Update lp testing#1110
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/ok to test f2791df |
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📝 WalkthroughWalkthroughExtracts solver-parameter handling into a new Cython/C++-backed ChangesSolver settings migration
Estimated code review effort🎯 4 (Complex) | ⏱️ ~60 minutes Suggested labels
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Actionable comments posted: 4
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⚠️ Outside diff range comments (1)
python/cuopt/cuopt/tests/linear_programming/test_lp_solver.py (1)
718-745:⚠️ Potential issue | 🟠 MajorWrite the generated
.mpsand.solfiles undertmp_path.This test writes
afiro_out.mpsandafiro.solinto the process working directory, so parallel runs can collide and stale artifacts can mask failures. Please build both paths undertmp_pathand pass those full paths intoCUOPT_USER_PROBLEM_FILE/CUOPT_SOLUTION_FILE.As per coding guidelines, "Ensure test isolation: prevent GPU state, cached memory, and global variables from leaking between test cases; verify each test independently initializes its environment"
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@python/cuopt/cuopt/tests/linear_programming/test_lp_solver.py` around lines 718 - 745, The test currently writes afiro_out.mps and afiro.sol to the CWD causing collisions; update the test to build full paths under the pytest-provided tmp_path and use those paths when setting CUOPT_USER_PROBLEM_FILE and CUOPT_SOLUTION_FILE in SolverSettings (referencing SolverSettings.set_parameter, CUOPT_USER_PROBLEM_FILE, CUOPT_SOLUTION_FILE, and solver.Solve), pass the tmp_path-based mps path into cuopt_mps_parser.ParseMps, use those same tmp_path paths for the file existence asserts and os.remove calls, and ensure any settings are reset (e.g., set CUOPT_USER_PROBLEM_FILE back to "" if previously done) so the solver state remains isolated between tests.
🧹 Nitpick comments (1)
python/cuopt/cuopt/linear_programming/solver_settings/__init__.py (1)
6-22: Avoid exporting the livesolver_paramslist.
solver_settings.pyxuses this module-global list for parameter validation, so re-exporting the same mutable object here lets callers accidentally corrupt validation state for the whole process. Export an immutable copy/tuple from the package layer instead.Proposed hardening
from .solver_settings import ( PDLPSolverMode, SolverMethod, SolverSettings, get_solver_parameter_names, get_solver_setting, - solver_params, + solver_params as _solver_params, ) + +solver_params = tuple(_solver_params) __all__ = [ "PDLPSolverMode", "SolverMethod", "SolverSettings",🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@python/cuopt/cuopt/linear_programming/solver_settings/__init__.py` around lines 6 - 22, The module currently re-exports the live mutable list solver_params which allows external code to mutate package-global validation state; change the export to expose an immutable copy (e.g., tuple(solver_params)) instead of the original list and keep internal code using the original list unchanged. Locate the names in this file (solver_params in the from .solver_settings import (...) list and the "__all__" list) and replace the exported symbol with an immutable copy while leaving the internal solver_settings.pyx and the original solver_params in that module untouched so validation continues to use the mutable list internally but callers only receive an immutable tuple.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@python/cuopt/cuopt/linear_programming/solver_settings/solver_settings.pyx`:
- Around line 365-436: The warm-start buffers retrieved via
get_pdlp_warm_start_data() are passed raw to get_data_ptr() and then cast to
const double* (in the call to c_solver_settings.set_pdlp_warm_start_data), which
can misinterpret float32/integer or non-contiguous arrays; normalize each array
to contiguous float64 before extracting pointers (e.g., use
np.ascontiguousarray(arr, dtype=np.float64)) for current_primal_solution,
current_dual_solution, initial_primal_average, initial_dual_average,
current_ATY, sum_primal_solutions, sum_dual_solutions,
last_restart_duality_gap_primal_solution, and
last_restart_duality_gap_dual_solution, or alternatively add dtype/contiguity
checks in PDLPWarmStartData.__init__ to raise on incompatible inputs so
get_data_ptr() always receives a contiguous float64 buffer.
