ROLLOUT 5 · Qiskit/qiskit-terra
qiskit__qiskit-terra-5833
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454 stotal time
11tool calls
11model calls
5,565tokens generated
104,350prompt tokens read
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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 10,333 characters
You are evaluating a software engineering task for repository Qiskit/qiskit-terra.
Problem Statement:
OptimizeSwapBeforeMeasure needs multiple invocations
The `OptimizeSwapBeforeMeasure` pass is supposed to commute quantum SWAP gates that immediately precede measurements, past the measurements, and instead convert them to classical swap (i.e.just retarget the measurement clbit).
However this should be generalized to work with any permutation that happens before the measurements, not just one swap layer. I made this work by invoking it many times for the example below, but really one invocation should be smart enough to remove all the swaps (that whole swap network should be modeled as a permutation).
```py
from qiskit import QuantumCircuit
from qiskit.transpiler.passes import OptimizeSwapBeforeMeasure, Depth, FixedPoint
from qiskit.transpiler import PassManager
circ = QuantumCircuit(8, 8)
circ.swap(3, 4)
circ.swap(6, 7)
circ.swap(0, 1)
circ.swap(6, 7)
circ.swap(4, 5)
circ.swap(0, 1)
circ.swap(5, 6)
circ.swap(3, 4)
circ.swap(1, 2)
circ.swap(6, 7)
circ.swap(4, 5)
circ.swap(2, 3)
circ.swap(0, 1)
circ.swap(5, 6)
circ.swap(1, 2)
circ.swap(6, 7)
circ.swap(4, 5)
circ.swap(2, 3)
circ.swap(3, 4)
circ.swap(3, 4)
circ.swap(5, 6)
circ.swap(1, 2)
circ.swap(4, 5)
circ.swap(2, 3)
circ.swap(5, 6)
circ.measure(range(8), range(8))
print(circ)
_depth_check = [Depth(), FixedPoint('depth')]
_opt = [OptimizeSwapBeforeMeasure()]
def _opt_control(property_set):
return not property_set['depth_fixed_point']
pm = PassManager()
pm.append(_depth_check + _opt, do_while=_opt_control) # should not need this do_while
print(pm.run(circ))
```
```
┌─┐
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q_1: ─X──X──X──X──X──╫─────X────┤M├─────────────────────
│ │ ║ │ └╥┘ ┌─┐
q_2: ───────X──X──X──╫──X──X─────╫──X────┤M├────────────
│ ║ │ ║ │ └╥┘┌─┐
q_3: ─X─────X──X─────╫──X──X──X──╫──X─────╫─┤M├─────────
│ │ ║ │ │ ║ ║ └╥┘┌─┐
q_4: ─X──X──X──X─────╫──X──X──X──╫──X─────╫──╫─┤M├──────
│ │ ║ │ ║ │ ║ ║ └╥┘┌─┐
q_5: ────X──X──X──X──╫──X──X─────╫──X──X──╫──╫──╫─┤M├───
│ │ ║ │ ║ │ ║ ║ ║ └╥┘┌─┐
q_6: ─X──X──X──X──X──╫──X──X─────╫─────X──╫──╫──╫──╫─┤M├
│ │ │ ║ │ ┌─┐ ║ ║ ║ ║ ║ └╥┘
q_7: ─X──X─────X─────╫──X─┤M├────╫────────╫──╫──╫──╫──╫─
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c: 8/════════════════╩═════╩═════╩════════╩══╩══╩══╩══╩═
0 7 1 2 3 4 5 6
┌─┐
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┌─┐└╥┘
q_1: ───┤M├─╫────────────────
┌─┐└╥┘ ║
q_2: ┤M├─╫──╫────────────────
└╥┘ ║ ║ ┌─┐
q_3: ─╫──╫──╫────┤M├─────────
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q_4: ─╫──╫──╫─────╫───────┤M├
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q_5: ─╫──╫──╫─┤M├─╫────────╫─
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q_6: ─╫──╫──╫──╫──╫─┤M├────╫─
║ ║ ║ ║ ║ └╥┘┌─┐ ║
q_7: ─╫──╫──╫──╫──╫──╫─┤M├─╫─
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c: 8/═╩══╩══╩══╩══╩══╩══╩══╩═
0 1 2 3 4 5 6 7
```
## 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):
```
./CODE_OF_CONDUCT.md
./CONTRIBUTING.md
./LICENSE.txt
./MANIFEST.in
./Make.bat
./Makefile
./README.md
./azure-pipelines.yml
./constraints.txt
./docs
./examples
./postBuild
./pyproject.toml
./qiskit
./qiskit/VERSION.txt
./qiskit/__init__.py
./qiskit/algorithms
./qiskit/algorithms/__init__.py
./qiskit/algorithms/algorithm_result.py
./qiskit/algorithms/amplitude_amplifiers
./qiskit/algorithms/amplitude_estimators
./qiskit/algorithms/eigen_solvers
./qiskit/algorithms/exceptions.py
./qiskit/algorithms/factorizers
./qiskit/algorithms/minimum_eigen_solvers
./qiskit/algorithms/optimizers
./qiskit/algorithms/variational_algorithm.py
./qiskit/algorithms/variational_forms
./qiskit/assembler
./qiskit/assembler/__init__.py
./qiskit/assembler/assemble_circuits.py
./qiskit/assembler/assemble_schedules.py
./qiskit/assembler/disassemble.py
./qiskit/assembler/run_config.py
./qiskit/circuit
./qiskit/circuit/__init__.py
./qiskit/circuit/_utils.py
./qiskit/circuit/add_control.py
./qiskit/circuit/barrier.py
./qiskit/circuit/bit.py
./qiskit/circuit/classicalfunction
./qiskit/circuit/classicalregister.py
./qiskit/circuit/controlledgate.py
./qiskit/circuit/delay.py
./qiskit/circuit/duration.py
./qiskit/circuit/equivalence.py
./qiskit/circuit/equivalence_library.py
./qiskit/circuit/exceptions.py
./qiskit/circuit/gate.py
./qiskit/circuit/instruction.py
./qiskit/circuit/instructionset.py
./qiskit/circuit/library
./qiskit/circuit/measure.py
./qiskit/circuit/parameter.py
./qiskit/circuit/parameterexpression.py
./qiskit/circuit/parametertable.py
./qiskit/circuit/parametervector.py
./qiskit/circuit/quantumcircuit.py
./qiskit/circuit/quantumcircuitdata.py
./qiskit/circuit/quantumregister.py
./qiskit/circuit/random
./qiskit/circuit/register.py
./qiskit/circuit/reset.py
./qiskit/circuit/tools
./qiskit/compiler
./qiskit/compiler/__init__.py
./qiskit/compiler/assembler.py
./qiskit/compiler/scheduler.py
./qiskit/compiler/sequencer.py
./qiskit/compiler/transpiler.py
./qiskit/converters
./qiskit/converters/__init__.py
./qiskit/converters/ast_to_dag.py
./qiskit/converters/circuit_to_dag.py
./qiskit/converters/circuit_to_dagdependency.py
./qiskit/converters/circuit_to_gate.py
./qiskit/converters/circuit_to_instruction.py
./qiskit/converters/dag_to_circuit.py
./qiskit/converters/dag_to_dagdependency.py
./qiskit/converters/dagdependency_to_circuit.py
./qiskit/converters/dagdependency_to_dag.py
./qiskit/dagcircuit
./qiskit/dagcircuit/__init__.py
./qiskit/dagcircuit/dagcircuit.py
./qiskit/dagcircuit/dagdependency.py
./qiskit/dagcircuit/dagdepnode.py
./qiskit/dagcircuit/dagnode.py
./qiskit/dagcircuit/exceptions.py
./qiskit/exceptions.py
./qiskit/execute_function.py
./qiskit/extensions
./qiskit/extensions/__init__.py
./qiskit/extensions/exceptions.py
./qiskit/extensions/hamiltonian_gate.py
./qiskit/extensions/quantum_initializer
./qiskit/extensions/simulator
./qiskit/extensions/unitary.py
./qiskit/opflow
./qiskit/opflow/__init__.py
./qiskit/opflow/converters
./qiskit/opflow/evolutions
./qiskit/opflow/exceptions.py
./qiskit/opflow/expectations
./qiskit/opflow/gradients
./qiskit/opflow/list_ops
./qiskit/opflow/operator_base.py
./qiskit/opflow/operator_globals.py
./qiskit/opflow/primitive_ops
./qiskit/opflow/state_fns
./qiskit/providers
./qiskit/providers/__init__.py
./qiskit/providers/backend.py
./qiskit/providers/basebackend.py
./qiskit/providers/basejob.py
./qiskit/providers/baseprovider.py
./qiskit/providers/basicaer
./qiskit/providers/exceptions.py
./qiskit/providers/job.py
./qiskit/providers/jobstatus.py
./qiskit/providers/models
./qiskit/providers/options.py
./qiskit/providers/provider.py
./qiskit/providers/providerutils.py
./qiskit/pulse
./qiskit/pulse/__init__.py
./qiskit/pulse/builder.py
./qiskit/pulse/channels.py
./qiskit/pulse/configuration.py
./qiskit/pulse/exceptions.py
./qiskit/pulse/instruction_schedule_map.py
./qiskit/pulse/instructions
./qiskit/pulse/interfaces.py
./qiskit/pulse/library
./qiskit/pulse/macros.py
./qiskit/pulse/parser.py
./qiskit/pulse/reschedule.py
./qiskit/pulse/schedule.py
./qiskit/pulse/transforms.py
./qiskit/pulse/utils.py
./qiskit/qasm
./qiskit/qasm/__init__.py
./qiskit/qasm/exceptions.py
./qiskit/qasm/libs
./qiskit/qasm/node
./qiskit/qasm/pygments
./qiskit/qasm/qasm.py
./qiskit/qasm/qasmlexer.py
./qiskit/qasm/qasmparser.py
./qiskit/qobj
./qiskit/qobj/__init__.py
./qiskit/qobj/common.py
./qiskit/qobj/converters
./qiskit/qobj/pulse_qobj.py
./qiskit/qobj/qasm_qobj.py
./qiskit/qobj/utils.py
./qiskit/quantum_info
./qiskit/quantum_info/__init__.py
./qiskit/quantum_info/analysis
./qiskit/quantum_info/operators
./qiskit/quantum_info/random.py
./qiskit/quantum_info/states
./qiskit/quantum_info/synthesis
./qiskit/result
./qiskit/result/__init__.py
./qiskit/result/counts.py
./qiskit/result/exceptions.py
./qiskit/result/models.py
./qiskit/result/postprocess.py
./qiskit/result/result.py
./qiskit/result/utils.py
./qiskit/scheduler
./qiskit/scheduler/__init__.py
./qiskit/schemas
./qiskit/test
./qiskit/tools
./qiskit/transpiler
./qiskit/user_config.py
./qiskit/util.py
./qiskit/utils
./qiskit/validation
./qiskit/version.py
./qiskit/visualization
./releasenotes
./releasenotes/config.yaml
./releasenotes/notes
./requirements-dev.txt
./requirements.txt
./setup.py
./test
./test/__init__.py
./test/ipynb
./test/python
./test/randomized
./tools
./tools/find_optional_imports.py
./tools/report_ci_failure.py
./tools/subunit_to_junit.py
./tools/update_fake_backends.py
./tools/verify_headers.py
./tox.ini
```
Turn 1at 16 s176 tokens out5,925 prompt tokens
The user is reporting an issue with `OptimizeSwapBeforeMeasure` pass in Qiskit's transpiler. The pass is supposed to commute SWAP gates that immediately precede measurements past the measurements by retargeting the measurement clbit. However, it seems it only works for a single layer of SWAPs and not for multiple layers (a permutation). I need to: 1. Locate `OptimizeSwapBeforeMeasure` implementation. 2. Reproduce the issue using the provided example. 3. Fix the implementation so that it can handle any permutation of SWAPs before measurements. 4. Verify the fix. Let's start by locating `OptimizeSwapBeforeMeasure`.
