for c, v in self.items()}\n return \"ComponentMap(\" + str(tmp) + \")\"\n\n #\n # Implement MutableMapping abstract methods\n #\n\n def __getitem__(self, obj):\n try:\n return self._dict[id(obj)][1]\n except KeyError:\n raise KeyError(\"Component with id '%s': %s\" % (id(obj), str(obj)))\n\n def __setitem__(self, obj, val):\n self._dict[id(obj)] = (obj, val)\n\n def __delitem__(self, obj):\n try:\n del self._dict[id(obj)]",
"start_line": 60,
"end_line": 80,
"total_lines": 135,
"is_truncated": false
}Generated tokens 503 tokens · stopped: STOP
The function `_diff_GeneralExpression` is:
```python
def _diff_GeneralExpression(node, val_dict, der_dict):
"""
Reverse automatic differentiation for named expressions.
Parameters
----------
node: The named expression
val_dict: ComponentMap
der_dict: ComponentMap
"""
der_dict[node.expr] += der_dict[node]
```
`node` is a named expression (an `Expression` component). `node.expr` is the expression it represents.
In the reproduction case:
`m.y` is an `Expression` with value `2`.
`m.product` is `m.x * m.y`.
When differentiating `m.product` with respect to `m.x` using reverse mode:
`m.product` is the root. its derivative is 1.
`m.product` is a product of `m.x` and `m.y`.
The derivative of `m.product` wrt `m.x` is `m.y`.
The derivative of `m.product` wrt `m.y` is `m.x`.
So `der_dict[m.x]` will get `der_dict[m.product] * m.y`.
`der_dict[m.y]` will get `der_dict[m.product] * m.x`.
Now we reach `_diff_GeneralExpression` for `node = m.y`.
`node.expr` is `2.0`.
`der_dict[node]` is the accumulated derivative wrt `m.y`.
The line `der_dict[node.expr] += der_dict[node]` attempts to add this derivative to `der_dict[2.0]`.
Since `2.0` is a constant and not a component, `ComponentMap.__getitem__` (or `__setitem__`) might be failing.
Wait, let's check `pyomo/common/collections/component_map.py` to see why it fails for constants.
<channel|><|tool_call>call:read_file{end_line:80,filepath:<|"|>pyomo/common/collections/component_map.py<|"|>,start_line:60}<tool_call|><|tool_response>
Turn 5at 142 s878 tokens out8,152 prompt tokens
`ComponentMap` uses `id(obj)` as keys in `self._dict`. In `_diff_GeneralExpression`, `der_dict[node.expr] += der_dict[node]` This is equivalent to: `der_dict[node.expr] = der_dict[node.expr] + der_dict[node]` When `node.expr` is `2.0`, `der_dict[node.expr]` (the `__getitem__` call) is called first. If `2.0` hasn't been set in `der_dict` yet, `__getitem__` raises `KeyError`. Usually, in automatic differentiation, we only care about derivatives with respect to variables (or other components). Constants have zero derivative. If `node.expr` is a constant, we should probably not be adding anything to `der_dict[node.expr]` because we can't take the derivative with respect to a constant. Wait, `der_dict` is the dictionary of derivatives of the root expression with respect to the components. If we have `z = f(y)` and `y = g(x)`, then `dz/dx = dz/dy * dy/dx`. `der_dict[y]` stores `dz/dy`. `node` is `y`. `node.expr` is `g(x)`. `_diff_GeneralExpression` is propogating the derivative from the named expression `y` to the components that make up `g(x)`. If `g(x) = 2`, then `dg/dx = 0`. `der_dict[node.expr]` would be `der_dict[2]`. But we can't take the derivative with respect to the constant `2`. So, if `node.expr` is a constant, we should just ignore it. What constitutes a "constant" in Pyomo? Typically, things that are not `Var` or other differentiable components. However, `node.expr` could be a complex expression that happens to evaluate to a constant, or it could be a simple float/int. In Pyomo, expressions are often `NumericExpr` or subclasses. Constants are usually `float`, `int`, or Pyomo's internal constant representations. Let's see what `node.expr` is in the reproduction case. I'll add a print statement to `_diff_GeneralExpression` to see what `node.expr` is.
TOOL CALL · run_command
{
"command": "python3 - <<'PY'\nimport pyomo.environ as pyo\nfrom pyomo.core.expr.calculus.derivatives import Modes, differentiate\nimport pyomo.core.expr.calculus.diff_with_pyomo as diff_with_pyomo\n\nm = pyo.ConcreteModel()\nm.x = pyo.Var(initialize=0)\n\n@m.Expression()\ndef y(blk):\n return 2\n\n@m.Expression()\ndef product(blk):\n return blk.x * blk.y\n\n# Patching the function to print the node.expr\nold_diff_general_expression = diff_with_pyomo._diff_GeneralExpression\ndef new_diff_general_expression(node, val_dict, der_dict):\n print(f\"node: {node}, node.expr: {node.expr}, type(node.expr): {type(node.expr)}\")\n return old_diff_general_expression(node, val_dict, der_dict)\n\ndiff_with_pyomo._diff_GeneralExpression = new_diff_general_expression\n\ntry:\n diff_expr = differentiate(\n expr=m.product,\n wrt=m.x,\n mode=Modes.reverse_symbolic\n )\n diff_expr.pprint()\nexcept Exception as e:\n import traceback\n traceback.print_exc()\nPY\n"
}Result of run_command 1,443 characters
{
"status": "ok",
"stdout": "node: product, node.expr: x*2, type(node.expr): <class 'pyomo.core.expr.numeric_expr.ProductExpression'>\nnode: y, node.expr: 2.0, type(node.expr): <class 'pyomo.core.expr.numvalue.NumericConstant'>\n",
"stderr": "Traceback (most recent call last):\n File \"/workspace/pyomo/common/collections/component_map.py\", line 71, in __getitem__\n return self._dict[id(obj)][1]\nKeyError: 128142104586096\n\nDuring handling of the above exception, another exception occurred:\n\nTraceback (most recent call last):\n File \"<stdin>\", line 25, in <module>\n File \"/workspace/pyomo/core/expr/calculus/derivatives.py\", line 96, in differentiate\n res = reverse_sd(expr=expr)\n File \"/workspace/pyomo/core/expr/calculus/diff_with_pyomo.py\", line 484, in reverse_sd\n return _reverse_diff_helper(expr, False)\n File \"/workspace/pyomo/core/expr/calculus/diff_with_pyomo.py\", line 442, in _reverse_diff_helper\n _diff_GeneralExpression(e, val_dict, der_dict)\n File \"<stdin>\", line 20, in new_diff_general_expression\n File \"/workspace/pyomo/core/expr/calculus/diff_with_pyomo.py\", line 331, in _diff_GeneralExpression\n der_dict[node.expr] += der_dict[node]\n File \"/workspace/pyomo/common/collections/component_map.py\", line 73, in __getitem__\n raise KeyError(\"Component with id '%s': %s\" % (id(obj), str(obj)))\nKeyError: \"Component with id '128142104586096': 2.0\"\n",
"exit_code": 0
}Generated tokens 878 tokens · stopped: STOP
`ComponentMap` uses `id(obj)` as keys in `self._dict`.
In `_diff_GeneralExpression`, `der_dict[node.expr] += der_dict[node]`
This is equivalent to:
`der_dict[node.expr] = der_dict[node.expr] + der_dict[node]`
When `node.expr` is `2.0`, `der_dict[node.expr]` (the `__getitem__` call) is called first.
If `2.0` hasn't been set in `der_dict` yet, `__getitem__` raises `KeyError`.
Usually, in automatic differentiation, we only care about derivatives with respect to variables (or other components). Constants have zero derivative.
If `node.expr` is a constant, we should probably not be adding anything to `der_dict[node.expr]` because we can't take the derivative with respect to a constant.
Wait, `der_dict` is the dictionary of derivatives of the root expression with respect to the components.
If we have `z = f(y)` and `y = g(x)`, then `dz/dx = dz/dy * dy/dx`.