In `@python/cuopt/cuopt/linear_programming/solver/solver_parameters.py`:
- Around line 4-16: Add a one-time deprecation warning at module import in the
compatibility shim (solver_parameters.py): import the warnings module and call
warnings.warn("cuopt.linear_programming.solver_parameters is deprecated; use
cuopt.linear_programming.solver_settings instead", DeprecationWarning,
stacklevel=2) near the top of the file (before exporting CUOPT_ constants) so
callers using the old import path get a clear migration signal; place the
warning call alongside the existing imports and the for _name in
dir(_solver_settings_ext) loop to ensure it runs on import.
In `@python/cuopt/cuopt/tests/linear_programming/test_lp_solver.py`:
- Around line 354-375: The test currently loads parameters into reloaded but
continues to call solver.Solve(data_model_obj, settings) instead of exercising
reloaded; change the solve call to solver.Solve(data_model_obj, reloaded) and
ensure you invoke reloaded.set_c_solver_settings() before the solve (mirroring
settings.set_c_solver_settings()); after solving, assert not only
solution.get_termination_reason() == "Optimal" but also numerical correctness by
checking solution.get_objective_value() against the expected objective and
solution.get_primal_values() (or the appropriate accessor) against expected
variable values for this small LP to validate results.
In `@python/cuopt/cuopt/tests/linear_programming/test_python_API.py`:
- Line 740: Add a trailing newline at the end of the file so the final line
"assert problem.ObjValue == pytest.approx(3.715847, abs=1e-3)" is followed by a
newline character; this fixes the W292 warning flagged by Ruff and keeps
python/cuopt/cuopt/tests/linear_programming/test_python_API.py clean in CI.
---
Outside diff comments:
In `@python/cuopt/cuopt/tests/linear_programming/test_lp_solver.py`:
- Around line 718-745: The test currently writes afiro_out.mps and afiro.sol to
the CWD causing collisions; update the test to build full paths under the
pytest-provided tmp_path and use those paths when setting
CUOPT_USER_PROBLEM_FILE and CUOPT_SOLUTION_FILE in SolverSettings (referencing
SolverSettings.set_parameter, CUOPT_USER_PROBLEM_FILE, CUOPT_SOLUTION_FILE, and
solver.Solve), pass the tmp_path-based mps path into cuopt_mps_parser.ParseMps,
use those same tmp_path paths for the file existence asserts and os.remove
calls, and ensure any settings are reset (e.g., set CUOPT_USER_PROBLEM_FILE back
to "" if previously done) so the solver state remains isolated between tests.
---
Nitpick comments:
In `@python/cuopt/cuopt/linear_programming/solver_settings/__init__.py`:
- Around line 6-22: The module currently re-exports the live mutable list
solver_params which allows external code to mutate package-global validation
state; change the export to expose an immutable copy (e.g.,
tuple(solver_params)) instead of the original list and keep internal code using
the original list unchanged. Locate the names in this file (solver_params in the
from .solver_settings import (...) list and the "__all__" list) and replace the
exported symbol with an immutable copy while leaving the internal
solver_settings.pyx and the original solver_params in that module untouched so
validation continues to use the mutable list internally but callers only receive
an immutable tuple.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (12)
python/cuopt/cuopt/CMakeLists.txtpython/cuopt/cuopt/linear_programming/solver/CMakeLists.txtpython/cuopt/cuopt/linear_programming/solver/solver.pxdpython/cuopt/cuopt/linear_programming/solver/solver_parameters.pypython/cuopt/cuopt/linear_programming/solver/solver_parameters.pyxpython/cuopt/cuopt/linear_programming/solver/solver_wrapper.pyxpython/cuopt/cuopt/linear_programming/solver_settings/CMakeLists.txtpython/cuopt/cuopt/linear_programming/solver_settings/__init__.pypython/cuopt/cuopt/linear_programming/solver_settings/solver_settings.pxdpython/cuopt/cuopt/linear_programming/solver_settings/solver_settings.pyxpython/cuopt/cuopt/tests/linear_programming/test_lp_solver.pypython/cuopt/cuopt/tests/linear_programming/test_python_API.py
💤 Files with no reviewable changes (1)
- python/cuopt/cuopt/linear_programming/solver/solver_parameters.pyx
| """Backward-compatible module; LP parameter helpers live in solver_settings.""" | ||
|
|
||
| from cuopt.linear_programming.solver_settings.solver_settings import ( | ||
| get_solver_parameter_names, | ||
| get_solver_setting, | ||
| solver_params, | ||
| ) | ||
|
|
||
| import cuopt.linear_programming.solver_settings.solver_settings as _solver_settings_ext | ||
|
|
||
| for _name in dir(_solver_settings_ext): | ||
| if _name.startswith("CUOPT_"): | ||
| globals()[_name] = getattr(_solver_settings_ext, _name) |
There was a problem hiding this comment.