TOOL CALL · run_command
{
"command": "grep -rn --include=\"*.py\" \"class OptimizeSwapBeforeMeasure\" ."
}Result of run_command 189 characters
{
"status": "ok",
"stdout": "./qiskit/transpiler/passes/optimization/optimize_swap_before_measure.py:22:class OptimizeSwapBeforeMeasure(TransformationPass):\n",
"stderr": "",
"exit_code": 0
}Generated tokens 176 tokens · stopped: STOP
<|channel>thought
The user is reporting an issue with `OptimizeSwapBeforeMeasure` pass in Qiskit's transpiler.
The pass is supposed to commute SWAP gates that immediately precede measurements past the measurements by retargeting the measurement clbit.
However, it seems it only works for a single layer of SWAPs and not for multiple layers (a permutation).
I need to:
1. Locate `OptimizeSwapBeforeMeasure` implementation.
2. Reproduce the issue using the provided example.
3. Fix the implementation so that it can handle any permutation of SWAPs before measurements.
4. Verify the fix.
Let's start by locating `OptimizeSwapBeforeMeasure`.<channel|><|tool_call>call:run_command{command:<|"|>grep -rn --include="*.py" "class OptimizeSwapBeforeMeasure" .<|"|>}<tool_call|><|tool_response>
Turn 2at 41 s580 tokens out6,175 prompt tokens
Okay, the file is `qiskit/transpiler/passes/optimization/optimize_swap_before_measure.py`. Now I will create a reproduction script based on the example provided in the issue description.
TOOL CALL · run_command
{
"command": "cat <<'PY' > /tmp/repro.py\nfrom qiskit import QuantumCircuit\nfrom qiskit.transpiler.passes import OptimizeSwapBeforeMeasure, Depth, FixedPoint\nfrom qiskit.transpiler import PassManager\n\ncirc = QuantumCircuit(8, 8)\ncirc.swap(3, 4)\ncirc.swap(6, 7)\ncirc.swap(0, 1)\ncirc.swap(6, 7)\ncirc.swap(4, 5)\ncirc.swap(0, 1)\ncirc.swap(5, 6)\ncirc.swap(3, 4)\ncirc.swap(1, 2)\ncirc.swap(6, 7)\ncirc.swap(4, 5)\ncirc.swap(2, 3)\ncirc.swap(0, 1)\ncirc.swap(5, 6)\ncirc.swap(1, 2)\ncirc.swap(6, 7)\ncirc.swap(4, 5)\ncirc.swap(2, 3)\ncirc.swap(3, 4)\ncirc.swap(3, 4)\ncirc.swap(5, 6)\ncirc.swap(1, 2)\ncirc.swap(4, 5)\ncirc.swap(2, 3)\ncirc.swap(5, 6)\ncirc.measure(range(8), range(8))\n\nprint(\"--- Original circuit ---\")\nprint(circ)\n\n# Using do_while (current workaround)\n_depth_check = [Depth(), FixedPoint('depth')]\n_opt = [OptimizeSwapBeforeMeasure()]\ndef _opt_control(property_set):\n return not property_set['depth_fixed_point']\n\npm = PassManager()\npm.append(_depth_check + _opt, do_while=_opt_control)\nprint(\"\\n--- After PassManager with do_while ---\")\nprint(pm.run(circ))\n\n# Using a single pass (expected behavior)\npm_single = PassManager()\npm_single.append(OptimizeSwapBeforeMeasure())\nprint(\"\\n--- After a single OptimizeSwapBeforeMeasure pass ---\")\nprint(pm_single.run(circ))\nPY\npython3 /tmp/repro.py\n"
}Result of run_command 5,033 characters
{
"status": "error",
"error_type": "CommandError",
"error_message": "/qiskit-terra/qiskit/circuit/equivalence.py:18: DeprecationWarning: The retworkx package is deprecated and has been renamed to rustworkx. Rustworkx is a drop-in replacement and can be used by replacing `import retworkx` with import `rustworkx`. \n import retworkx as rx\n/qiskit-terra/qiskit/quantum_info/operators/operator.py:424: DeprecationWarning: __array__ implementation doesn't accept a copy keyword, so passing copy=False failed. __array__ must implement 'dtype' and 'copy' keyword arguments. To learn more, see the migration guide https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword\n return Operator(np.array(instruction, dtype=complex))\n/qiskit-terra/qiskit/version.py:20: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.\n import pkg_resources\nTraceback (most recent call last):\n File \"/tmp/repro.py\", line 1, in <module>\n from qiskit import QuantumCircuit\n File \"/qiskit-terra/qiskit/__init__.py\", line 53, in <module>\n from qiskit.execute_function import execute # noqa\n File \"/qiskit-terra/qiskit/execute_function.py\", line 24, in <module>\n from qiskit.compiler import transpile, assemble, schedule\n File \"/qiskit-terra/qiskit/compiler/__init__.py\", line 34, in <module>\n from .transpiler import transpile\n File \"/qiskit-terra/qiskit/compiler/transpiler.py\", line 35, in <module>\n from qiskit.transpiler.passes import ApplyLayout\n File \"/qiskit-terra/qiskit/transpiler/passes/__init__.py\", line 126, in <module>\n from .layout import SetLayout\n File \"/qiskit-terra/qiskit/transpiler/passes/layout/__init__.py\", line 19, in <module>\n from .sabre_layout import SabreLayout\n File \"/qiskit-terra/qiskit/transpiler/passes/layout/sabre_layout.py\", line 24, in <module>\n from qiskit.transpiler.passes.routing import SabreSwap\n File \"/qiskit-terra/qiskit/transpiler/passes/routing/__init__.py\", line 18, in <module>\n from .stochastic_swap import StochasticSwap\n File \"/qiskit-terra/qiskit/transpiler/passes/routing/stochastic_swap.py\", line 27, in <module>\n from .cython.stochastic_swap.utils import nlayout_from_layout\nModuleNotFoundError: No module named 'qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'\n",
"details": {
"stdout": "",
"stderr": "/qiskit-terra/qiskit/circuit/equivalence.py:18: DeprecationWarning: The retworkx package is deprecated and has been renamed to rustworkx. Rustworkx is a drop-in replacement and can be used by replacing `import retworkx` with import `rustworkx`. \n import retworkx as rx\n/qiskit-terra/qiskit/quantum_info/operators/operator.py:424: DeprecationWarning: __array__ implementation doesn't accept a copy keyword, so passing copy=False failed. __array__ must implement 'dtype' and 'copy' keyword arguments. To learn more, see the migration guide https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword\n return Operator(np.array(instruction, dtype=complex))\n/qiskit-terra/qiskit/version.py:20: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.\n import pkg_resources\nTraceback (most recent call last):\n File \"/tmp/repro.py\", line 1, in <module>\n from qiskit import QuantumCircuit\n File \"/qiskit-terra/qiskit/__init__.py\", line 53, in <module>\n from qiskit.execute_function import execute # noqa\n File \"/qiskit-terra/qiskit/execute_function.py\", line 24, in <module>\n from qiskit.compiler import transpile, assemble, schedule\n File \"/qiskit-terra/qiskit/compiler/__init__.py\", line 34, in <module>\n from .transpiler import transpile\n File \"/qiskit-terra/qiskit/compiler/transpiler.py\", line 35, in <module>\n from qiskit.transpiler.passes import ApplyLayout\n File \"/qiskit-terra/qiskit/transpiler/passes/__init__.py\", line 126, in <module>\n from .layout import SetLayout\n File \"/qiskit-terra/qiskit/transpiler/passes/layout/__init__.py\", line 19, in <module>\n from .sabre_layout import SabreLayout\n File \"/qiskit-terra/qiskit/transpiler/passes/layout/sabre_layout.py\", line 24, in <module>\n from qiskit.transpiler.passes.routing import SabreSwap\n File \"/qiskit-terra/qiskit/transpiler/passes/routing/__init__.py\", line 18, in <module>\n from .stochastic_swap import StochasticSwap\n File \"/qiskit-terra/qiskit/transpiler/passes/routing/stochastic_swap.py\", line 27, in <module>\n from .cython.stochastic_swap.utils import nlayout_from_layout\nModuleNotFoundError: No module named 'qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'\n",
"exit_code": 1
}
}Generated tokens 580 tokens · stopped: STOP
Okay, the file is `qiskit/transpiler/passes/optimization/optimize_swap_before_measure.py`.
Now I will create a reproduction script based on the example provided in the issue description.