`der_dict[y]` stores `dz/dy`.
`node` is `y`. `node.expr` is `g(x)`.
`_diff_GeneralExpression` is propogating the derivative from the named expression `y` to the components that make up `g(x)`.
If `g(x) = 2`, then `dg/dx = 0`.
`der_dict[node.expr]` would be `der_dict[2]`.
But we can't take the derivative with respect to the constant `2`.
So, if `node.expr` is a constant, we should just ignore it.
What constitutes a "constant" in Pyomo?
Typically, things that are not `Var` or other differentiable components.
However, `node.expr` could be a complex expression that happens to evaluate to a constant, or it could be a simple float/int.
In Pyomo, expressions are often `NumericExpr` or subclasses.
Constants are usually `float`, `int`, or Pyomo's internal constant representations.
Let's see what `node.expr` is in the reproduction case.
I'll add a print statement to `_diff_GeneralExpression` to see what `node.expr` is.
<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY'
import pyomo.environ as pyo
from pyomo.core.expr.calculus.derivatives import Modes, differentiate
import pyomo.core.expr.calculus.diff_with_pyomo as diff_with_pyomo
m = pyo.ConcreteModel()
m.x = pyo.Var(initialize=0)
@m.Expression()
def y(blk):
return 2
@m.Expression()
def product(blk):
return blk.x * blk.y
# Patching the function to print the node.expr
old_diff_general_expression = diff_with_pyomo._diff_GeneralExpression
def new_diff_general_expression(node, val_dict, der_dict):
print(f"node: {node}, node.expr: {node.expr}, type(node.expr): {type(node.expr)}")
return old_diff_general_expression(node, val_dict, der_dict)
diff_with_pyomo._diff_GeneralExpression = new_diff_general_expression
try:
diff_expr = differentiate(
expr=m.product,
wrt=m.x,
mode=Modes.reverse_symbolic
)
diff_expr.pprint()
except Exception as e:
import traceback
traceback.print_exc()
PY
<|"|>}<tool_call|><|tool_response>
Turn 6at 196 s766 tokens out9,573 prompt tokens
The output shows: `node: product, node.expr: x*2, type(node.expr): <class 'pyomo.core.expr.numeric_expr.ProductExpression'>` `node: y, node.expr: 2.0, type(node.expr): <class 'pyomo.core.expr.numvalue.NumericConstant'>` So when `node` is `y`, `node.expr` is a `NumericConstant`. The error happens when trying to access `der_dict[node.expr]`. If `node.expr` is something that shouldn't be in `der_dict` (like a constant), we should skip it. A `ComponentMap` is used to track derivatives of the root with respect to components. Constants are not components. Let's see where `NumericConstant` is defined and if there's a better way to check if something is a constant. `pyomo/core/expr/numvalue.py` likely holds `NumericConstant`. However, the simplest fix in `_diff_GeneralExpression` would be to check if `node.expr` is an object that can be a key in `der_dict`. But wait, `der_dict` is just a `ComponentMap`. `ComponentMap`'s `__getitem__` raises `KeyError` if the object is not present. The line `der_dict[node.expr] += der_dict[node]` is doing an in-place addition. This means it's doing `der_dict[node.expr] = der_dict[node.expr] + der_dict[node]`. If `node.expr` is a constant, `der_dict[node.expr]` will always raise `KeyError` unless it was previously added (which it wouldn't be, because it's a constant). Actually, we should check if `node.expr` is a component or something that should have a derivative. But in `_diff_GeneralExpression`, `node` is an `Expression` component. `node.expr` is the expression it's wrapping. If `node.expr` is a `NumericConstant`, its derivative is 0, so `der_dict[node.expr] += ...` doesn't make sense anyway, and we can't track the derivative wrt a constant. Wait, what if `node.expr` is a sum of variables? Then we should propagate the derivative. If `node.expr` is `x + z`, then `der_dict[node]` should be split between `x` and `z`. The `_diff_GeneralExpression` function just says `der_dict[node.expr] += der_dict[node]`. Then some other function (like `_diff_SumExpression`) will take `der_dict[node.expr]` and propagate it further. If `node.expr` is a constant, it's a leaf in the expression tree, and we don't need to propagate any further. So, if `node.expr` is a constant, we can just do nothing. How to check if `node.expr` is a constant? We saw `pyomo.core.expr.numvalue.NumericConstant`. Let's see if there are other types of constants. I'll check `pyomo/core/expr/numvalue.py`.
TOOL CALL · read_file
{
"filepath": "pyomo/core/expr/numvalue.py"
}Result of read_file 4,536 characters
{
"status": "ok",
"filepath": "pyomo/core/expr/numvalue.py",
"content": "# ___________________________________________________________________________\n#\n# Pyomo: Python Optimization Modeling Objects\n# Copyright (c) 2008-2022\n# National Technology and Engineering Solutions of Sandia, LLC\n# Under the terms of Contract DE-NA0003525 with National Technology and\n# Engineering Solutions of Sandia, LLC, the U.S. Government retains certain\n# rights in this software.\n# This software is distributed under the 3-clause BSD License.\n# ___________________________________________________________________________\n\n__all__ = (\n 'value',\n 'is_constant',\n 'is_fixed',\n 'is_variable_type',\n 'is_potentially_variable',\n 'NumericValue',\n 'ZeroConstant',\n 'native_numeric_types',\n 'native_types',\n 'nonpyomo_leaf_types',\n 'polynomial_degree',\n)\n\nimport collections\nimport sys\nimport logging\n\nfrom pyomo.common.deprecation import (\n deprecated,\n deprecation_warning,\n relocated_module_attribute,\n)\nfrom pyomo.core.expr.expr_common import ExpressionType\nfrom pyomo.core.expr.numeric_expr import NumericValue\nimport pyomo.common.numeric_types as _numeric_types\n\n# TODO: update Pyomo to import these objects from common.numeric_types\n# (and not from here)\nfrom pyomo.common.numeric_types import (\n nonpyomo_leaf_types,\n native_types,\n native_numeric_types,\n native_integer_types,\n native_logical_types,\n pyomo_constant_types,\n check_if_numeric_type,\n value,\n)\nfrom pyomo.core.pyomoobject import PyomoObject\n\nrelocated_module_attribute(\n 'native_boolean_types',\n 'pyomo.common.numeric_types._native_boolean_types',\n version='6.6.0',\n f_globals=globals(),\n msg=\"The native_boolean_types set will be removed in the future: the set \"\n \"contains types that were convertible to bool, and not types that should \"\n \"be treated as if they were bool (as was the case for the other \"\n \"native_*_types sets). Users likely should use native_logical_types.\",\n)\nrelocated_module_attribute(\n 'RegisterNumericType',\n 'pyomo.common.numeric_types.RegisterNumericType',\n version='6.6.0',\n f_globals=globals(),\n)\nrelocated_module_attribute(\n 'RegisterIntegerType',\n 'pyomo.common.numeric_types.RegisterIntegerType',\n version='6.6.0',\n f_globals=globals(),\n)\nrelocated_module_attribute(\n 'RegisterBooleanType',\n 'pyomo.common.numeric_types.RegisterBooleanType',\n version='6.6.0',\n f_globals=globals(),\n)\nrelocated_module_attribute(\n 'NumericValue',\n 'pyomo.core.expr.numeric_expr.NumericValue',\n version='6.6.2',\n f_globals=globals(),\n)\nrelocated_module_attribute(\n 'NumericNDArray',\n 'pyomo.core.expr.numeric_expr.NumericNDArray',\n version='6.6.2',\n f_globals=globals(),\n)\n\nlogger = logging.getLogger('pyomo.core')\n\n\n##------------------------------------------------------------------------\n##\n## Standard types of expressions\n##\n##------------------------------------------------------------------------\n\n\nclass NonNumericValue(object):\n \"\"\"An object that contains a non-numeric value\n\n Constructor Arguments:\n value The initial value.\n \"\"\"\n\n __slots__ = ('value',)\n\n def __init__(self, value):\n self.value = value\n\n def __str__(self):\n return str(self.value)\n\n\nnonpyomo_leaf_types.add(NonNumericValue)\n\n\ndef is_constant(obj):\n \"\"\"\n A utility function that returns a boolean that indicates\n whether the object is a constant.\n \"\"\"\n # JDS: NB: I am not sure why we allow str to be a constant, but\n # since we have historically done so, we check for type membership\n # in native_types and not in native_numeric_types.\n #\n if obj.__class__ in native_types:\n return True\n try:\n return obj.is_constant()\n except AttributeError:\n pass\n # Now we need to confirm that we have an unknown numeric type\n #\n # As this branch is only hit for previously unknown (to Pyomo)\n # types that behave reasonably like numbers, we know they *must*\n # be constant.\n if check_if_numeric_type(obj):\n return True\n else:\n raise TypeError(\n \"Cannot assess properties of object with unknown type: %s\"\n % (type(obj).__name__,)\n )\n",
"start_line": 1,
"end_line": 150,
"total_lines": 433,
"is_truncated": true
}Generated tokens 766 tokens · stopped: STOP
The output shows:
`node: product, node.expr: x*2, type(node.expr): <class 'pyomo.core.expr.numeric_expr.ProductExpression'>`
`node: y, node.expr: 2.0, type(node.expr): <class 'pyomo.core.expr.numvalue.NumericConstant'>`
So when `node` is `y`, `node.expr` is a `NumericConstant`.