Emit a deprecation warning from the compatibility shim.
This keeps the old import path working, but callers get no signal to migrate to cuopt.linear_programming.solver_settings. Please warn once at import with an explicit deprecation message and stacklevel=2.
Suggested change
+import warnings
+
"""Backward-compatible module; LP parameter helpers live in solver_settings."""
+
+warnings.warn(
+ "cuopt.linear_programming.solver.solver_parameters is deprecated; "
+ "use cuopt.linear_programming.solver_settings instead.",
+ DeprecationWarning,
+ stacklevel=2,
+)
from cuopt.linear_programming.solver_settings.solver_settings import (
get_solver_parameter_names,
get_solver_setting,
solver_params,As per coding guidelines, **/*.{h,hpp,py}: maintain backward compatibility in Python and server APIs with deprecation warnings
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@python/cuopt/cuopt/linear_programming/solver/solver_parameters.py` around
lines 4 - 16, Add a one-time deprecation warning at module import in the
compatibility shim (solver_parameters.py): import the warnings module and call
warnings.warn("cuopt.linear_programming.solver_parameters is deprecated; use
cuopt.linear_programming.solver_settings instead", DeprecationWarning,
stacklevel=2) near the top of the file (before exporting CUOPT_ constants) so
callers using the old import path get a clear migration signal; place the
warning call alongside the existing imports and the for _name in
dir(_solver_settings_ext) loop to ensure it runs on import.
rgsl888prabhu
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rgsl888prabhu
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PR looks good, have few suggestions.
rgsl888prabhu
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rgsl888prabhu
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Code-level review — focusing on the Python/Cython layer. CI and PR metadata items are out of scope per request.
Net take: the refactor is clean and the new dump/load-parameters API is a good addition. Inline comments below are mostly readability and small structural improvements; none of them block on correctness.
| """ | ||
| return self.pdlp_warm_start_data | ||
|
|
||
| def set_c_solver_settings(self): |
There was a problem hiding this comment.
Document the reset-replay invariant.
set_solver_setting in solver_wrapper.pyx calls settings.c_solver_settings.reset(new solver_settings_t[int, double]()) immediately before calling this method, so every Solve() throws away the C++ settings object and repopulates it from self.settings_dict + self.pdlp_warm_start_data.
That means:
settings_dict/pdlp_warm_start_data/mip_callbackson the Python side are the source of truth.- Any direct mutation of
self.c_solver_settings(e.g. through a future C++-only API) will be discarded on the next Solve. load_parameters_from_filepreserves the invariant by mirroring every loaded value back intosettings_dict.
Worth a short docstring on this method making the contract explicit — otherwise a future reader can reasonably assume c_solver_settings is long-lived state.
|
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| if self.get_pdlp_warm_start_data() is not None: | ||
| from cuopt.linear_programming.solver.solver_wrapper import ( | ||
| get_data_ptr, |
There was a problem hiding this comment.
Lazy import inside the hot path is a code smell.
This from cuopt.linear_programming.solver.solver_wrapper import get_data_ptr is here only to break an import cycle (solver_wrapper.pyx imports SolverSettings from this module).
Suggest moving get_data_ptr to cuopt.utilities — where series_from_buf and InputValidationError already live — and importing it normally at the top of both files. That eliminates the cycle and the per-Solve import/attribute lookup.