<channel|><|tool_call>call:run_command{command:<|"|>cat <<'PY' > /tmp/repro.py
from qiskit import QuantumCircuit
from qiskit.transpiler.passes import OptimizeSwapBeforeMeasure, Depth, FixedPoint
from qiskit.transpiler import PassManager
circ = QuantumCircuit(8, 8)
circ.swap(3, 4)
circ.swap(6, 7)
circ.swap(0, 1)
circ.swap(6, 7)
circ.swap(4, 5)
circ.swap(0, 1)
circ.swap(5, 6)
circ.swap(3, 4)
circ.swap(1, 2)
circ.swap(6, 7)
circ.swap(4, 5)
circ.swap(2, 3)
circ.swap(0, 1)
circ.swap(5, 6)
circ.swap(1, 2)
circ.swap(6, 7)
circ.swap(4, 5)
circ.swap(2, 3)
circ.swap(3, 4)
circ.swap(3, 4)
circ.swap(5, 6)
circ.swap(1, 2)
circ.swap(4, 5)
circ.swap(2, 3)
circ.swap(5, 6)
circ.measure(range(8), range(8))
print("--- Original circuit ---")
print(circ)
# Using do_while (current workaround)
_depth_check = [Depth(), FixedPoint('depth')]
_opt = [OptimizeSwapBeforeMeasure()]
def _opt_control(property_set):
return not property_set['depth_fixed_point']
pm = PassManager()
pm.append(_depth_check + _opt, do_while=_opt_control)
print("\n--- After PassManager with do_while ---")
print(pm.run(circ))
# Using a single pass (expected behavior)
pm_single = PassManager()
pm_single.append(OptimizeSwapBeforeMeasure())
print("\n--- After a single OptimizeSwapBeforeMeasure pass ---")
print(pm_single.run(circ))
PY
python3 /tmp/repro.py
<|"|>}<tool_call|><|tool_response>
Turn 3at 54 s100 tokens out8,422 prompt tokens
Wait, I got a `ModuleNotFoundError: No module named 'qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'`. This is strange. I'm running inside the repository, and some cytochrome/compiled module seems to be missing. Let me check if the file exists in the filesystem.
TOOL CALL · run_command
{
"command": "find . -name \"stochastic_swap.utils*\""
}Result of run_command 60 characters
{
"status": "ok",
"stdout": "",
"stderr": "",
"exit_code": 0
}Generated tokens 100 tokens · stopped: STOP
Wait, I got a `ModuleNotFoundError: No module named 'qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'`.
This is strange. I'm running inside the repository, and some cytochrome/compiled module seems to be missing.
Let me check if the file exists in the filesystem.
<channel|><|tool_call>call:run_command{command:<|"|>find . -name "stochastic_swap.utils*"<|"|>}<tool_call|><|tool_response>
Turn 4at 108 s971 tokens out8,559 prompt tokens
It seems the cython extensions are not built. That's a problem for running the full `qiskit` imports if they depend on them. However, I am only testing `OptimizeSwapBeforeMeasure`. Maybe I can import the necessary classes directly without going through `qiskit` top level if that's what triggers the issue. Actually, `from qiskit import QuantumCircuit` and `from qiskit.transpiler.passes import OptimizeSwapBeforeMeasure` are used. Let's see where `QuantumCircuit` is defined. It is in `qiskit/circuit/quantumcircuit.py`. Let's see where `OptimizeSwapBeforeMeasure` is defined. It is in `qiskit/transpiler/passes/optimization/optimize_swap_before_measure.py`. If I can avoid importing `qiskit` (the package), maybe I can avoid the broken imports. But `QuantumCircuit` is part of the core. Wait, the error happened at: `from qiskit import QuantumCircuit` -> `qiskit/__init__.py` -> `qiskit/execute_function.py` -> `qiskit/compiler/__init__.py` -> `qiskit/compiler/transpiler.py` -> `qiskit/transpiler/passes/__init__.py` -> `qiskit/transpiler/passes/layout/__init__.py` -> `qiskit/transpiler/passes/layout/sabre_layout.py` -> `qiskit/transpiler/passes/routing/__init__.py` -> `qiskit/transpiler/passes/routing/stochastic_swap.py` -> `from .cython.stochastic_swap.utils import nlayout_from_layout` So `qiskit/__init__.py` is doing a lot of eager imports. I should try to import `QuantumCircuit` and `OptimizeSwapBeforeMeasure` directly from their modules.
TOOL CALL · run_command
{
"command": "cat <<'PY' > /tmp/repro.py\nfrom qiskit.circuit.quantumcircuit import QuantumCircuit\nfrom qiskit.transpiler.passes.optimization.optimize_swap_before_measure import OptimizeSwapBeforeMeasure\nfrom qiskit.dagconverter.circuittodag import CircuitToDAG\nfrom qiskit.dagconverter.dagtocircuit import DAGToCircuit\nfrom qiskit.transpiler.PassManager import PassManager\n\ncirc = QuantumCircuit(8, 8)\ncirc.swap(3, 4)\ncirc.swap(6, 7)\ncirc.swap(0, 1)\ncirc.swap(6, 7)\ncirc.swap(4, 5)\ncirc.swap(0, 1)\ncirc.swap(5, 6)\ncirc.swap(3, 4)\ncirc.swap(1, 2)\ncirc.swap(6, 7)\ncirc.swap(4, 5)\ncirc.swap(2, 3)\ncirc.swap(0, 1)\ncirc.swap(5, 6)\ncirc.swap(1, 2)\ncirc.swap(6, 7)\ncirc.swap(4, 5)\ncirc.swap(2, 3)\ncirc.swap(3, 4)\ncirc.swap(3, 4)\ncirc.swap(5, 6)\ncirc.swap(1, 2)\ncirc.swap(4, 5)\ncirc.swap(2, 3)\ncirc.swap(5, 6)\ncirc.measure(range(8), range(8))\n\nprint(\"--- Original circuit ---\")\nprint(circ)\n\n# Using a single pass\npass_obj = OptimizeSwapBeforeMeasure()\n# TransformationPass takes a DAG and returns a DAG.\n# PassManager also does this.\n\npm_single = PassManager()\npm_single.append(pass_obj)\nresult_circ = pm_single.run(circ)\nprint(\"\\n--- After a single OptimizeSwapBeforeMeasure pass ---\")\nprint(result_circ)\n\n# Check if all SWAPs are gone before measurements\n# We can check the depth of the circuit or just print it.\nPY\npython3 /tmp/repro.py\n"
}Result of run_command 5,079 characters
{
"status": "error",
"error_type": "CommandError",
"error_message": "/qiskit-terra/qiskit/circuit/equivalence.py:18: DeprecationWarning: The retworkx package is deprecated and has been renamed to rustworkx. Rustworkx is a drop-in replacement and can be used by replacing `import retworkx` with import `rustworkx`. \n import retworkx as rx\n/qiskit-terra/qiskit/quantum_info/operators/operator.py:424: DeprecationWarning: __array__ implementation doesn't accept a copy keyword, so passing copy=False failed. __array__ must implement 'dtype' and 'copy' keyword arguments. To learn more, see the migration guide https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword\n return Operator(np.array(instruction, dtype=complex))\n/qiskit-terra/qiskit/version.py:20: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.\n import pkg_resources\nTraceback (most recent call last):\n File \"/tmp/repro.py\", line 1, in <module>\n from qiskit.circuit.quantumcircuit import QuantumCircuit\n File \"/qiskit-terra/qiskit/__init__.py\", line 53, in <module>\n from qiskit.execute_function import execute # noqa\n File \"/qiskit-terra/qiskit/execute_function.py\", line 24, in <module>\n from qiskit.compiler import transpile, assemble, schedule\n File \"/qiskit-terra/qiskit/compiler/__init__.py\", line 34, in <module>\n from .transpiler import transpile\n File \"/qiskit-terra/qiskit/compiler/transpiler.py\", line 35, in <module>\n from qiskit.transpiler.passes import ApplyLayout\n File \"/qiskit-terra/qiskit/transpiler/passes/__init__.py\", line 126, in <module>\n from .layout import SetLayout\n File \"/qiskit-terra/qiskit/transpiler/passes/layout/__init__.py\", line 19, in <module>\n from .sabre_layout import SabreLayout\n File \"/qiskit-terra/qiskit/transpiler/passes/layout/sabre_layout.py\", line 24, in <module>\n from qiskit.transpiler.passes.routing import SabreSwap\n File \"/qiskit-terra/qiskit/transpiler/passes/routing/__init__.py\", line 18, in <module>\n from .stochastic_swap import StochasticSwap\n File \"/qiskit-terra/qiskit/transpiler/passes/routing/stochastic_swap.py\", line 27, in <module>\n from .cython.stochastic_swap.utils import nlayout_from_layout\nModuleNotFoundError: No module named 'qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'\n",
"details": {
"stdout": "",
"stderr": "/qiskit-terra/qiskit/circuit/equivalence.py:18: DeprecationWarning: The retworkx package is deprecated and has been renamed to rustworkx. Rustworkx is a drop-in replacement and can be used by replacing `import retworkx` with import `rustworkx`. \n import retworkx as rx\n/qiskit-terra/qiskit/quantum_info/operators/operator.py:424: DeprecationWarning: __array__ implementation doesn't accept a copy keyword, so passing copy=False failed. __array__ must implement 'dtype' and 'copy' keyword arguments. To learn more, see the migration guide https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword\n return Operator(np.array(instruction, dtype=complex))\n/qiskit-terra/qiskit/version.py:20: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.\n import pkg_resources\nTraceback (most recent call last):\n File \"/tmp/repro.py\", line 1, in <module>\n from qiskit.circuit.quantumcircuit import QuantumCircuit\n File \"/qiskit-terra/qiskit/__init__.py\", line 53, in <module>\n from qiskit.execute_function import execute # noqa\n File \"/qiskit-terra/qiskit/execute_function.py\", line 24, in <module>\n from qiskit.compiler import transpile, assemble, schedule\n File \"/qiskit-terra/qiskit/compiler/__init__.py\", line 34, in <module>\n from .transpiler import transpile\n File \"/qiskit-terra/qiskit/compiler/transpiler.py\", line 35, in <module>\n from qiskit.transpiler.passes import ApplyLayout\n File \"/qiskit-terra/qiskit/transpiler/passes/__init__.py\", line 126, in <module>\n from .layout import SetLayout\n File \"/qiskit-terra/qiskit/transpiler/passes/layout/__init__.py\", line 19, in <module>\n from .sabre_layout import SabreLayout\n File \"/qiskit-terra/qiskit/transpiler/passes/layout/sabre_layout.py\", line 24, in <module>\n from qiskit.transpiler.passes.routing import SabreSwap\n File \"/qiskit-terra/qiskit/transpiler/passes/routing/__init__.py\", line 18, in <module>\n from .stochastic_swap import StochasticSwap\n File \"/qiskit-terra/qiskit/transpiler/passes/routing/stochastic_swap.py\", line 27, in <module>\n from .cython.stochastic_swap.utils import nlayout_from_layout\nModuleNotFoundError: No module named 'qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'\n",
"exit_code": 1
}
}Generated tokens 971 tokens · stopped: STOP
It seems the cython extensions are not built. That's a problem for running the full `qiskit` imports if they depend on them.
However, I am only testing `OptimizeSwapBeforeMeasure`. Maybe I can import the necessary classes directly without going through `qiskit` top level if that's what triggers the issue.
