Fix CDMG xfails for numpy 2.4

[jcrist]

Numpy 2.4 no longer coerces 1 element arrays to scalars automatically. Small update to this line to support both 1-element alpha arrays and scalars. Fixes #7873.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 2e65466 and dbad904.

📒 Files selected for processing (2)

• python/cuml/cuml/solvers/cd_mg.pyx
• python/cuml/tests/dask/test_dask_coordinate_descent.py

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📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes

  • Improved robustness of parameter handling in the coordinate descent solver to correctly process scalar values in all cases.

• Tests

  • Removed version-dependent test conditions, enabling consistent test execution across all NumPy versions.

Walkthrough

This PR fixes a NumPy 2.4 compatibility issue where non-scalar array inputs could not be implicitly converted to C doubles in Cython. The fix explicitly checks scalar status and extracts scalar values before assignment, then removes corresponding test xfails that are no longer needed.

Changes

Cohort / File(s)	Summary
Cython scalar coercion fix python/cuml/cuml/solvers/cd_mg.pyx	Updated CDMG._fit to more robustly coerce self.alpha to C double by checking np.isscalar() and using .item() extraction for non-scalar values before assignment, addressing NumPy 2.4 implicit conversion restrictions.
Test cleanup python/cuml/tests/dask/test_dask_coordinate_descent.py	Removed NumPy version gating logic (packaging.version.Version and numpy_gte_24 flag) and associated pytest.mark.xfail conditions for unit-scale test cases, replacing them with unconditional parametrizations.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Suggested labels

Cython / Python

Suggested reviewers

• viclafargue

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: fixing CDMG xfails that were introduced due to NumPy 2.4 incompatibilities.
Description check	✅ Passed	The description clearly relates to the changeset, explaining the NumPy 2.4 issue with array-to-scalar coercion and referencing the specific fix.
Linked Issues check	✅ Passed	The changes address issue #7873 by modifying cd_mg.pyx to handle both scalar and 1-element arrays, and removing the corresponding xfails from the test file.
Out of Scope Changes check	✅ Passed	All changes are directly related to fixing the NumPy 2.4 compatibility issue: the alpha coercion fix in cd_mg.pyx and removal of xfails in test_dask_coordinate_descent.py.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[csadorf]

/merge