Iroy30
added
non-breaking
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/ok to test 53bbc68 |
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Actionable comments posted: 1
Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (1)
python/cuopt/cuopt/tests/linear_programming/test_lp_solver.py (1)
719-728:⚠️ Potential issue | 🟠 MajorUse
tmp_pathfor generated solver artifacts.
afiro_out.mpsandafiro.solare still written to fixed names in the working directory. That makes this test race-prone under parallel pytest runs and leaves state behind whenever cleanup is skipped by an earlier failure. Please route both settings throughtmp_pathand read the files back from there.🧪 Suggested test hardening
-def test_write_files(): +def test_write_files(tmp_path): @@ - settings.set_parameter(CUOPT_USER_PROBLEM_FILE, "afiro_out.mps") - settings.set_parameter(CUOPT_SOLUTION_FILE, "afiro.sol") + problem_path = tmp_path / "afiro_out.mps" + solution_path = tmp_path / "afiro.sol" + settings.set_parameter(CUOPT_USER_PROBLEM_FILE, str(problem_path)) + settings.set_parameter(CUOPT_SOLUTION_FILE, str(solution_path)) @@ - assert os.path.isfile("afiro_out.mps") + assert problem_path.is_file() @@ - afiro = cuopt_mps_parser.ParseMps("afiro_out.mps") - os.remove("afiro_out.mps") + afiro = cuopt_mps_parser.ParseMps(str(problem_path)) @@ - settings.set_parameter(CUOPT_SOLUTION_FILE, "afiro.sol") + settings.set_parameter(CUOPT_SOLUTION_FILE, str(solution_path)) @@ - assert os.path.isfile("afiro.sol") + assert solution_path.is_file() @@ - with open("afiro.sol") as f: + with open(solution_path, encoding="utf-8") as f: for line in f: if "X01" in line: assert float(line.split()[-1]) == pytest.approx(80) - - os.remove("afiro.sol")As per coding guidelines, "Flag flaky tests due to GPU timing, uninitialized memory, or race conditions".
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@python/cuopt/cuopt/tests/linear_programming/test_lp_solver.py` around lines 719 - 728, The test_write_files test writes solver output to fixed filenames; change it to create a temporary directory via the pytest-provided tmp_path and set CUOPT_USER_PROBLEM_FILE and CUOPT_SOLUTION_FILE to paths inside that tmp_path using settings.set_parameter on the SolverSettings instance (the same settings used in test_write_files), then after running the solver read/verify the generated files from tmp_path (e.g., tmp_path / "afiro_out.mps" and tmp_path / "afiro.sol") so artifacts are isolated and the test is race-safe.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@python/cuopt/cuopt/linear_programming/solver_settings/solver_settings.pyx`:
- Around line 377-448: The warm-start arrays from get_pdlp_warm_start_data() are
only partially size-checked: ensure every buffer
(warm_start_data.current_primal_solution, current_dual_solution,
initial_primal_average, initial_dual_average, current_ATY, sum_primal_solutions,
sum_dual_solutions, last_restart_duality_gap_primal_solution,
last_restart_duality_gap_dual_solution) is validated against the derived
primal_size and dual_size (use the shapes used for last_restart_duality_gap_* to
compute primal_size/dual_size) before calling get_data_ptr() and
c_solver_settings.set_pdlp_warm_start_data; if any shape mismatches,
raise/handle an error so set_pdlp_warm_start_data cannot receive inconsistent
pointers. Use the existing symbols get_pdlp_warm_start_data,
warm_start_data.<field>, get_data_ptr, and
c_solver_settings.set_pdlp_warm_start_data to locate and implement the checks.