Actually, `from qiskit import QuantumCircuit` and `from qiskit.transpiler.passes import OptimizeSwapBeforeMeasure` are used.
Let's see where `QuantumCircuit` is defined. It is in `qiskit/circuit/quantumcircuit.py`.
Let's see where `OptimizeSwapBeforeMeasure` is defined. It is in `qiskit/transpiler/passes/optimization/optimize_swap_before_measure.py`.
If I can avoid importing `qiskit` (the package), maybe I can avoid the broken imports. But `QuantumCircuit` is part of the core.
Wait, the error happened at:
`from qiskit import QuantumCircuit`
-> `qiskit/__init__.py`
-> `qiskit/execute_function.py`
-> `qiskit/compiler/__init__.py`
-> `qiskit/compiler/transpiler.py`
-> `qiskit/transpiler/passes/__init__.py`
-> `qiskit/transpiler/passes/layout/__init__.py`
-> `qiskit/transpiler/passes/layout/sabre_layout.py`
-> `qiskit/transpiler/passes/routing/__init__.py`
-> `qiskit/transpiler/passes/routing/stochastic_swap.py`
-> `from .cython.stochastic_swap.utils import nlayout_from_layout`
So `qiskit/__init__.py` is doing a lot of eager imports.
I should try to import `QuantumCircuit` and `OptimizeSwapBeforeMeasure` directly from their modules.
<channel|><|tool_call>call:run_command{command:<|"|>cat <<'PY' > /tmp/repro.py
from qiskit.circuit.quantumcircuit import QuantumCircuit
from qiskit.transpiler.passes.optimization.optimize_swap_before_measure import OptimizeSwapBeforeMeasure
from qiskit.dagconverter.circuittodag import CircuitToDAG
from qiskit.dagconverter.dagtocircuit import DAGToCircuit
from qiskit.transpiler.PassManager import PassManager
circ = QuantumCircuit(8, 8)
circ.swap(3, 4)
circ.swap(6, 7)
circ.swap(0, 1)
circ.swap(6, 7)
circ.swap(4, 5)
circ.swap(0, 1)
circ.swap(5, 6)
circ.swap(3, 4)
circ.swap(1, 2)
circ.swap(6, 7)
circ.swap(4, 5)
circ.swap(2, 3)
circ.swap(0, 1)
circ.swap(5, 6)
circ.swap(1, 2)
circ.swap(6, 7)
circ.swap(4, 5)
circ.swap(2, 3)
circ.swap(3, 4)
circ.swap(3, 4)
circ.swap(5, 6)
circ.swap(1, 2)
circ.swap(4, 5)
circ.swap(2, 3)
circ.swap(5, 6)
circ.measure(range(8), range(8))
print("--- Original circuit ---")
print(circ)
# Using a single pass
pass_obj = OptimizeSwapBeforeMeasure()
# TransformationPass takes a DAG and returns a DAG.
# PassManager also does this.
pm_single = PassManager()
pm_single.append(pass_obj)
result_circ = pm_single.run(circ)
print("\n--- After a single OptimizeSwapBeforeMeasure pass ---")
print(result_circ)
# Check if all SWAPs are gone before measurements
# We can check the depth of the circuit or just print it.
PY
python3 /tmp/repro.py
<|"|>}<tool_call|><|tool_response>
Turn 5at 157 s582 tokens out11,209 prompt tokens
Wait, it seems that even `from qiskit.circuit.quantumcircuit import QuantumCircuit` is triggering `from qiskit/__init__.py`? No, it shouldn't.
Wait, if I do `from qiskit.circuit.quantumcircuit import QuantumCircuit`, Python should not import `qiskit/__init__.py` unless `qiskit` package itself is imported or something in `qiskit.circuit.quantumcircuit` does.
Let's check `qiskit/circuit/quantumcircuit.py` to see if it imports `qiskit`.
Actually, if I have a folder structure like:
qiskit/
__init__.py
circuit/
__init__.py
quantumcircuit.py
`from qiskit.circuit.quantumcircuit import QuantumCircuit` should only load `qiskit/__init__.py` if `qiskit` is part of the import path and it's being treated as a package.
Wait, if I am in `/workspace` and I do `python3 ...`, and there is a `qiskit` folder in `/workspace`, then `from qiskit...` will definitely trigger `qiskit/__init__.py` because `qiskit` is the top level package.
To avoid `qiskit/__init__.py`, I might need to remove it or move it, but that's not a good idea.
Actually, I can tell Python to ignore the current directory for some imports, or use a different way.
But the real problem is that the environment is missing the cython extensions.
Wait, if I just want to test `OptimizeSwapBeforeMeasure`, I can use `CircuitToDAG` and then call the pass on the DAG.
Let's try to find a way to run the code without importing the top-level `qiskit` if possible, or just bypass the broken part.
Actually, the `sabre_layout.py` is the one importing the cython module.
I can try to mock the cython module.
But a better way might be to just run the fix and verify it using `pytest` if the tests don't all import everything.
Wait, if I want to run a reproduction script, I can't have it fail on import.
Let me try to see if I can just import the classes I need and if they trigger the failure.
```bash
python3 -c "from qiskit.circuit.quantumcircuit import QuantumCircuit; print('ok')"
```
TOOL CALL · run_command
{
"command": "python3 -c \"from qiskit.circuit.quantumcircuit import QuantumCircuit; print('ok')\""
}Result of run_command 4,873 characters
{
"status": "error",
"error_type": "CommandError",
"error_message": "/workspace/qiskit/circuit/equivalence.py:18: DeprecationWarning: The retworkx package is deprecated and has been renamed to rustworkx. Rustworkx is a drop-in replacement and can be used by replacing `import retworkx` with import `rustworkx`. \n import retworkx as rx\n/workspace/qiskit/quantum_info/operators/operator.py:424: DeprecationWarning: __array__ implementation doesn't accept a copy keyword, so passing copy=False failed. __array__ must implement 'dtype' and 'copy' keyword arguments. To learn more, see the migration guide https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword\n return Operator(np.array(instruction, dtype=complex))\n/workspace/qiskit/version.py:20: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.\n import pkg_resources\nTraceback (most recent call last):\n File \"<string>\", line 1, in <module>\n File \"/workspace/qiskit/__init__.py\", line 53, in <module>\n from qiskit.execute_function import execute # noqa\n File \"/workspace/qiskit/execute_function.py\", line 24, in <module>\n from qiskit.compiler import transpile, assemble, schedule\n File \"/workspace/qiskit/compiler/__init__.py\", line 34, in <module>\n from .transpiler import transpile\n File \"/workspace/qiskit/compiler/transpiler.py\", line 35, in <module>\n from qiskit.transpiler.passes import ApplyLayout\n File \"/workspace/qiskit/transpiler/passes/__init__.py\", line 126, in <module>\n from .layout import SetLayout\n File \"/workspace/qiskit/transpiler/passes/layout/__init__.py\", line 19, in <module>\n from .sabre_layout import SabreLayout\n File \"/workspace/qiskit/transpiler/passes/layout/sabre_layout.py\", line 24, in <module>\n from qiskit.transpiler.passes.routing import SabreSwap\n File \"/workspace/qiskit/transpiler/passes/routing/__init__.py\", line 18, in <module>\n from .stochastic_swap import StochasticSwap\n File \"/workspace/qiskit/transpiler/passes/routing/stochastic_swap.py\", line 27, in <module>\n from .cython.stochastic_swap.utils import nlayout_from_layout\nModuleNotFoundError: No module named 'qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'\n",
"details": {
"stdout": "",
"stderr": "/workspace/qiskit/circuit/equivalence.py:18: DeprecationWarning: The retworkx package is deprecated and has been renamed to rustworkx. Rustworkx is a drop-in replacement and can be used by replacing `import retworkx` with import `rustworkx`. \n import retworkx as rx\n/workspace/qiskit/quantum_info/operators/operator.py:424: DeprecationWarning: __array__ implementation doesn't accept a copy keyword, so passing copy=False failed. __array__ must implement 'dtype' and 'copy' keyword arguments. To learn more, see the migration guide https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword\n return Operator(np.array(instruction, dtype=complex))\n/workspace/qiskit/version.py:20: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.\n import pkg_resources\nTraceback (most recent call last):\n File \"<string>\", line 1, in <module>\n File \"/workspace/qiskit/__init__.py\", line 53, in <module>\n from qiskit.execute_function import execute # noqa\n File \"/workspace/qiskit/execute_function.py\", line 24, in <module>\n from qiskit.compiler import transpile, assemble, schedule\n File \"/workspace/qiskit/compiler/__init__.py\", line 34, in <module>\n from .transpiler import transpile\n File \"/workspace/qiskit/compiler/transpiler.py\", line 35, in <module>\n from qiskit.transpiler.passes import ApplyLayout\n File \"/workspace/qiskit/transpiler/passes/__init__.py\", line 126, in <module>\n from .layout import SetLayout\n File \"/workspace/qiskit/transpiler/passes/layout/__init__.py\", line 19, in <module>\n from .sabre_layout import SabreLayout\n File \"/workspace/qiskit/transpiler/passes/layout/sabre_layout.py\", line 24, in <module>\n from qiskit.transpiler.passes.routing import SabreSwap\n File \"/workspace/qiskit/transpiler/passes/routing/__init__.py\", line 18, in <module>\n from .stochastic_swap import StochasticSwap\n File \"/workspace/qiskit/transpiler/passes/routing/stochastic_swap.py\", line 27, in <module>\n from .cython.stochastic_swap.utils import nlayout_from_layout\nModuleNotFoundError: No module named 'qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'\n",
"exit_code": 1
}
}Generated tokens 582 tokens · stopped: STOP
Wait, it seems that even `from qiskit.circuit.quantumcircuit import QuantumCircuit` is triggering `from qiskit/__init__.py`? No, it shouldn't.
Wait, if I do `from qiskit.circuit.quantumcircuit import QuantumCircuit`, Python should not import `qiskit/__init__.py` unless `qiskit` package itself is imported or something in `qiskit.circuit.quantumcircuit` does.
Let's check `qiskit/circuit/quantumcircuit.py` to see if it imports `qiskit`.
Actually, if I have a folder structure like:
qiskit/
__init__.py
circuit/
__init__.py
quantumcircuit.py
`from qiskit.circuit.quantumcircuit import QuantumCircuit` should only load `qiskit/__init__.py` if `qiskit` is part of the import path and it's being treated as a package.
Wait, if I am in `/workspace` and I do `python3 ...`, and there is a `qiskit` folder in `/workspace`, then `from qiskit...` will definitely trigger `qiskit/__init__.py` because `qiskit` is the top level package.