The error happens when trying to access `der_dict[node.expr]`.
If `node.expr` is something that shouldn't be in `der_dict` (like a constant), we should skip it.
A `ComponentMap` is used to track derivatives of the root with respect to components. Constants are not components.
Let's see where `NumericConstant` is defined and if there's a better way to check if something is a constant.
`pyomo/core/expr/numvalue.py` likely holds `NumericConstant`.
However, the simplest fix in `_diff_GeneralExpression` would be to check if `node.expr` is an object that can be a key in `der_dict`.
But wait, `der_dict` is just a `ComponentMap`. `ComponentMap`'s `__getitem__` raises `KeyError` if the object is not present.
The line `der_dict[node.expr] += der_dict[node]` is doing an in-place addition.
This means it's doing `der_dict[node.expr] = der_dict[node.expr] + der_dict[node]`.
If `node.expr` is a constant, `der_dict[node.expr]` will always raise `KeyError` unless it was previously added (which it wouldn't be, because it's a constant).
Actually, we should check if `node.expr` is a component or something that should have a derivative.
But in `_diff_GeneralExpression`, `node` is an `Expression` component. `node.expr` is the expression it's wrapping.
If `node.expr` is a `NumericConstant`, its derivative is 0, so `der_dict[node.expr] += ...` doesn't make sense anyway, and we can't track the derivative wrt a constant.
Wait, what if `node.expr` is a sum of variables? Then we should propagate the derivative.
If `node.expr` is `x + z`, then `der_dict[node]` should be split between `x` and `z`.
The `_diff_GeneralExpression` function just says `der_dict[node.expr] += der_dict[node]`.
Then some other function (like `_diff_SumExpression`) will take `der_dict[node.expr]` and propagate it further.
If `node.expr` is a constant, it's a leaf in the expression tree, and we don't need to propagate any further.
So, if `node.expr` is a constant, we can just do nothing.
How to check if `node.expr` is a constant?
We saw `pyomo.core.expr.numvalue.NumericConstant`.
Let's see if there are other types of constants.
I'll check `pyomo/core/expr/numvalue.py`.<channel|><|tool_call>call:read_file{filepath:<|"|>pyomo/core/expr/numvalue.py<|"|>}<tool_call|><|tool_response>
Turn 7at 206 s164 tokens out11,683 prompt tokens
There is a utility function `is_constant(obj)` in `pyomo.core.expr.numvalue`. Let's see if I can use `is_constant` to filter out the constants in `_diff_GeneralExpression`. Wait, `pyomo/core/expr/calculus/diff_with_pyomo.py` might already have access to `is_constant` or can import it. Let's check the imports in `pyomo/core/expr/calculus/diff_with_pyomo.py`.
TOOL CALL · read_file
{
"end_line": 50,
"filepath": "pyomo/core/expr/calculus/diff_with_pyomo.py",
"start_line": 1
}Result of read_file 2,096 characters
{
"status": "ok",
"filepath": "pyomo/core/expr/calculus/diff_with_pyomo.py",
"content": "# ___________________________________________________________________________\n#\n# Pyomo: Python Optimization Modeling Objects\n# Copyright (c) 2008-2022\n# National Technology and Engineering Solutions of Sandia, LLC\n# Under the terms of Contract DE-NA0003525 with National Technology and\n# Engineering Solutions of Sandia, LLC, the U.S. Government retains certain\n# rights in this software.\n# This software is distributed under the 3-clause BSD License.\n# ___________________________________________________________________________\n\nfrom pyomo.common.collections import ComponentMap, ComponentSet\nimport pyomo.core.expr as _expr\nfrom pyomo.core.expr.visitor import ExpressionValueVisitor, nonpyomo_leaf_types\nfrom pyomo.core.expr.numvalue import value, is_constant\nfrom pyomo.core.expr import exp, log, sin, cos\nimport math\n\n\n\"\"\"\nThe purpose of this file is to perform symbolic differentiation and \nfirst order automatic differentiation directly with pyomo \nexpressions. This is certainly not as efficient as doing AD in C or \nC++, but it avoids the translation from pyomo expressions to a form \nwhere AD can be performed efficiently. The only functions that are \nmeant to be used by users are reverse_ad and reverse_sd. First, \nvalues are propagated from the leaves to each node in the tree with \nthe LeafToRoot visitors. Then derivative values are propagated from \nthe root to the leaves with the RootToLeaf visitors.\n\"\"\"\n\n\nclass DifferentiationException(Exception):\n pass\n\n\ndef _diff_ProductExpression(node, val_dict, der_dict):\n \"\"\"\n\n Parameters\n ----------\n node: pyomo.core.expr.numeric_expr.ProductExpression\n val_dict: ComponentMap\n der_dict: ComponentMap\n \"\"\"\n assert len(node.args) == 2\n arg1, arg2 = node.args\n der = der_dict[node]\n der_dict[arg1] += der * val_dict[arg2]\n der_dict[arg2] += der * val_dict[arg1]",
"start_line": 1,
"end_line": 50,
"total_lines": 484,
"is_truncated": false
}Generated tokens 164 tokens · stopped: STOP
There is a utility function `is_constant(obj)` in `pyomo.core.expr.numvalue`.
Let's see if I can use `is_constant` to filter out the constants in `_diff_GeneralExpression`.
Wait, `pyomo/core/expr/calculus/diff_with_pyomo.py` might already have access to `is_constant` or can import it.
Let's check the imports in `pyomo/core/expr/calculus/diff_with_pyomo.py`.
<channel|><|tool_call>call:read_file{end_line:50,filepath:<|"|>pyomo/core/expr/calculus/diff_with_pyomo.py<|"|>,start_line:1}<tool_call|><|tool_response>
Turn 8at 239 s623 tokens out12,454 prompt tokens
`is_constant` is already imported from `pyomo.core.expr.numvalue` on line 8!
So I can just change `_diff_GeneralExpression` to:
```python
def _diff_GeneralExpression(node, val_dict, der_dict):
"""
Reverse automatic differentiation for named expressions.
Parameters
----------
node: The named expression
val_dict: ComponentMap
der_dict: ComponentMap
"""
if not is_constant(node.expr):
der_dict[node.expr] += der_dict[node]
```
Let's verify if this fix works with the reproduction script.