---
Outside diff comments:
In `@python/cuopt/cuopt/tests/linear_programming/test_lp_solver.py`:
- Around line 719-728: The test_write_files test writes solver output to fixed
filenames; change it to create a temporary directory via the pytest-provided
tmp_path and set CUOPT_USER_PROBLEM_FILE and CUOPT_SOLUTION_FILE to paths inside
that tmp_path using settings.set_parameter on the SolverSettings instance (the
same settings used in test_write_files), then after running the solver
read/verify the generated files from tmp_path (e.g., tmp_path / "afiro_out.mps"
and tmp_path / "afiro.sol") so artifacts are isolated and the test is race-safe.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (5)
python/cuopt/cuopt/linear_programming/solver/solver_parameters.pypython/cuopt/cuopt/linear_programming/solver_settings/__init__.pypython/cuopt/cuopt/linear_programming/solver_settings/solver_settings.pyxpython/cuopt/cuopt/tests/linear_programming/test_lp_solver.pypython/cuopt/cuopt/tests/linear_programming/test_python_API.py
💤 Files with no reviewable changes (1)
- python/cuopt/cuopt/tests/linear_programming/test_python_API.py
🚧 Files skipped from review as they are similar to previous changes (2)
- python/cuopt/cuopt/linear_programming/solver/solver_parameters.py
- python/cuopt/cuopt/linear_programming/solver_settings/init.py
| if self.get_pdlp_warm_start_data() is not None: | ||
| from cuopt.linear_programming.solver.solver_wrapper import ( | ||
| get_data_ptr, | ||
| ) | ||
|
|
||
| warm_start_data = self.get_pdlp_warm_start_data() | ||
| c_current_primal_solution = ( | ||
| get_data_ptr( | ||
| warm_start_data.current_primal_solution # noqa | ||
| ) | ||
| ) | ||
| c_current_dual_solution = ( | ||
| get_data_ptr( | ||
| warm_start_data.current_dual_solution | ||
| ) | ||
| ) | ||
| c_initial_primal_average = ( | ||
| get_data_ptr( | ||
| warm_start_data.initial_primal_average # noqa | ||
| ) | ||
| ) | ||
| c_initial_dual_average = ( | ||
| get_data_ptr( | ||
| warm_start_data.initial_dual_average | ||
| ) | ||
| ) | ||
| c_current_ATY = ( | ||
| get_data_ptr( | ||
| warm_start_data.current_ATY | ||
| ) | ||
| ) | ||
| c_sum_primal_solutions = ( | ||
| get_data_ptr( | ||
| warm_start_data.sum_primal_solutions | ||
| ) | ||
| ) | ||
| c_sum_dual_solutions = ( | ||
| get_data_ptr( | ||
| warm_start_data.sum_dual_solutions | ||
| ) | ||
| ) | ||
| c_last_restart_duality_gap_primal_solution = ( | ||
| get_data_ptr( | ||
| warm_start_data.last_restart_duality_gap_primal_solution # noqa | ||
| ) | ||
| ) | ||
| c_last_restart_duality_gap_dual_solution = ( | ||
| get_data_ptr( | ||
| warm_start_data.last_restart_duality_gap_dual_solution # noqa | ||
| ) | ||
| ) | ||
| c_solver_settings.set_pdlp_warm_start_data( | ||
| <const double *> c_current_primal_solution, | ||
| <const double *> c_current_dual_solution, | ||
| <const double *> c_initial_primal_average, | ||
| <const double *> c_initial_dual_average, | ||
| <const double *> c_current_ATY, | ||
| <const double *> c_sum_primal_solutions, | ||
| <const double *> c_sum_dual_solutions, | ||
| <const double *> c_last_restart_duality_gap_primal_solution, | ||
| <const double *> c_last_restart_duality_gap_dual_solution, | ||
| warm_start_data.last_restart_duality_gap_primal_solution.shape[0], # Primal size # noqa | ||
| warm_start_data.last_restart_duality_gap_dual_solution.shape[0], # Dual size # noqa | ||
| warm_start_data.initial_primal_weight, | ||
| warm_start_data.initial_step_size, | ||
| warm_start_data.total_pdlp_iterations, | ||
| warm_start_data.total_pdhg_iterations, | ||
| warm_start_data.last_candidate_kkt_score, | ||
| warm_start_data.last_restart_kkt_score, | ||
| warm_start_data.sum_solution_weight, | ||
| warm_start_data.iterations_since_last_restart # noqa | ||
| ) |
There was a problem hiding this comment.
Validate every warm-start buffer against the same primal/dual sizes.