To avoid `qiskit/__init__.py`, I might need to remove it or move it, but that's not a good idea.
Actually, I can tell Python to ignore the current directory for some imports, or use a different way.
But the real problem is that the environment is missing the cython extensions.
Wait, if I just want to test `OptimizeSwapBeforeMeasure`, I can use `CircuitToDAG` and then call the pass on the DAG.
Let's try to find a way to run the code without importing the top-level `qiskit` if possible, or just bypass the broken part.
Actually, the `sabre_layout.py` is the one importing the cython module.
I can try to mock the cython module.
But a better way might be to just run the fix and verify it using `pytest` if the tests don't all import everything.
Wait, if I want to run a reproduction script, I can't have it fail on import.
Let me try to see if I can just import the classes I need and if they trigger the failure.
```bash
python3 -c "from qiskit.circuit.quantumcircuit import QuantumCircuit; print('ok')"
```
<channel|><|tool_call>call:run_command{command:<|"|>python3 -c "from qiskit.circuit.quantumcircuit import QuantumCircuit; print('ok')"<|"|>}<tool_call|><|tool_response>
Turn 6at 176 s277 tokens out13,334 prompt tokens
Wait, the `qiskit/__init__.py` is definitely being executed because it's in the traceback: `File "/workspace/qiskit/__init__.py", line 53, in <module>` This is because `qiskit` is in the current working directory, and when I do `from qiskit.circuit.quantumcircuit import QuantumCircuit`, it loads the `qiskit` package from the current directory. I can try to workaround this by adding the current directory's parent to `PYTHONPATH` and removing the current directory from it, or by using a different approach. Or, I can just mock the missing module. Let's try to mock `qiskit.transpiler.passes.routing.cython.stochastic_swap.utils`.
TOOL CALL · run_command
{
"command": "cat <<'PY' > /tmp/fix_imports.py\nimport sys\nfrom types import ModuleType\n\nm = ModuleType('qiskit.transpiler.passes.routing.cython.stochastic_swap.utils')\nsys.modules['qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'] = m\n# also might need for others\nPY\n"
}Result of run_command 60 characters
{
"status": "ok",
"stdout": "",
"stderr": "",
"exit_code": 0
}Generated tokens 277 tokens · stopped: STOP
Wait, the `qiskit/__init__.py` is definitely being executed because it's in the traceback:
`File "/workspace/qiskit/__init__.py", line 53, in <module>`
This is because `qiskit` is in the current working directory, and when I do `from qiskit.circuit.quantumcircuit import QuantumCircuit`, it loads the `qiskit` package from the current directory.
I can try to workaround this by adding the current directory's parent to `PYTHONPATH` and removing the current directory from it, or by using a different approach.
Or, I can just mock the missing module.
Let's try to mock `qiskit.transpiler.passes.routing.cython.stochastic_swap.utils`.
<channel|><|tool_call>call:run_command{command:<|"|>cat <<'PY' > /tmp/fix_imports.py
import sys
from types import ModuleType
m = ModuleType('qiskit.transpiler.passes.routing.cython.stochastic_swap.utils')
sys.modules['qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'] = m
# also might need for others
PY
<|"|>}<tool_call|><|tool_response>
Turn 7at 182 s128 tokens out13,648 prompt tokens
Now let's try to run a script that imports the mock first.
TOOL CALL · run_command
{
"command": "python3 - <<'PY'\nimport sys\nfrom types import ModuleType\nm = ModuleType('qiskit.transpiler.passes.routing.cython.stochastic_swap.utils')\nsys.modules['qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'] = m\n\nfrom qiskit.circuit.quantumcircuit import QuantumCircuit\nprint('QuantumCircuit imported successfully')\nPY\n"
}Result of run_command 4,953 characters
{
"status": "error",
"error_type": "CommandError",
"error_message": "/workspace/qiskit/circuit/equivalence.py:18: DeprecationWarning: The retworkx package is deprecated and has been renamed to rustworkx. Rustworkx is a drop-in replacement and can be used by replacing `import retworkx` with import `rustworkx`. \n import retworkx as rx\n/workspace/qiskit/quantum_info/operators/operator.py:424: DeprecationWarning: __array__ implementation doesn't accept a copy keyword, so passing copy=False failed. __array__ must implement 'dtype' and 'copy' keyword arguments. To learn more, see the migration guide https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword\n return Operator(np.array(instruction, dtype=complex))\n/workspace/qiskit/version.py:20: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.\n import pkg_resources\nTraceback (most recent call last):\n File \"<stdin>\", line 6, in <module>\n File \"/workspace/qiskit/__init__.py\", line 53, in <module>\n from qiskit.execute_function import execute # noqa\n File \"/workspace/qiskit/execute_function.py\", line 24, in <module>\n from qiskit.compiler import transpile, assemble, schedule\n File \"/workspace/qiskit/compiler/__init__.py\", line 34, in <module>\n from .transpiler import transpile\n File \"/workspace/qiskit/compiler/transpiler.py\", line 35, in <module>\n from qiskit.transpiler.passes import ApplyLayout\n File \"/workspace/qiskit/transpiler/passes/__init__.py\", line 126, in <module>\n from .layout import SetLayout\n File \"/workspace/qiskit/transpiler/passes/layout/__init__.py\", line 19, in <module>\n from .sabre_layout import SabreLayout\n File \"/workspace/qiskit/transpiler/passes/layout/sabre_layout.py\", line 24, in <module>\n from qiskit.transpiler.passes.routing import SabreSwap\n File \"/workspace/qiskit/transpiler/passes/routing/__init__.py\", line 18, in <module>\n from .stochastic_swap import StochasticSwap\n File \"/workspace/qiskit/transpiler/passes/routing/stochastic_swap.py\", line 27, in <module>\n from .cython.stochastic_swap.utils import nlayout_from_layout\nImportError: cannot import name 'nlayout_from_layout' from 'qiskit.transpiler.passes.routing.cython.stochastic_swap.utils' (unknown location)\n",
"details": {
"stdout": "",
"stderr": "/workspace/qiskit/circuit/equivalence.py:18: DeprecationWarning: The retworkx package is deprecated and has been renamed to rustworkx. Rustworkx is a drop-in replacement and can be used by replacing `import retworkx` with import `rustworkx`. \n import retworkx as rx\n/workspace/qiskit/quantum_info/operators/operator.py:424: DeprecationWarning: __array__ implementation doesn't accept a copy keyword, so passing copy=False failed. __array__ must implement 'dtype' and 'copy' keyword arguments. To learn more, see the migration guide https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword\n return Operator(np.array(instruction, dtype=complex))\n/workspace/qiskit/version.py:20: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.\n import pkg_resources\nTraceback (most recent call last):\n File \"<stdin>\", line 6, in <module>\n File \"/workspace/qiskit/__init__.py\", line 53, in <module>\n from qiskit.execute_function import execute # noqa\n File \"/workspace/qiskit/execute_function.py\", line 24, in <module>\n from qiskit.compiler import transpile, assemble, schedule\n File \"/workspace/qiskit/compiler/__init__.py\", line 34, in <module>\n from .transpiler import transpile\n File \"/workspace/qiskit/compiler/transpiler.py\", line 35, in <module>\n from qiskit.transpiler.passes import ApplyLayout\n File \"/workspace/qiskit/transpiler/passes/__init__.py\", line 126, in <module>\n from .layout import SetLayout\n File \"/workspace/qiskit/transpiler/passes/layout/__init__.py\", line 19, in <module>\n from .sabre_layout import SabreLayout\n File \"/workspace/qiskit/transpiler/passes/layout/sabre_layout.py\", line 24, in <module>\n from qiskit.transpiler.passes.routing import SabreSwap\n File \"/workspace/qiskit/transpiler/passes/routing/__init__.py\", line 18, in <module>\n from .stochastic_swap import StochasticSwap\n File \"/workspace/qiskit/transpiler/passes/routing/stochastic_swap.py\", line 27, in <module>\n from .cython.stochastic_swap.utils import nlayout_from_layout\nImportError: cannot import name 'nlayout_from_layout' from 'qiskit.transpiler.passes.routing.cython.stochastic_swap.utils' (unknown location)\n",
"exit_code": 1
}
}Generated tokens 128 tokens · stopped: STOP
Now let's try to run a script that imports the mock first.
<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY'
import sys
from types import ModuleType
m = ModuleType('qiskit.transpiler.passes.routing.cython.stochastic_swap.utils')
sys.modules['qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'] = m
from qiskit.circuit.quantumcircuit import QuantumCircuit
print('QuantumCircuit imported successfully')
PY
<|"|>}<tool_call|><|tool_response>
Turn 8at 198 s247 tokens out15,345 prompt tokens
It's failing because it's trying to import `nlayout_from_layout` from the mocked module. I can just add that as an attribute to the mocked module.
```python
m = ModuleType('qiskit.transpiler.passes.routing.cython.stochastic_swap.utils')
m.nlayout_from_layout = lambda x: x
sys.modules['qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'] = m
```
Let's try this.