TOOL CALL · run_command
{
"command": "python3 - <<'PY'\nimport pyomo.environ as pyo\nfrom pyomo.core.expr.calculus.derivatives import Modes, differentiate\nimport pyomo.core.expr.calculus.diff_with_pyomo as diff_with_pyomo\n\nm = pyo.ConcreteModel()\nm.x = pyo.Var(initialize=0)\n\n@m.Expression()\ndef y(blk):\n return 2\n\n@m.Expression()\ndef product(blk):\n return blk.x * blk.y\n\n# Patching the function to skip constants\ndef new_diff_general_expression(node, val_dict, der_dict):\n from pyomo.core.expr.numvalue import is_constant\n if not is_constant(node.expr):\n # Simulate the original behavior for non-constants\n # We need to access the original function or just implement the line\n der_dict[node.expr] = der_dict.get(node.expr, 0) + der_dict[node]\n\n# Wait, der_dict is a ComponentMap, it might not have .get(). Let's see.\n# Actually, I can just monkeypatch the existing function properly.\n\noriginal_func = diff_with_pyomo._diff_GeneralExpression\ndef patched_diff_general_expression(node, val_dict, der_dict):\n from pyomo.core.expr.numvalue import is_constant\n if is_constant(node.expr):\n return\n original_func(node, val_dict, der_dict)\n\ndiff_with_pyomo._diff_GeneralExpression = patched_diff_general_expression\n\ntry:\n diff_expr = differentiate(\n expr=m.product,\n wrt=m.x,\n mode=Modes.reverse_symbolic\n )\n print(\"Differentiation successful!\")\n diff_expr.pprint()\nexcept Exception as e:\n import traceback\n traceback.print_exc()\nPY\n"
}Result of run_command 159 characters
{
"status": "ok",
"stdout": "Differentiation successful!\ny : Size=1, Index=None\n Key : Expression\n None : 2.0\n",
"stderr": "",
"exit_code": 0
}Generated tokens 623 tokens · stopped: STOP
`is_constant` is already imported from `pyomo.core.expr.numvalue` on line 8!
So I can just change `_diff_GeneralExpression` to:
```python
def _diff_GeneralExpression(node, val_dict, der_dict):
"""
Reverse automatic differentiation for named expressions.
Parameters
----------
node: The named expression
val_dict: ComponentMap
der_dict: ComponentMap
"""
if not is_constant(node.expr):
der_dict[node.expr] += der_dict[node]
```
Let's verify if this fix works with the reproduction script.
<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY'
import pyomo.environ as pyo
from pyomo.core.expr.calculus.derivatives import Modes, differentiate
import pyomo.core.expr.calculus.diff_with_pyomo as diff_with_pyomo
m = pyo.ConcreteModel()
m.x = pyo.Var(initialize=0)
@m.Expression()
def y(blk):
return 2
@m.Expression()
def product(blk):
return blk.x * blk.y
# Patching the function to skip constants
def new_diff_general_expression(node, val_dict, der_dict):
from pyomo.core.expr.numvalue import is_constant
if not is_constant(node.expr):
# Simulate the original behavior for non-constants
# We need to access the original function or just implement the line
der_dict[node.expr] = der_dict.get(node.expr, 0) + der_dict[node]
# Wait, der_dict is a ComponentMap, it might not have .get(). Let's see.
# Actually, I can just monkeypatch the existing function properly.
original_func = diff_with_pyomo._diff_GeneralExpression
def patched_diff_general_expression(node, val_dict, der_dict):
from pyomo.core.expr.numvalue import is_constant
if is_constant(node.expr):
return
original_func(node, val_dict, der_dict)
diff_with_pyomo._diff_GeneralExpression = patched_diff_general_expression
try:
diff_expr = differentiate(
expr=m.product,
wrt=m.x,
mode=Modes.reverse_symbolic
)
print("Differentiation successful!")
diff_expr.pprint()
except Exception as e:
import traceback
traceback.print_exc()
PY
<|"|>}<tool_call|><|tool_response>
Turn 9at 253 s202 tokens out13,146 prompt tokens
The differentiation was successful and the result is `2.0`, which is correct because `product = x * 2`, and `d(product)/dx = 2`. Now let's consider if this fix is sufficient. Are there other places where `_diff_GeneralExpression` is called? It seems `_diff_GeneralExpression` is just one of many `_diff_*` functions called by `_diff_map`. Wait, let's look at how `_diff_map` is used. I'll read more of `pyomo/core/expr/calculus/diff_with_pyomo.py` to see how `_diff_map` is populated and used.
TOOL CALL · read_file
{
"end_line": 450,
"filepath": "pyomo/core/expr/calculus/diff_with_pyomo.py",
"start_line": 350
}Result of read_file 3,700 characters
{
"status": "ok",
"filepath": "pyomo/core/expr/calculus/diff_with_pyomo.py",
"content": "_diff_map = dict()\n_diff_map[_expr.ProductExpression] = _diff_ProductExpression\n_diff_map[_expr.DivisionExpression] = _diff_DivisionExpression\n_diff_map[_expr.PowExpression] = _diff_PowExpression\n_diff_map[_expr.SumExpression] = _diff_SumExpression\n_diff_map[_expr.MonomialTermExpression] = _diff_ProductExpression\n_diff_map[_expr.NegationExpression] = _diff_NegationExpression\n_diff_map[_expr.UnaryFunctionExpression] = _diff_UnaryFunctionExpression\n_diff_map[_expr.ExternalFunctionExpression] = _diff_ExternalFunctionExpression\n_diff_map[_expr.LinearExpression] = _diff_SumExpression\n_diff_map[_expr.AbsExpression] = _diff_abs\n\n_diff_map[_expr.NPV_ProductExpression] = _diff_ProductExpression\n_diff_map[_expr.NPV_DivisionExpression] = _diff_DivisionExpression\n_diff_map[_expr.NPV_PowExpression] = _diff_PowExpression\n_diff_map[_expr.NPV_SumExpression] = _diff_SumExpression\n_diff_map[_expr.NPV_NegationExpression] = _diff_NegationExpression\n_diff_map[_expr.NPV_UnaryFunctionExpression] = _diff_UnaryFunctionExpression\n_diff_map[_expr.NPV_ExternalFunctionExpression] = _diff_ExternalFunctionExpression\n_diff_map[_expr.NPV_AbsExpression] = _diff_abs\n\n\ndef _symbolic_value(x):\n return x\n\n\ndef _numeric_apply_operation(node, values):\n return node._apply_operation(values)\n\n\ndef _symbolic_apply_operation(node, values):\n return node\n\n\nclass _LeafToRootVisitor(ExpressionValueVisitor):\n def __init__(self, val_dict, der_dict, expr_list, numeric=True):\n \"\"\"\n Parameters\n ----------\n val_dict: ComponentMap\n der_dict: ComponentMap\n \"\"\"\n self.val_dict = val_dict\n self.der_dict = der_dict\n self.expr_list = expr_list\n assert len(self.expr_list) == 0\n assert len(self.val_dict) == 0\n assert len(self.der_dict) == 0\n if numeric:\n self.value_func = value\n self.operation_func = _numeric_apply_operation\n else:\n self.value_func = _symbolic_value\n self.operation_func = _symbolic_apply_operation\n\n def visit(self, node, values):\n self.val_dict[node] = self.operation_func(node, values)\n self.der_dict[node] = 0\n self.expr_list.append(node)\n return self.val_dict[node]\n\n def visiting_potential_leaf(self, node):\n if node in self.val_dict:\n return True, self.val_dict[node]\n\n if node.__class__ in nonpyomo_leaf_types:\n self.val_dict[node] = node\n self.der_dict[node] = 0\n return True, node\n\n if not node.is_expression_type():\n val = self.value_func(node)\n self.val_dict[node] = val\n self.der_dict[node] = 0\n return True, val\n\n return False, None\n\n\ndef _reverse_diff_helper(expr, numeric=True):\n val_dict = ComponentMap()\n der_dict = ComponentMap()\n expr_list = list()\n\n visitorA = _LeafToRootVisitor(val_dict, der_dict, expr_list, numeric=numeric)\n visitorA.dfs_postorder_stack(expr)\n\n der_dict[expr] = 1\n for e in reversed(expr_list):\n if e.__class__ in _diff_map:\n _diff_map[e.__class__](e, val_dict, der_dict)\n elif e.is_named_expression_type():\n _diff_GeneralExpression(e, val_dict, der_dict)\n else:\n raise DifferentiationException(\n 'Unsupported expression type for differentiation: {0}'.format(type(e))\n )\n\n return der_dict\n\n",
"start_line": 350,
"end_line": 450,
"total_lines": 484,
"is_truncated": false
}Generated tokens 202 tokens · stopped: STOP
The differentiation was successful and the result is `2.0`, which is correct because `product = x * 2`, and `d(product)/dx = 2`.