Lines 438-439 derive primal_size / dual_size from the two last_restart_duality_gap_* arrays, but the other seven buffers are passed as raw pointers without any shape check. solver_wrapper.pyx only validates current_primal_solution and current_dual_solution against the problem dimensions, so an inconsistent auxiliary buffer here can still make set_pdlp_warm_start_data() read past the end of one array during Solve() or dump_parameters_to_file().
🛡️ Suggested guard
if self.get_pdlp_warm_start_data() is not None:
from cuopt.linear_programming.solver.solver_wrapper import (
get_data_ptr,
)
warm_start_data = self.get_pdlp_warm_start_data()
+ primal_size = warm_start_data.current_primal_solution.shape[0]
+ dual_size = warm_start_data.current_dual_solution.shape[0]
+
+ primal_fields = (
+ "initial_primal_average",
+ "sum_primal_solutions",
+ "last_restart_duality_gap_primal_solution",
+ )
+ dual_fields = (
+ "initial_dual_average",
+ "current_ATY",
+ "sum_dual_solutions",
+ "last_restart_duality_gap_dual_solution",
+ )
+
+ for field in primal_fields:
+ if getattr(warm_start_data, field).shape[0] != primal_size:
+ raise ValueError(
+ f"Invalid PDLPWarmStart data: {field} has inconsistent primal size"
+ )
+ for field in dual_fields:
+ if getattr(warm_start_data, field).shape[0] != dual_size:
+ raise ValueError(
+ f"Invalid PDLPWarmStart data: {field} has inconsistent dual size"
+ )
+
c_current_primal_solution = (
get_data_ptr(
warm_start_data.current_primal_solution # noqa
@@
c_solver_settings.set_pdlp_warm_start_data(
<const double *> c_current_primal_solution,
<const double *> c_current_dual_solution,
@@
- warm_start_data.last_restart_duality_gap_primal_solution.shape[0], # Primal size # noqa
- warm_start_data.last_restart_duality_gap_dual_solution.shape[0], # Dual size # noqa
+ primal_size,
+ dual_size,
warm_start_data.initial_primal_weight,🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@python/cuopt/cuopt/linear_programming/solver_settings/solver_settings.pyx`
around lines 377 - 448, The warm-start arrays from get_pdlp_warm_start_data()
are only partially size-checked: ensure every buffer
(warm_start_data.current_primal_solution, current_dual_solution,
initial_primal_average, initial_dual_average, current_ATY, sum_primal_solutions,
sum_dual_solutions, last_restart_duality_gap_primal_solution,
last_restart_duality_gap_dual_solution) is validated against the derived
primal_size and dual_size (use the shapes used for last_restart_duality_gap_* to
compute primal_size/dual_size) before calling get_data_ptr() and
c_solver_settings.set_pdlp_warm_start_data; if any shape mismatches,
raise/handle an error so set_pdlp_warm_start_data cannot receive inconsistent
pointers. Use the existing symbols get_pdlp_warm_start_data,
warm_start_data.<field>, get_data_ptr, and
c_solver_settings.set_pdlp_warm_start_data to locate and implement the checks.
|
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🔔 Hi @anandhkb, this pull request has had no activity for 7 days. Please update or let us know if it can be closed. Thank you! If this is an "epic" issue, then please add the "epic" label to this issue. |
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/ok to test 5e61083 |
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@coderabbitai review |
✅ Actions performedReview triggered.
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/ok to test 5e0a4b8 |
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/merge |
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/ok to test 98fcdcc |
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/ok to test 3007054 |
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/ok to test b45d214 |
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/merge |
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/ok to test 50937b3 |
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This PR's base branch has been changed since the last |
10 similar comments
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This PR's base branch has been changed since the last |
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This PR's base branch has been changed since the last |
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This PR's base branch has been changed since the last |
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This PR's base branch has been changed since the last |
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This PR's base branch has been changed since the last |
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This PR's base branch has been changed since the last |
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This PR's base branch has been changed since the last |
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This PR's base branch has been changed since the last |
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This PR's base branch has been changed since the last |
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This PR's base branch has been changed since the last |
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/merge |
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