TOOL CALL · run_command
{
"command": "python3 - <<'PY'\nimport sys\nfrom types import ModuleType\nm = ModuleType('qiskit.transpiler.passes.routing.cython.stochastic_swap.utils')\nm.nlayout_from_layout = lambda x: x\nsys.modules['qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'] = m\n\nfrom qiskit.circuit.quantumcircuit import QuantumCircuit\nprint('QuantumCircuit imported successfully')\nPY\n"
}Result of run_command 4,873 characters
{
"status": "error",
"error_type": "CommandError",
"error_message": "/workspace/qiskit/circuit/equivalence.py:18: DeprecationWarning: The retworkx package is deprecated and has been renamed to rustworkx. Rustworkx is a drop-in replacement and can be used by replacing `import retworkx` with import `rustworkx`. \n import retworkx as rx\n/workspace/qiskit/quantum_info/operators/operator.py:424: DeprecationWarning: __array__ implementation doesn't accept a copy keyword, so passing copy=False failed. __array__ must implement 'dtype' and 'copy' keyword arguments. To learn more, see the migration guide https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword\n return Operator(np.array(instruction, dtype=complex))\n/workspace/qiskit/version.py:20: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.\n import pkg_resources\nTraceback (most recent call last):\n File \"<stdin>\", line 7, in <module>\n File \"/workspace/qiskit/__init__.py\", line 53, in <module>\n from qiskit.execute_function import execute # noqa\n File \"/workspace/qiskit/execute_function.py\", line 24, in <module>\n from qiskit.compiler import transpile, assemble, schedule\n File \"/workspace/qiskit/compiler/__init__.py\", line 34, in <module>\n from .transpiler import transpile\n File \"/workspace/qiskit/compiler/transpiler.py\", line 35, in <module>\n from qiskit.transpiler.passes import ApplyLayout\n File \"/workspace/qiskit/transpiler/passes/__init__.py\", line 126, in <module>\n from .layout import SetLayout\n File \"/workspace/qiskit/transpiler/passes/layout/__init__.py\", line 19, in <module>\n from .sabre_layout import SabreLayout\n File \"/workspace/qiskit/transpiler/passes/layout/sabre_layout.py\", line 24, in <module>\n from qiskit.transpiler.passes.routing import SabreSwap\n File \"/workspace/qiskit/transpiler/passes/routing/__init__.py\", line 18, in <module>\n from .stochastic_swap import StochasticSwap\n File \"/workspace/qiskit/transpiler/passes/routing/stochastic_swap.py\", line 29, in <module>\n from .cython.stochastic_swap.swap_trial import swap_trial\nModuleNotFoundError: No module named 'qiskit.transpiler.passes.routing.cython.stochastic_swap.swap_trial'\n",
"details": {
"stdout": "",
"stderr": "/workspace/qiskit/circuit/equivalence.py:18: DeprecationWarning: The retworkx package is deprecated and has been renamed to rustworkx. Rustworkx is a drop-in replacement and can be used by replacing `import retworkx` with import `rustworkx`. \n import retworkx as rx\n/workspace/qiskit/quantum_info/operators/operator.py:424: DeprecationWarning: __array__ implementation doesn't accept a copy keyword, so passing copy=False failed. __array__ must implement 'dtype' and 'copy' keyword arguments. To learn more, see the migration guide https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword\n return Operator(np.array(instruction, dtype=complex))\n/workspace/qiskit/version.py:20: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.\n import pkg_resources\nTraceback (most recent call last):\n File \"<stdin>\", line 7, in <module>\n File \"/workspace/qiskit/__init__.py\", line 53, in <module>\n from qiskit.execute_function import execute # noqa\n File \"/workspace/qiskit/execute_function.py\", line 24, in <module>\n from qiskit.compiler import transpile, assemble, schedule\n File \"/workspace/qiskit/compiler/__init__.py\", line 34, in <module>\n from .transpiler import transpile\n File \"/workspace/qiskit/compiler/transpiler.py\", line 35, in <module>\n from qiskit.transpiler.passes import ApplyLayout\n File \"/workspace/qiskit/transpiler/passes/__init__.py\", line 126, in <module>\n from .layout import SetLayout\n File \"/workspace/qiskit/transpiler/passes/layout/__init__.py\", line 19, in <module>\n from .sabre_layout import SabreLayout\n File \"/workspace/qiskit/transpiler/passes/layout/sabre_layout.py\", line 24, in <module>\n from qiskit.transpiler.passes.routing import SabreSwap\n File \"/workspace/qiskit/transpiler/passes/routing/__init__.py\", line 18, in <module>\n from .stochastic_swap import StochasticSwap\n File \"/workspace/qiskit/transpiler/passes/routing/stochastic_swap.py\", line 29, in <module>\n from .cython.stochastic_swap.swap_trial import swap_trial\nModuleNotFoundError: No module named 'qiskit.transpiler.passes.routing.cython.stochastic_swap.swap_trial'\n",
"exit_code": 1
}
}Generated tokens 247 tokens · stopped: STOP
It's failing because it's trying to import `nlayout_from_layout` from the mocked module. I can just add that as an attribute to the mocked module.
```python
m = ModuleType('qiskit.transpiler.passes.routing.cython.stochastic_swap.utils')
m.nlayout_from_layout = lambda x: x
sys.modules['qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'] = m
```
Let's try this.
<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY'
import sys
from types import ModuleType
m = ModuleType('qiskit.transpiler.passes.routing.cython.stochastic_swap.utils')
m.nlayout_from_layout = lambda x: x
sys.modules['qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'] = m
from qiskit.circuit.quantumcircuit import QuantumCircuit
print('QuantumCircuit imported successfully')
PY
<|"|>}<tool_call|><|tool_response>
Turn 9at 321 s870 tokens out6,146 prompt tokens
The imports in `qiskit/__init__.py` are taking me down a rabbit hole. I don't need the full `qiskit` package for this task; I only need the `OptimizeSwapBeforeMeasure` pass and some basic `qiskit.circuit` things.
The problem is that `from qiskit.circuit.quantumcircuit import QuantumCircuit` triggers `qiskit/__init__.py`.
If I can avoid importing from the top-level `qiskit` and instead import from the relative paths, maybe it will work. But `qiskit/circuit/quantumcircuit.py` also probably imports from other things.
Actually, if I change the current working directory to something else, and then add the `/workspace` to `sys.path`, it might still trigger the same thing if it does `import qiskit`.
Wait, if I just want to test `OptimizeSwapBeforeMeasure`, I only need:
- `qiskit.transpiler.passes.optimization.optimize_swap_before_measure.OptimizeSwapBeforeMeasure`
- `qiskit.circuit.QuantumCircuit`
- `qiskit.transpiler.PassManager`
Let's see if I can import them without triggering the top-level `qiskit` init.
Wait, the `qiskit` folder in `/workspace` IS the package.
If I do:
```python
import sys
sys.path.append('/workspace')
import qiskit.transpiler.passes.optimization.optimize_swap_before_measure
```
It will still execute `/workspace/qiskit/__init__.py`.
Let's try to disable the imports in `/workspace/qiskit/__init__.py` that are causing problems.
Wait, I can just mock the entire `qiskit.transpiler.passes.routing.cython` package.
```python
import sys
from types import ModuleType
cython_mod = ModuleType('qiskit.transpiler.passes.routing.cython')
sys.modules['qiskit.transpiler.passes.routing.cython'] = cython_mod
# Also need the submodules
stochastic_swap_utils = ModuleType('qiskit.transpiler.passes.routing.cython.stochastic_swap.utils')
stochastic_swap_utils.nlayout_from_layout = lambda x: x
sys.modules['qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'] = stochastic_swap_utils
swap_trial_mod = ModuleType('qiskit.transpiler.passes.routing.cython.stochastic_swap.swap_trial')
swap_trial_mod.swap_trial = lambda x: x
sys.modules['qiskit.transpiler.passes.routing.cython.stochastic_swap.swap_trial'] = swap_trial_mod
```
Let's try this.
TOOL CALL · run_command
{
"command": "python3 - <<'PY'\nimport sys\nfrom types import ModuleType\n\ndef mock_module(name, attrs=None):\n m = ModuleType(name)\n if attrs:\n for attr, val in attrs.items():\n setattr(m, attr, val)\n sys.modules[name] = m\n return m\n\nmock_module('qiskit.transpiler.passes.routing.cython')\nmock_module('qiskit.transpiler.passes.routing.cython.stochastic_swap.utils', {'nlayout_from_layout': lambda x: x})\nmock_module('qiskit.transpiler.passes.routing.cython.stochastic_swap.swap_trial', {'swap_trial': lambda x: x})\n\nfrom qiskit.circuit.quantumcircuit import QuantumCircuit\nprint('QuantumCircuit imported successfully')\nPY\n"
}Result of run_command 1,088 characters
{
"status": "ok",
"stdout": "QuantumCircuit imported successfully\n",
"stderr": "/workspace/qiskit/circuit/equivalence.py:18: DeprecationWarning: The retworkx package is deprecated and has been renamed to rustworkx. Rustworkx is a drop-in replacement and can be used by replacing `import retworkx` with import `rustworkx`. \n import retworkx as rx\n/workspace/qiskit/quantum_info/operators/operator.py:424: DeprecationWarning: __array__ implementation doesn't accept a copy keyword, so passing copy=False failed. __array__ must implement 'dtype' and 'copy' keyword arguments. To learn more, see the migration guide https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword\n return Operator(np.array(instruction, dtype=complex))\n/workspace/qiskit/version.py:20: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.\n import pkg_resources\n",
"exit_code": 0
}Generated tokens 870 tokens · stopped: STOP
The imports in `qiskit/__init__.py` are taking me down a rabbit hole. I don't need the full `qiskit` package for this task; I only need the `OptimizeSwapBeforeMeasure` pass and some basic `qiskit.circuit` things.
The problem is that `from qiskit.circuit.quantumcircuit import QuantumCircuit` triggers `qiskit/__init__.py`.
If I can avoid importing from the top-level `qiskit` and instead import from the relative paths, maybe it will work. But `qiskit/circuit/quantumcircuit.py` also probably imports from other things.
Actually, if I change the current working directory to something else, and then add the `/workspace` to `sys.path`, it might still trigger the same thing if it does `import qiskit`.
Wait, if I just want to test `OptimizeSwapBeforeMeasure`, I only need:
- `qiskit.transpiler.passes.optimization.optimize_swap_before_measure.OptimizeSwapBeforeMeasure`
- `qiskit.circuit.QuantumCircuit`
- `qiskit.transpiler.PassManager`
Let's see if I can import them without triggering the top-level `qiskit` init.
Wait, the `qiskit` folder in `/workspace` IS the package.
If I do:
```python
import sys
sys.path.append('/workspace')
import qiskit.transpiler.passes.optimization.optimize_swap_before_measure
```
It will still execute `/workspace/qiskit/__init__.py`.
Let's try to disable the imports in `/workspace/qiskit/__init__.py` that are causing problems.
Wait, I can just mock the entire `qiskit.transpiler.passes.routing.cython` package.
```python
import sys
from types import ModuleType
cython_mod = ModuleType('qiskit.transpiler.passes.routing.cython')
sys.modules['qiskit.transpiler.passes.routing.cython'] = cython_mod
# Also need the submodules
stochastic_swap_utils = ModuleType('qiskit.transpiler.passes.routing.cython.stochastic_swap.utils')
stochastic_swap_utils.nlayout_from_layout = lambda x: x
sys.modules['qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'] = stochastic_swap_utils
swap_trial_mod = ModuleType('qiskit.transpiler.passes.routing.cython.stochastic_swap.swap_trial')
swap_trial_mod.swap_trial = lambda x: x
sys.modules['qiskit.transpiler.passes.routing.cython.stochastic_swap.swap_trial'] = swap_trial_mod
```
Let's try this.