Now let's consider if this fix is sufficient.
Are there other places where `_diff_GeneralExpression` is called?
It seems `_diff_GeneralExpression` is just one of many `_diff_*` functions called by `_diff_map`.
Wait, let's look at how `_diff_map` is used.
I'll read more of `pyomo/core/expr/calculus/diff_with_pyomo.py` to see how `_diff_map` is populated and used.
<channel|><|tool_call>call:read_file{end_line:450,filepath:<|"|>pyomo/core/expr/calculus/diff_with_pyomo.py<|"|>,start_line:350}<tool_call|><|tool_response>
Turn 10at 322 s1,225 tokens out14,545 prompt tokens
In `_reverse_diff_helper`:
```python
der_dict[expr] = 1
for e in reversed(expr_list):
if e.__class__ in _diff_map:
_diff_map[e.__class__](e, val_dict, der_dict)
elif e.is_named_expression_type():
_diff_GeneralExpression(e, val_dict, der_dict)
else:
raise DifferentiationException(
'Unsupported expression type for differentiation: {0}'.format(type(e))
)
```
An `Expression` component (a named expression) will trigger `_diff_GeneralExpression`.
`_diff_GeneralExpression` then does `der_dict[node.expr] += der_dict[node]`.
If `node.expr` is a constant, it is not in `_diff_map`'s keys (which are expression types like `ProductExpression`, etc.) and it's not a named expression.
Wait, if `node.expr` is a constant, it will eventually be visited by `_LeafToRootVisitor` and added to `val_dict` and `der_dict`.
Let's look at `_LeafToRootVisitor.visiting_potential_leaf`:
```python
def visiting_potential_leaf(self, node):
if node in self.val_dict:
return True, self.val_dict[node]
if node.__class__ in nonpyomo_leaf_types:
self.val_dict[node] = node
self.der_dict[node] = 0
return True, node
if not node.is_expression_type():
val = self.value_func(node)
self.val_dict[node] = val
self.der_dict[node] = 0
return True, val
return False, None
```
And `visit`:
```python
def visit(self, node, values):
self.val_dict[node] = self.operation_func(node, values)
self.der_dict[node] = 0
self.expr_list.append(node)
return self.val_dict[node]
```
If `node` is a `NumericConstant`, `is_expression_type()` should be true.
Wait, let's check `NumericConstant` in `pyomo/core/expr/numvalue.py` or `pyomo/core/expr/numeric_expr.py`.
Actually, if `node.expr` is a `NumericConstant`, it should have been added to `der_dict` by the visitor, right?
Wait, let's check if `NumericConstant` is an "expression type".
If I use the reproduction script and print `der_dict` before `_diff_GeneralExpression` is called:
TOOL CALL · run_command
{
"command": "python3 - <<'PY'\nimport pyomo.environ as pyo\nfrom pyomo.core.expr.calculus.derivatives import Modes, differentiate\nimport pyomo.core.expr.calculus.diff_with_pyomo as diff_with_pyomo\n\nm = pyo.ConcreteModel()\nm.x = pyo.Var(initialize=0)\n\n@m.Expression()\ndef y(blk):\n return 2\n\n@m.Expression()\ndef product(blk):\n return blk.x * blk.y\n\noriginal_reverse_diff_helper = diff_with_pyomo._reverse_diff_helper\ndef patched_reverse_diff_helper(expr, numeric=True):\n val_dict = diff_with_pyomo.ComponentMap()\n der_dict = diff_with_pyomo.ComponentMap()\n expr_list = list()\n\n visitorA = diff_with_pyomo._LeafToRootVisitor(val_dict, der_dict, expr_list, numeric=numeric)\n visitorA.dfs_postorder_stack(expr)\n\n print(f\"der_dict after visitor: {der_dict._dict.keys()}\")\n \n der_dict[expr] = 1\n for e in reversed(expr_list):\n print(f\"Processing e: {e}, type: {type(e)}\")\n if e.__class__ in diff_with_pyomo._diff_map:\n diff_with_pyomo._diff_map[e.__class__](e, val_dict, der_dict)\n elif e.is_named_expression_type():\n print(f\" Calling _diff_GeneralExpression for {e}, e.expr: {e.expr}\")\n diff_with_pyomo._diff_GeneralExpression(e, val_dict, der_dict)\n else:\n raise diff_with_pyomo.DifferentiationException(\n 'Unsupported expression type for differentiation: {0}'.format(type(e))\n )\n\n return der_dict\n\ndiff_with_pyomo._reverse_diff_helper = patched_reverse_diff_helper\n\ntry:\n diff_expr = differentiate(\n expr=m.product,\n wrt=m.x,\n mode=Modes.reverse_symbolic\n )\n diff_expr.pprint()\nexcept Exception as e:\n import traceback\n traceback.print_exc()\nPY\n"
}Result of run_command 1,570 characters
{
"status": "ok",
"stdout": "der_dict after visitor: dict_keys([130929167799280, 130929185784080, 130929167866416, 130929167822528, 130929167875136])\nProcessing e: product, type: <class 'pyomo.core.base.expression.ScalarExpression'>\n Calling _diff_GeneralExpression for product, e.expr: x*2\nProcessing e: x*2, type: <class 'pyomo.core.expr.numeric_expr.ProductExpression'>\nProcessing e: y, type: <class 'pyomo.core.base.expression.ScalarExpression'>\n Calling _diff_GeneralExpression for y, e.expr: 2.0\n",
"stderr": "Traceback (most recent call last):\n File \"/workspace/pyomo/common/collections/component_map.py\", line 71, in __getitem__\n return self._dict[id(obj)][1]\nKeyError: 130929167822768\n\nDuring handling of the above exception, another exception occurred:\n\nTraceback (most recent call last):\n File \"<stdin>\", line 45, in <module>\n File \"/workspace/pyomo/core/expr/calculus/derivatives.py\", line 96, in differentiate\n res = reverse_sd(expr=expr)\n File \"/workspace/pyomo/core/expr/calculus/diff_with_pyomo.py\", line 484, in reverse_sd\n return _reverse_diff_helper(expr, False)\n File \"<stdin>\", line 34, in patched_reverse_diff_helper\n File \"/workspace/pyomo/core/expr/calculus/diff_with_pyomo.py\", line 331, in _diff_GeneralExpression\n der_dict[node.expr] += der_dict[node]\n File \"/workspace/pyomo/common/collections/component_map.py\", line 73, in __getitem__\n raise KeyError(\"Component with id '%s': %s\" % (id(obj), str(obj)))\nKeyError: \"Component with id '130929167822768': 2.0\"\n",
"exit_code": 0
}Generated tokens 1,225 tokens · stopped: STOP
In `_reverse_diff_helper`:
```python
der_dict[expr] = 1
for e in reversed(expr_list):
if e.__class__ in _diff_map:
_diff_map[e.__class__](e, val_dict, der_dict)
elif e.is_named_expression_type():
_diff_GeneralExpression(e, val_dict, der_dict)
else:
raise DifferentiationException(
'Unsupported expression type for differentiation: {0}'.format(type(e))
)
```
An `Expression` component (a named expression) will trigger `_diff_GeneralExpression`.
`_diff_GeneralExpression` then does `der_dict[node.expr] += der_dict[node]`.
If `node.expr` is a constant, it is not in `_diff_map`'s keys (which are expression types like `ProductExpression`, etc.) and it's not a named expression.
Wait, if `node.expr` is a constant, it will eventually be visited by `_LeafToRootVisitor` and added to `val_dict` and `der_dict`.
Let's look at `_LeafToRootVisitor.visiting_potential_leaf`:
```python
def visiting_potential_leaf(self, node):
if node in self.val_dict:
return True, self.val_dict[node]
if node.__class__ in nonpyomo_leaf_types:
self.val_dict[node] = node
self.der_dict[node] = 0
return True, node
if not node.is_expression_type():
val = self.value_func(node)
self.val_dict[node] = val
self.der_dict[node] = 0
return True, val
return False, None
```
And `visit`:
```python
def visit(self, node, values):
self.val_dict[node] = self.operation_func(node, values)
self.der_dict[node] = 0
self.expr_list.append(node)
return self.val_dict[node]
```
If `node` is a `NumericConstant`, `is_expression_type()` should be true.
Wait, let's check `NumericConstant` in `pyomo/core/expr/numvalue.py` or `pyomo/core/expr/numeric_expr.py`.
Actually, if `node.expr` is a `NumericConstant`, it should have been added to `der_dict` by the visitor, right?
Wait, let's check if `NumericConstant` is an "expression type".
If I use the reproduction script and print `der_dict` before `_diff_GeneralExpression` is called:
<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY'
import pyomo.environ as pyo
from pyomo.core.expr.calculus.derivatives import Modes, differentiate
import pyomo.core.expr.calculus.diff_with_pyomo as diff_with_pyomo
m = pyo.ConcreteModel()
m.x = pyo.Var(initialize=0)
@m.Expression()
def y(blk):
return 2
@m.Expression()
def product(blk):
return blk.x * blk.y
original_reverse_diff_helper = diff_with_pyomo._reverse_diff_helper
def patched_reverse_diff_helper(expr, numeric=True):
val_dict = diff_with_pyomo.ComponentMap()
der_dict = diff_with_pyomo.ComponentMap()
expr_list = list()
visitorA = diff_with_pyomo._LeafToRootVisitor(val_dict, der_dict, expr_list, numeric=numeric)
visitorA.dfs_postorder_stack(expr)
print(f"der_dict after visitor: {der_dict._dict.keys()}")
der_dict[expr] = 1
for e in reversed(expr_list):
print(f"Processing e: {e}, type: {type(e)}")
if e.__class__ in diff_with_pyomo._diff_map:
diff_with_pyomo._diff_map[e.__class__](e, val_dict, der_dict)
elif e.is_named_expression_type():
print(f" Calling _diff_GeneralExpression for {e}, e.expr: {e.expr}")
diff_with_pyomo._diff_GeneralExpression(e, val_dict, der_dict)
else:
raise diff_with_pyomo.DifferentiationException(
'Unsupported expression type for differentiation: {0}'.format(type(e))
)
return der_dict
diff_with_pyomo._reverse_diff_helper = patched_reverse_diff_helper
try:
diff_expr = differentiate(
expr=m.product,
wrt=m.x,
mode=Modes.reverse_symbolic
)
diff_expr.pprint()
except Exception as e:
import traceback
traceback.print_exc()
PY
<|"|>}<tool_call|><|tool_response>
Turn 11at 427 s1,340 tokens out6,363 prompt tokens
Aha! Look at the output:
`Processing e: y, type: <class 'pyomo.core.base.expression.ScalarExpression'>`
`Calling _diff_GeneralExpression for y, e.expr: 2.0`
And then it fails with `KeyError: "Component with id '130929167822768': 2.0"`.
The object `2.0` is a float (or `NumericConstant` which behaves like one in some contexts) and it's NOT in `der_dict`.
Wait, why is it not in `der_dict`?
The `_LeafToRootVisitor` should have visited it if it was part of the expression tree.
Let's check `product = x * y`.
`y` is an `Expression` component. `y.expr` is `2.0`.
When visiting `product`, the visitor visits `x` and `y`.
Since `y` is a `ScalarExpression` (a named expression), it is visited.
But is `y.expr` visited?
In `_LeafToRootVisitor.visit`:
```python
def visit(self, node, values):
self.val_dict[node] = self.operation_func(node, values)
self.der_dict[node] = 0
self.expr_list.append(node)
return self.val_dict[node]
```
And the `_LeafToRootVisitor` is a `ExpressionValueVisitor`.
Let's see how `ExpressionValueVisitor` handles named expressions.
If `y` is a named expression, the visitor will visit `y`. Since `y` is an expression, it will probably call `visit` on it.
But `y` itself might not be expanded into its underlying expression during the first visitor pass.
Wait, looking at the logs:
`der_dict after visitor: dict_keys([130929167799280, 130929185784080, 130929167866416, 130929167822528, 130929167875136])`
The `KeyError` was `130929167822768`. This key is NOT in the visitor's `der_dict`.
So `2.0` was never added to `der_dict` because the visitor probably stopped at the named expression `y` and didn't go deeper into `y.expr` if `y` was treated as a leaf or something.
Actually, `_diff_GeneralExpression`'s purpose is exactly to propagate the derivative from the named expression `y` to its underlying expression `y.expr`.
`der_dict[node.expr] += der_dict[node]`
But if `node.expr` is a constant, it's NOT a Pyomo expression that we care about differentiating. It's just a number.
Numbers are not typically put into `der_dict` because their derivative is always 0 and they aren't "nodes" in the symbolic graph that we can assign derivatives to (or rather, they are leaves that don't need it).
Wait, `_LeafToRootVisitor.visiting_potential_leaf`:
```python
if not node.is_expression_type():
val = self.value_func(node)
self.val_dict[node] = val
self.der_dict[node] = 0
return True, val
```
If `node` is `2.0`, `is_expression_type()` likely returns `False`. So it should have been added to `der_dict`.
BUT, if the visitor only visits `y` (the named expression) and doesn't visit `y.expr`, then `2.0` is never seen by the visitor.
Anyway, the fix to skip constants in `_diff_GeneralExpression` is correct and solves the problem.
Let's implement it.
TOOL CALL · edit_file
{
"differentiate\n\nm = pyo.ConcreteModel()\nm.x = pyo.Var(initialize=0)\n\n@m.Expression()\ndef y(blk)": "return 2\n\n@m.Expression()\ndef product(blk):\n return blk.x * blk.y\n\ntry:\n diff_expr = differentiate(\n expr=m.product",
"filepath": "pyomo/core/expr/calculus/diff_with_pyomo.py",
"new_string": "def _diff_GeneralExpression(node, val_dict, der_dict):\n \\\"\\\"\\\"\n Reverse automatic differentiation for named expressions.\n\n Parameters\n ----------\n node: The named expression\n val_dict: ComponentMap\n der_dict: ComponentMap\n \\\"\\\"\\\"\n if not is_constant(node.expr):\n der_dict[node.expr] += der_dict[node]\n",
"old_string": "def _diff_GeneralExpression(node, val_dict, der_dict):\n \\\"\\\"\\\"\n Reverse automatic differentiation for named expressions.\n\n Parameters\n ----------\n node: The named expression\n val_dict: ComponentMap\n der_dict: ComponentMap\n \\\"\\\"\\\"\n der_dict[node.expr] += der_dict[node]\n",
"wrt=m.x,\n mode=Modes.reverse_symbolic\n )\n print(\"Differentiation successful!\")\n diff_expr.pprint()\nexcept Exception as e": "import traceback\n traceback.print_exc()\nPY\n<|\"|>",
"}<|tool_call>call": "run_command{command:<|\"|>python3 - <<'PY'\nimport pyomo.environ as pyo\nfrom pyomo.core.expr.calculus.derivatives import Modes"
}Result of edit_file 548 characters
{
"status": "ok",
"filepath": "pyomo/core/expr/calculus/diff_with_pyomo.py",
"occurrences": 1,
"strategy": "unescaped",
"diff": "--- a/pyomo/core/expr/calculus/diff_with_pyomo.py\n+++ b/pyomo/core/expr/calculus/diff_with_pyomo.py\n@@ -328,7 +328,8 @@\n val_dict: ComponentMap\n der_dict: ComponentMap\n \"\"\"\n- der_dict[node.expr] += der_dict[node]\n+ if not is_constant(node.expr):\n+ der_dict[node.expr] += der_dict[node]\n \n \n def _diff_ExternalFunctionExpression(node, val_dict, der_dict):\n",
"is_truncated": false
}Generated tokens 1,340 tokens · stopped: STOP
Aha! Look at the output:
`Processing e: y, type: <class 'pyomo.core.base.expression.ScalarExpression'>`
`Calling _diff_GeneralExpression for y, e.expr: 2.0`
And then it fails with `KeyError: "Component with id '130929167822768': 2.0"`.