<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY'
import sys
from types import ModuleType
def mock_module(name, attrs=None):
m = ModuleType(name)
if attrs:
for attr, val in attrs.items():
setattr(m, attr, val)
sys.modules[name] = m
return m
mock_module('qiskit.transpiler.passes.routing.cython')
mock_module('qiskit.transpiler.passes.routing.cython.stochastic_swap.utils', {'nlayout_from_layout': lambda x: x})
mock_module('qiskit.transpiler.passes.routing.cython.stochastic_swap.swap_trial', {'swap_trial': lambda x: x})
from qiskit.circuit.quantumcircuit import QuantumCircuit
print('QuantumCircuit imported successfully')
PY
<|"|>}<tool_call|><|tool_response>
Turn 10at 328 s77 tokens out7,349 prompt tokens
Great! Now I can run the reproduction script. I'll include the mocking logic in it. But first, let's re-read `OptimizeSwapBeforeMeasure` and understand the bug.
TOOL CALL · read_file
{
"filepath": "qiskit/transpiler/passes/optimization/optimize_swap_before_measure.py"
}Result of read_file 3,047 characters
{
"status": "ok",
"filepath": "qiskit/transpiler/passes/optimization/optimize_swap_before_measure.py",
"content": "# This code is part of Qiskit.\n#\n# (C) Copyright IBM 2017, 2019.\n#\n# This code is licensed under the Apache License, Version 2.0. You may\n# obtain a copy of this license in the LICENSE.txt file in the root directory\n# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.\n#\n# Any modifications or derivative works of this code must retain this\n# copyright notice, and modified files need to carry a notice indicating\n# that they have been altered from the originals.\n\n\n\"\"\"Remove the swaps followed by measurement (and adapt the measurement).\"\"\"\n\nfrom qiskit.circuit import Measure\nfrom qiskit.circuit.library.standard_gates import SwapGate\nfrom qiskit.transpiler.basepasses import TransformationPass\nfrom qiskit.dagcircuit import DAGCircuit\n\n\nclass OptimizeSwapBeforeMeasure(TransformationPass):\n \"\"\"Remove the swaps followed by measurement (and adapt the measurement).\n\n Transpiler pass to remove swaps in front of measurements by re-targeting\n the classical bit of the measure instruction.\n \"\"\"\n\n def run(self, dag):\n \"\"\"Run the OptimizeSwapBeforeMeasure pass on `dag`.\n\n Args:\n dag (DAGCircuit): the DAG to be optimized.\n\n Returns:\n DAGCircuit: the optimized DAG.\n \"\"\"\n swaps = dag.op_nodes(SwapGate)\n for swap in swaps:\n final_successor = []\n for successor in dag.successors(swap):\n final_successor.append(successor.type == 'out' or (successor.type == 'op' and\n successor.op.name == 'measure'))\n if all(final_successor):\n # the node swap needs to be removed and, if a measure follows, needs to be adapted\n swap_qargs = swap.qargs\n measure_layer = DAGCircuit()\n for qreg in dag.qregs.values():\n measure_layer.add_qreg(qreg)\n for creg in dag.cregs.values():\n measure_layer.add_creg(creg)\n for successor in list(dag.successors(swap)):\n if successor.type == 'op' and successor.op.name == 'measure':\n # replace measure node with a new one, where qargs is set with the \"other\"\n # swap qarg.\n dag.remove_op_node(successor)\n old_measure_qarg = successor.qargs[0]\n new_measure_qarg = swap_qargs[swap_qargs.index(old_measure_qarg) - 1]\n measure_layer.apply_operation_back(Measure(), [new_measure_qarg],\n [successor.cargs[0]])\n dag.compose(measure_layer)\n dag.remove_op_node(swap)\n return dag",
"start_line": 1,
"end_line": 63,
"total_lines": 63,
"is_truncated": false
}Generated tokens 77 tokens · stopped: STOP
Great! Now I can run the reproduction script. I'll include the mocking logic in it.
But first, let's re-read `OptimizeSwapBeforeMeasure` and understand the bug.<channel|><|tool_call>call:read_file{filepath:<|"|>qiskit/transpiler/passes/optimization/optimize_swap_before_measure.py<|"|>}<tool_call|><|tool_response>
Turn 11at 431 s1,557 tokens out8,238 prompt tokens
The current implementation:
1. Iterates over all `SwapGate` nodes in the DAG.
2. For each swap, it checks if all successors are either 'out' nodes or 'measure' nodes.
3. If so, it removes the swap and adapts the following measurements.
The problem is that if you have multiple SWAPs in a row (e.g., a permutation), the first SWAP (closest to the measurement) will be identified and removed. But the SWAP before it only becomes a candidate for removal after the first one is gone. Since the pass only iterates through the initial list of `swaps = dag.op_nodes(SwapGate)`, it won't catch the second SWAP until the pass is run again.
Wait, the loop is:
```python
swaps = dag.op_nodes(SwapGate)
for swap in swaps:
# ...
if all(final_successor):
# ...
dag.remove_op_node(swap)
```
`dag.op_nodes(SwapGate)` returns a list. If we remove a node, the list `swaps` is not updated.
If we have `SWAP(0,1) -> SWAP(0,1) -> measure(0)`, the second `SWAP(0,1)` will be removed. Then the first `SWAP(0,1)` becomes a candidate, but it's already in the `swaps` list.
Wait, if `SWAP1 -> SWAP2 -> measure(0)`, then `SWAP2` is the one and only successor to `measure(0)`.
When the loop hits `SWAP2`, it will be removed.
When the loop hits `SWAP1`, it now has `measure(0)` as its successor (because `SWAP2` is gone). So it should also be removed.
Wait, let's trace this carefully.
`swaps = dag.op_nodes(SwapGate)`
Assume `swaps = [SWAP1, SWAP2]` in the order they appear in the DAG.
If `SWAP1` is before `SWAP2`:
1. Loop `swap = SWAP1`: `SWAP1` successor is `SWAP2`. `SWAP2` is not 'out' or 'measure'. `all(final_successor)` is False.
2. Loop `swap = SWAP2`: `SWAP2` successor is `measure(0)`. `all(final_successor)` is True. `SWAP2` is removed.
Now the pass ends. `SWAP1` was not removed.
So the fix should be to repeat the process until no more SWAPs can be removed.
Or, iterate in reverse order of appearance in the DAG.
Actually, a simple `while` loop that continues as long as something was removed would work.
But wait, `dag.op_nodes(SwapGate)` may not be in order.
If I want to remove all SWAPs that can be commuted to the end, I should probably keep doing it until a fixed point is reached.
Wait, the problem description says: "If multiple layers of SWAPs (a permutation) exist before the measurements, the pass must be invoked multiple times to remove all of them."
This confirms my analysis.
Let's write a reproduction script to verify this.
TOOL CALL · run_command
{
"command": "python3 - <<'PY'\nimport sys\nfrom types import ModuleType\n\ndef mock_module(name, attrs=None):\n m = ModuleType(name)\n if attrs:\n for attr, val in attrs.items():\n setattr(m, attr, val)\n sys.modules[name] = m\n return m\n\nmock_module('qiskit.transpiler.passes.routing.cython')\nmock_module('qiskit.transpiler.passes.routing.cython.stochastic_swap.utils', {'nlayout_from_layout': lambda x: x})\nmock_module('qiskit.transpiler.passes.routing.cython.stochastic_swap.swap_trial', {'swap_trial': lambda x: x})\n\nfrom qiskit.circuit.quantumcircuit import QuantumCircuit\nfrom qiskit.transpiler.passes.optimization.optimize_swap_before_measure import OptimizeSwapBeforeMeasure\nfrom qiskit.transpiler.dagcircuit import DAGCircuit\nfrom qiskit.circuit.library.standard_gates import SwapGate\nfrom qiskit.circuit import Measure\n\ndef test_multiple_swaps():\n # Create a circuit with two swaps before a measurement\n # SWAP(0,1) -> SWAP(0,1) -> Measure(0)\n qc = QuantumCircuit(2, 2)\n qc.swap(0, 1)\n qc.swap(0, 1)\n qc.measure(0, 0)\n qc.measure(1, 1)\n\n dag = DAGCircuit()\n dag.apply_operation_back(qc.data[0].operation, qc.data[0].qargs, qc.data[0].cargs)\n dag.apply_operation_back(qc.data[1].operation, qc.data[1].qargs, qc.data[1].cargs)\n dag.apply_operation_back(qc.data[2].operation, qc.data[2].qargs, qc.data[2].cargs)\n dag.apply_operation_back(qc.data[3].operation, qc.data[3].qargs, qc.data[3].cargs)\n # Need to add qregs and cregs to dag\n for qr in qc.qregs:\n dag.add_qreg(qr)\n for cr in qc.cregs:\n dag.add_creg(cr)\n # Re-apply operations because qregs/cregs must be present\n dag = DAGCircuit()\n for qr in qc.qregs:\n dag.add_qreg(qr)\n for cr in qc.cregs:\n dag.add_creg(cr)\n for inst in qc.data:\n dag.apply_operation_back(inst.operation, inst.qargs, inst.cargs)\n\n pass_opt = OptimizeSwapBeforeMeasure()\n dag_before = dag.copy()\n dag_after = pass_opt.run(dag)\n\n swaps_before = len(dag_before.op_nodes(SwapGate))\n swaps_after = len(dag_after.op_nodes(SwapGate))\n\n print(f\"Swaps before: {swaps_before}\")\n print(f\"Swaps after: {swaps_after}\")\n\n if swaps_after == 0:\n print(\"SUCCESS: All swaps removed\")\n else:\n print(\"FAILURE: Some swaps remain\")\n\ntest_multiple_swaps()\nPY\n"
}Result of run_command 2,401 characters
{
"status": "error",
"error_type": "CommandError",
"error_message": "/workspace/qiskit/circuit/equivalence.py:18: DeprecationWarning: The retworkx package is deprecated and has been renamed to rustworkx. Rustworkx is a drop-in replacement and can be used by replacing `import retworkx` with import `rustworkx`. \n import retworkx as rx\n/workspace/qiskit/quantum_info/operators/operator.py:424: DeprecationWarning: __array__ implementation doesn't accept a copy keyword, so passing copy=False failed. __array__ must implement 'dtype' and 'copy' keyword arguments. To learn more, see the migration guide https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword\n return Operator(np.array(instruction, dtype=complex))\n/workspace/qiskit/version.py:20: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.\n import pkg_resources\nTraceback (most recent call last):\n File \"<stdin>\", line 18, in <module>\nModuleNotFoundError: No module named 'qiskit.transpiler.dagcircuit'\n",
"details": {
"stdout": "",
"stderr": "/workspace/qiskit/circuit/equivalence.py:18: DeprecationWarning: The retworkx package is deprecated and has been renamed to rustworkx. Rustworkx is a drop-in replacement and can be used by replacing `import retworkx` with import `rustworkx`. \n import retworkx as rx\n/workspace/qiskit/quantum_info/operators/operator.py:424: DeprecationWarning: __array__ implementation doesn't accept a copy keyword, so passing copy=False failed. __array__ must implement 'dtype' and 'copy' keyword arguments. To learn more, see the migration guide https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword\n return Operator(np.array(instruction, dtype=complex))\n/workspace/qiskit/version.py:20: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.\n import pkg_resources\nTraceback (most recent call last):\n File \"<stdin>\", line 18, in <module>\nModuleNotFoundError: No module named 'qiskit.transpiler.dagcircuit'\n",
"exit_code": 1
}
}Generated tokens 1,557 tokens · stopped: STOP
The current implementation:
1. Iterates over all `SwapGate` nodes in the DAG.
2. For each swap, it checks if all successors are either 'out' nodes or 'measure' nodes.
3. If so, it removes the swap and adapts the following measurements.
The problem is that if you have multiple SWAPs in a row (e.g., a permutation), the first SWAP (closest to the measurement) will be identified and removed. But the SWAP before it only becomes a candidate for removal after the first one is gone. Since the pass only iterates through the initial list of `swaps = dag.op_nodes(SwapGate)`, it won't catch the second SWAP until the pass is run again.