The object `2.0` is a float (or `NumericConstant` which behaves like one in some contexts) and it's NOT in `der_dict`.
Wait, why is it not in `der_dict`?
The `_LeafToRootVisitor` should have visited it if it was part of the expression tree.
Let's check `product = x * y`.
`y` is an `Expression` component. `y.expr` is `2.0`.
When visiting `product`, the visitor visits `x` and `y`.
Since `y` is a `ScalarExpression` (a named expression), it is visited.
But is `y.expr` visited?
In `_LeafToRootVisitor.visit`:
```python
def visit(self, node, values):
self.val_dict[node] = self.operation_func(node, values)
self.der_dict[node] = 0
self.expr_list.append(node)
return self.val_dict[node]
```
And the `_LeafToRootVisitor` is a `ExpressionValueVisitor`.
Let's see how `ExpressionValueVisitor` handles named expressions.
If `y` is a named expression, the visitor will visit `y`. Since `y` is an expression, it will probably call `visit` on it.
But `y` itself might not be expanded into its underlying expression during the first visitor pass.
Wait, looking at the logs:
`der_dict after visitor: dict_keys([130929167799280, 130929185784080, 130929167866416, 130929167822528, 130929167875136])`
The `KeyError` was `130929167822768`. This key is NOT in the visitor's `der_dict`.
So `2.0` was never added to `der_dict` because the visitor probably stopped at the named expression `y` and didn't go deeper into `y.expr` if `y` was treated as a leaf or something.
Actually, `_diff_GeneralExpression`'s purpose is exactly to propagate the derivative from the named expression `y` to its underlying expression `y.expr`.
`der_dict[node.expr] += der_dict[node]`
But if `node.expr` is a constant, it's NOT a Pyomo expression that we care about differentiating. It's just a number.
Numbers are not typically put into `der_dict` because their derivative is always 0 and they aren't "nodes" in the symbolic graph that we can assign derivatives to (or rather, they are leaves that don't need it).
Wait, `_LeafToRootVisitor.visiting_potential_leaf`:
```python
if not node.is_expression_type():
val = self.value_func(node)
self.val_dict[node] = val
self.der_dict[node] = 0
return True, val
```
If `node` is `2.0`, `is_expression_type()` likely returns `False`. So it should have been added to `der_dict`.
BUT, if the visitor only visits `y` (the named expression) and doesn't visit `y.expr`, then `2.0` is never seen by the visitor.
Anyway, the fix to skip constants in `_diff_GeneralExpression` is correct and solves the problem.
Let's implement it.<channel|><|tool_call>call:edit_file{filepath:<|"|>pyomo/core/expr/calculus/diff_with_pyomo.py<|"|>,new_string:<|"|>def _diff_GeneralExpression(node, val_dict, der_dict):
\"\"\"
Reverse automatic differentiation for named expressions.
Parameters
----------
node: The named expression
val_dict: ComponentMap
der_dict: ComponentMap
\"\"\"
if not is_constant(node.expr):
der_dict[node.expr] += der_dict[node]
<|"|>,old_string:<|"|>def _diff_GeneralExpression(node, val_dict, der_dict):
\"\"\"
Reverse automatic differentiation for named expressions.
Parameters
----------
node: The named expression
val_dict: ComponentMap
der_dict: ComponentMap
\"\"\"
der_dict[node.expr] += der_dict[node]
<|"|>}<|tool_call>call:run_command{command:<|"|>python3 - <<'PY'
import pyomo.environ as pyo
from pyomo.core.expr.calculus.derivatives import Modes, differentiate
m = pyo.ConcreteModel()
m.x = pyo.Var(initialize=0)
@m.Expression()
def y(blk):
return 2
@m.Expression()
def product(blk):
return blk.x * blk.y
try:
diff_expr = differentiate(
expr=m.product,
wrt=m.x,
mode=Modes.reverse_symbolic
)
print("Differentiation successful!")
diff_expr.pprint()
except Exception as e:
import traceback
traceback.print_exc()
PY
<|"|>}<tool_call|><|tool_response>
Turn 12at 433 s207 tokens out7,933 prompt tokens
Now let's verify the fix with the reproduction script again.
TOOL CALL · run_command
{
"command": "python3 - <<'PY'\nimport pyomo.environ as pyo\nfrom pyomo.core.expr.calculus.derivatives import Modes, differentiate\n\nm = pyo.ConcreteModel()\nm.x = pyo.Var(initialize=0)\n\n@m.Expression()\ndef y(blk):\n return 2\n\n@m.Expression()\ndef product(blk):\n return blk.x * blk.y\n\ntry:\n diff_expr = differentiate(\n expr=m.product,\n wrt=m.x,\n mode=Modes.reverse_symbolic\n )\n print(\"Differentiation successful!\")\n diff_expr.pprint()\nexcept Exception as e:\n import traceback\n traceback.print_exc()\nPY\n"
}Result of run_command 159 characters
{
"status": "ok",
"stdout": "Differentiation successful!\ny : Size=1, Index=None\n Key : Expression\n None : 2.0\n",
"stderr": "",
"exit_code": 0
}Generated tokens 207 tokens · stopped: STOP
Now let's verify the fix with the reproduction script again.
<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY'
import pyomo.environ as pyo
from pyomo.core.expr.calculus.derivatives import Modes, differentiate
m = pyo.ConcreteModel()
m.x = pyo.Var(initialize=0)
@m.Expression()
def y(blk):
return 2
@m.Expression()
def product(blk):
return blk.x * blk.y
try:
diff_expr = differentiate(
expr=m.product,
wrt=m.x,
mode=Modes.reverse_symbolic
)
print("Differentiation successful!")
diff_expr.pprint()
except Exception as e:
import traceback
traceback.print_exc()
PY
<|"|>}<tool_call|><|tool_response>
Patch, tests and logs
Final code change Included
diff --git a/pyomo/core/expr/calculus/diff_with_pyomo.py b/pyomo/core/expr/calculus/diff_with_pyomo.py
index 952e8ec..b1d5716 100644
--- a/pyomo/core/expr/calculus/diff_with_pyomo.py
+++ b/pyomo/core/expr/calculus/diff_with_pyomo.py
@@ -328,7 +328,8 @@ def _diff_GeneralExpression(node, val_dict, der_dict):
val_dict: ComponentMap
der_dict: ComponentMap
"""
- der_dict[node.expr] += der_dict[node]
+ if not is_constant(node.expr):
+ der_dict[node.expr] += der_dict[node]
def _diff_ExternalFunctionExpression(node, val_dict, der_dict):
Test output Included
============================= test session starts ============================== collected 29 items pyomo/core/tests/unit/test_derivs.py ...........s................s [100%] ==================================== PASSES ==================================== - generated xml file: /tmp/rebench-grade-8eb517c8bdd343e4980e5ee0dd6f72e7.xml -- =========================== short test summary info ============================ PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_NPV PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_abs PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_acos PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_asin PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_atan PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_constant_named_expressions PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_cos PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_div PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_duplicate_expressions PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_exp PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_expressiondata PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_linear_expression PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_log PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_log10 PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_multiple_named_expressions PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_nested PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_nested_named_expressions PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_pow PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_prod PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_sin PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_sqrt PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_sum PASSED pyomo/core/tests/unit/test_derivs.py::TestDerivs::test_tan PASSED pyomo/core/tests/unit/test_derivs.py::TestDifferentiate::test_bad_mode PASSED pyomo/core/tests/unit/test_derivs.py::TestDifferentiate::test_bad_wrt PASSED pyomo/core/tests/unit/test_derivs.py::TestDifferentiate::test_reverse_numeric PASSED pyomo/core/tests/unit/test_derivs.py::TestDifferentiate::test_reverse_symbolic SKIPPED [1] pyomo/core/tests/unit/test_derivs.py:259: Could not find the amplgsl.dll library SKIPPED [1] pyomo/core/tests/unit/test_derivs.py:327: test requires sympy ======================== 27 passed, 2 skipped in 0.55s =========================
Test errors Included
Test report (JUnit) Included
<?xml version="1.0" encoding="utf-8"?><testsuites name="pytest tests"><testsuite name="pytest" errors="0" failures="0" skipped="2" tests="29" time="0.549" timestamp="2026-11-14T05:04:23.612684+00:00" hostname="c4e3fa254e89"><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_NPV" time="0.001" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_abs" time="0.001" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_acos" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_asin" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_atan" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_constant_named_expressions" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_cos" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_div" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_duplicate_expressions" time="0.001" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_exp" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_expressiondata" time="0.001" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_external" time="0.009"><skipped type="pytest.skip" message="Could not find the amplgsl.dll library">/pyomo/pyomo/core/tests/unit/test_derivs.py:259: Could not find the amplgsl.dll library</skipped></testcase><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_linear_expression" time="0.001" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_log" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_log10" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_multiple_named_expressions" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_nested" time="0.001" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_nested_named_expressions" time="0.001" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_pow" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_prod" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_sin" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_sqrt" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_sum" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDerivs" name="test_tan" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDifferentiate" name="test_bad_mode" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDifferentiate" name="test_bad_wrt" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDifferentiate" name="test_reverse_numeric" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDifferentiate" name="test_reverse_symbolic" time="0.000" /><testcase classname="pyomo.core.tests.unit.test_derivs.TestDifferentiate" name="test_sympy" time="0.000"><skipped type="pytest.skip" message="test requires sympy">/pyomo/pyomo/core/tests/unit/test_derivs.py:327: test requires sympy</skipped></testcase></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 Pyomo/pyomo.
[ 28.9s] 💭 (1078 chars) "The user is reporting a `KeyError` when using Pyomo AD (`differentiate`) with `Expression`
components that have constant..."
[ 28.9s] 🔧 run_command (27 lines) python3 - <<'PY'
[ 29.5s] → error (exit 0):
[ 38.5s] 💭 (179 chars) "The reproduction failed because `pint` is not installed, and the reproduction script uses
`units=pyo.units.mol`. I shoul..."
[ 38.5s] 🔧 run_command (27 lines) python3 - <<'PY'
[ 38.7s] 🔧
[ 50.8s] 💭 (497 chars) "The bug is reproduced. The problematic line is `der_dict[node.expr] += der_dict[node]` in
`pyomo/core/expr/calculus/diff..."
[ 50.8s] 📖 read_file (pyomo/core/expr/calculus/diff_with_pyomo.py)
[ 50.9s] ✓ {'status': 'ok', 'filepath': 'pyomo/core/expr/calculus/diff_with_pyomo.py', 'content': ' val_dict:
ComponentMap\n …
[ 86.4s] 💭 (1371 chars) "The function `_diff_GeneralExpression` is:
```python
def _diff_GeneralExpression(node, val_dict, der_dict):
"""
..."
[ 86.4s] 📖 read_file (pyomo/common/collections/component_map.py)
[ 86.5s] ✓ {'status': 'ok', 'filepath': 'pyomo/common/collections/component_map.py', 'content': ' def
__str__(self):\n ""…
[ 136.2s] 💭 (1792 chars) "`ComponentMap` uses `id(obj)` as keys in `self._dict`.
In `_diff_GeneralExpression`, `der_dict[node.expr] += der_dict[no..."
[ 136.2s] 🔧 run_command (35 lines) python3 - <<'PY'
[ 136.4s] → node: product, node.expr: x*2, type(node.expr): <class 'pyomo.core.expr.numeric_expr.ProductExpression'>
[ 190.5s] 💭 (2440 chars) "The output shows:
`node: product, node.expr: x*2, type(node.expr): <class 'pyomo.core.expr.numeric_expr.ProductExpressio..."
[ 190.5s] 📖 read_file (pyomo/core/expr/numvalue.py)
[ 190.6s] ✓ {'status': 'ok', 'filepath': 'pyomo/core/expr/numvalue.py', 'content': '#
_____________________________________________…
[ 200.5s] 💭 (361 chars) "There is a utility function `is_constant(obj)` in `pyomo.core.expr.numvalue`.
Let's see if I can use `is_constant` to f..."
[ 200.5s] 📖 read_file (pyomo/core/expr/calculus/diff_with_pyomo.py)
[ 200.6s] ✓ {'status': 'ok', 'filepath': 'pyomo/core/expr/calculus/diff_with_pyomo.py', 'content': '#
_____________________________…
[ 233.1s] 💭 (534 chars) "`is_constant` is already imported from `pyomo.core.expr.numvalue` on line 8!
So I can just change `_diff_GeneralExpress..."
[ 233.1s] 🔧 run_command (48 lines) python3 - <<'PY'
[ 233.3s] → Differentiation successful!
[ 247.4s] 💭 (495 chars) "The differentiation was successful and the result is `2.0`, which is correct because
`product = x * 2`, and `d(product)/..."
[ 247.4s] 📖 read_file (pyomo/core/expr/calculus/diff_with_pyomo.py)
[ 247.4s] ✓ {'status': 'ok', 'filepath': 'pyomo/core/expr/calculus/diff_with_pyomo.py', 'content': '_diff_map =
dict()\n_diff_map[_e…
[ 316.6s] 💭 (2158 chars) "In `_reverse_diff_helper`:
```python
der_dict[expr] = 1
for e in reversed(expr_list):
if e.__class__ in ..."
[ 316.6s] 🔧 run_command (55 lines) python3 - <<'PY'
[ 316.8s] → der_dict after visitor: dict_keys([130929167799280, 130929185784080, 130929167866416, 130929167822528,
130929167875136])
[ 420.9s] 💭 (2867 chars) "Aha! Look at the output:
`Processing e: y, type: <class 'pyomo.core.base.expression.ScalarExpression'>`
`Calling _diff_G..."
[ 420.9s] ✏️ edit_file (pyomo/core/expr/calculus/diff_with_pyomo.py)
[ 421.1s] ✓ {'status': 'ok', 'filepath': 'pyomo/core/expr/calculus/diff_with_pyomo.py', 'occurrences': 1,
'strategy': 'unescaped', '…
[ 427.2s] 💭 (60 chars) "Now let's verify the fix with the reproduction script again."
[ 427.2s] 🔧 run_command (27 lines) python3 - <<'PY'
[ 427.4s] → Differentiation successful!
Native result row
{
"agent_error": "Agent exceeded session timeout (7.5 min)",
"duration_seconds": 460.17,
"error": "Agent exceeded session timeout (7.5 min)",
"grade": {
"collected_tests": 29,
"competition_junit_ok": true,
"error": null,
"required_issues_count": 0,
"resolved": true,
"status_counts": {
"PASSED": 27,
"SKIPPED": 2
},
"strict_clean_patch": true,
"test_exit_code": 0
},
"instance_id": "pyomo__pyomo-3017",
"pass_idx": 0,
"patch_chars": 568,
"phase1_seconds": 458.2,
"repo": "Pyomo/pyomo",
"request_log_path": "/kaggle-root/working/r31/rollouts_X/requests/pyomo__pyomo-3017__p0__r7.jsonl",
"resolved": true,
"rollout_idx": 7,
"run_key": "pyomo__pyomo-3017__p0__r7",
"strict_clean_patch": true,
"tool_calls": 12,
"total_llm_calls": 12,
"trace_path": "/kaggle-root/working/r31/rollouts_X/traces/trace_pyomo__pyomo-3017__p0__r7.json"
}