Wait, the loop is:
```python
swaps = dag.op_nodes(SwapGate)
for swap in swaps:
# ...
if all(final_successor):
# ...
dag.remove_op_node(swap)
```
`dag.op_nodes(SwapGate)` returns a list. If we remove a node, the list `swaps` is not updated.
If we have `SWAP(0,1) -> SWAP(0,1) -> measure(0)`, the second `SWAP(0,1)` will be removed. Then the first `SWAP(0,1)` becomes a candidate, but it's already in the `swaps` list.
Wait, if `SWAP1 -> SWAP2 -> measure(0)`, then `SWAP2` is the one and only successor to `measure(0)`.
When the loop hits `SWAP2`, it will be removed.
When the loop hits `SWAP1`, it now has `measure(0)` as its successor (because `SWAP2` is gone). So it should also be removed.
Wait, let's trace this carefully.
`swaps = dag.op_nodes(SwapGate)`
Assume `swaps = [SWAP1, SWAP2]` in the order they appear in the DAG.
If `SWAP1` is before `SWAP2`:
1. Loop `swap = SWAP1`: `SWAP1` successor is `SWAP2`. `SWAP2` is not 'out' or 'measure'. `all(final_successor)` is False.
2. Loop `swap = SWAP2`: `SWAP2` successor is `measure(0)`. `all(final_successor)` is True. `SWAP2` is removed.
Now the pass ends. `SWAP1` was not removed.
So the fix should be to repeat the process until no more SWAPs can be removed.
Or, iterate in reverse order of appearance in the DAG.
Actually, a simple `while` loop that continues as long as something was removed would work.
But wait, `dag.op_nodes(SwapGate)` may not be in order.
If I want to remove all SWAPs that can be commuted to the end, I should probably keep doing it until a fixed point is reached.
Wait, the problem description says: "If multiple layers of SWAPs (a permutation) exist before the measurements, the pass must be invoked multiple times to remove all of them."
This confirms my analysis.
Let's write a reproduction script to verify this.
<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY'
import sys
from types import ModuleType
def mock_module(name, attrs=None):
m = ModuleType(name)
if attrs:
for attr, val in attrs.items():
setattr(m, attr, val)
sys.modules[name] = m
return m
mock_module('qiskit.transpiler.passes.routing.cython')
mock_module('qiskit.transpiler.passes.routing.cython.stochastic_swap.utils', {'nlayout_from_layout': lambda x: x})
mock_module('qiskit.transpiler.passes.routing.cython.stochastic_swap.swap_trial', {'swap_trial': lambda x: x})
from qiskit.circuit.quantumcircuit import QuantumCircuit
from qiskit.transpiler.passes.optimization.optimize_swap_before_measure import OptimizeSwapBeforeMeasure
from qiskit.transpiler.dagcircuit import DAGCircuit
from qiskit.circuit.library.standard_gates import SwapGate
from qiskit.circuit import Measure
def test_multiple_swaps():
# Create a circuit with two swaps before a measurement
# SWAP(0,1) -> SWAP(0,1) -> Measure(0)
qc = QuantumCircuit(2, 2)
qc.swap(0, 1)
qc.swap(0, 1)
qc.measure(0, 0)
qc.measure(1, 1)
dag = DAGCircuit()
dag.apply_operation_back(qc.data[0].operation, qc.data[0].qargs, qc.data[0].cargs)
dag.apply_operation_back(qc.data[1].operation, qc.data[1].qargs, qc.data[1].cargs)
dag.apply_operation_back(qc.data[2].operation, qc.data[2].qargs, qc.data[2].cargs)
dag.apply_operation_back(qc.data[3].operation, qc.data[3].qargs, qc.data[3].cargs)
# Need to add qregs and cregs to dag
for qr in qc.qregs:
dag.add_qreg(qr)
for cr in qc.cregs:
dag.add_creg(cr)
# Re-apply operations because qregs/cregs must be present
dag = DAGCircuit()
for qr in qc.qregs:
dag.add_qreg(qr)
for cr in qc.cregs:
dag.add_creg(cr)
for inst in qc.data:
dag.apply_operation_back(inst.operation, inst.qargs, inst.cargs)
pass_opt = OptimizeSwapBeforeMeasure()
dag_before = dag.copy()
dag_after = pass_opt.run(dag)
swaps_before = len(dag_before.op_nodes(SwapGate))
swaps_after = len(dag_after.op_nodes(SwapGate))
print(f"Swaps before: {swaps_before}")
print(f"Swaps after: {swaps_after}")
if swaps_after == 0:
print("SUCCESS: All swaps removed")
else:
print("FAILURE: Some swaps remain")
test_multiple_swaps()
PY
<|"|>}<tool_call|><|tool_response>
Patch, tests and logs
Final code change Included
Test output Missing
Not saved for this rollout. Nothing has been inferred or reconstructed.
Test errors Missing
Not saved for this rollout. Nothing has been inferred or reconstructed.
Test report (JUnit) Missing
Not saved for this rollout. Nothing has been inferred or reconstructed.
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 Qiskit/qiskit-terra.
[ 14.1s] 💭 (622 chars) "The user is reporting an issue with `OptimizeSwapBeforeMeasure` pass in Qiskit's transpiler.
The pass is supposed to com..."
[ 14.1s] 🔧 run_command grep -rn --include="*.py" "class OptimizeSwapBeforeMeasure" .
[ 14.2s] → ./qiskit/transpiler/passes/optimization/optimize_swap_before_measure.py:22:class
OptimizeSwapBeforeMeasure(Transformatio
[ 39.3s] 💭 (187 chars) "Okay, the file is `qiskit/transpiler/passes/optimization/optimize_swap_before_measure.py`.
Now I will create a reproduc..."
[ 39.3s] 🔧 run_command (54 lines) cat <<'PY' > /tmp/repro.py
[ 42.0s] → error (exit 0):
[ 52.5s] 💭 (278 chars) "Wait, I got a `ModuleNotFoundError: No module named
'qiskit.transpiler.passes.routing.cython.stochastic_swap.utils'`.
Th..."
[ 52.5s] 🔧 run_command find . -name "stochastic_swap.utils*"
[ 52.6s] 🔧
[ 106.2s] 💭 (1460 chars) "It seems the cython extensions are not built. That's a problem for running the full
`qiskit` imports if they depend on t..."
[ 106.2s] 🔧 run_command (53 lines) cat <<'PY' > /tmp/repro.py
[ 107.8s] → error (exit 0):
[ 155.3s] 💭 (1966 chars) "Wait, it seems that even `from qiskit.circuit.quantumcircuit import QuantumCircuit` is
triggering `from qiskit/__init__...."
[ 155.3s] 🔧 run_command python3 -c "from qiskit.circuit.quantumcircuit import QuantumCircuit; print('ok'
[ 157.1s] → error (exit 0):
[ 174.3s] 💭 (636 chars) "Wait, the `qiskit/__init__.py` is definitely being executed because it's in the traceback:
`File "/workspace/qiskit/__in..."
[ 174.3s] 🔧 run_command (8 lines) cat <<'PY' > /tmp/fix_imports.py
[ 174.4s] 🔧
[ 180.6s] 💭 (58 chars) "Now let's try to run a script that imports the mock first."
[ 180.6s] 🔧 run_command (9 lines) python3 - <<'PY'
[ 182.2s] → error (exit 0):
[ 196.5s] 💭 (375 chars) "It's failing because it's trying to import `nlayout_from_layout` from the mocked module. I
can just add that as an attri..."
[ 196.5s] 🔧 run_command (10 lines) python3 - <<'PY'
[ 198.1s] → error (exit 0):
[ 319.5s] 💭 (2186 chars) "The imports in `qiskit/__init__.py` are taking me down a rabbit hole. I don't need the full
`qiskit` package for this ta..."
[ 319.5s] 🔧 run_command (19 lines) python3 - <<'PY'
[ 321.1s] → QuantumCircuit imported successfully
[ 326.6s] 💭 (161 chars) "Great! Now I can run the reproduction script. I'll include the mocking logic in it.
But first, let's re-read `OptimizeS..."
[ 326.6s] 📖 read_file (qiskit/transpiler/passes/optimization/optimize_swap_before_measure.py)
[ 326.6s] ✓ {'status': 'ok', 'filepath': 'qiskit/transpiler/passes/optimization/optimize_swap_before_measure.py',
'content': '# This…
[ 429.1s] 💭 (2512 chars) "The current implementation:
1. Iterates over all `SwapGate` nodes in the DAG.
2. For each swap, it checks if all success..."
[ 429.1s] 🔧 run_command (67 lines) python3 - <<'PY'
[ 430.6s] → error (exit 0):
Native result row
{
"agent_error": "Agent exceeded session timeout (7.5 min)",
"duration_seconds": 454.08,
"error": "Empty agent patch",
"grade": {
"error": "Empty agent patch",
"resolved": false,
"strict_clean_patch": false,
"test_exit_code": -1
},
"instance_id": "qiskit__qiskit-terra-5833",
"pass_idx": 0,
"patch_chars": 0,
"phase1_seconds": 454.08,
"repo": "Qiskit/qiskit-terra",
"request_log_path": "/kaggle-root/working/r31/rollouts_X/requests/qiskit__qiskit-terra-5833__p0__r5.jsonl",
"resolved": false,
"rollout_idx": 5,
"run_key": "qiskit__qiskit-terra-5833__p0__r5",
"strict_clean_patch": false,
"tool_calls": 11,
"total_llm_calls": 11,
"trace_path": "/kaggle-root/working/r31/rollouts_X/traces/trace_qiskit__qiskit-terra-5833__p0__r5.json"
}