fix(metrics): stop passing deprecated always_return_as_numpy internally (Fixes #9059)

[venki-drn]

Fixes #9059 .

Description

get_mask_edges() is decorated with @deprecated_arg(name="always_return_as_numpy", since="1.5.0", removed="1.7.0"), but get_edge_surface_distance() in the same module called it with always_return_as_numpy=False (monai/metrics/utils.py:363).

SurfaceDistanceMetric and HausdorffDistanceMetric both route through that helper, so every metric computation emitted a FutureWarning about an argument the caller never passed and could not suppress. It surfaces in ordinary validation loops. Separately, the argument is scheduled for removal in 1.7.0, and this internal call site would have blocked that removal.

False is already the parameter default, so the keyword is simply dropped:

-    edges_pred, edges_gt, *areas = get_mask_edges(
-        y_pred, y, crop=True, spacing=edges_spacing, always_return_as_numpy=False
-    )
+    edges_pred, edges_gt, *areas = get_mask_edges(y_pred, y, crop=True, spacing=edges_spacing)

This adds tests/metrics/test_metrics_internal_deprecation.py, asserting that neither metric raises a MONAI-internal DeprecationWarning or FutureWarning. The test filters warnings by originating file, so unrelated deprecations from torch or numpy cannot make it pass or fail spuriously. Note the warning raised here is a FutureWarning, not a DeprecationWarning - a test checking only the latter would pass vacuously.

Verification

The new test fails against unpatched dev on both metrics, confirming they share the helper:

$ python tests/metrics/test_metrics_internal_deprecation.py -v
  ... (metric='SurfaceDistanceMetric')   ... FAIL
  ... (metric='HausdorffDistanceMetric') ... FAIL
Ran 1 test in 0.033s
FAILED (failures=2)

and passes with the fix applied:

$ python tests/metrics/test_metrics_internal_deprecation.py -v
test_surface_and_hausdorff_emit_no_internal_deprecation_warnings ... ok
OK

Existing metric suites:

$ python -m pytest tests/metrics/test_surface_distance.py tests/metrics/test_hausdorff_distance.py -q
71 passed, 38 warnings in 7.05s

./runtests.sh --codeformat passes (copyright headers 1354 files, isort, black 1317 files unchanged, ruff).

Numerical results are unchanged - measured over three metric calls on identical inputs:

	deprecation warnings	SurfaceDistance	Hausdorff	SurfaceDistance reversed
before	3	1.173913	4.000000	1.400000
after	0	1.173913	4.000000	1.400000

Note on scope: this deliberately does not remove the always_return_as_numpy parameter itself, since it is documented as removed in 1.7.0 and external callers may still be passing it. Happy to extend this PR to the full removal if you would prefer to land it now.

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests --disttests.
• In-line docstrings updated.
• Documentation updated, tested make html command in the docs/ folder.

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---

📝 Walkthrough

Walkthrough

get_edge_surface_distance no longer passes the deprecated always_return_as_numpy=False argument to get_mask_edges. Tests verify that SurfaceDistanceMetric and HausdorffDistanceMetric produce no MONAI-internal deprecation or future warnings.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to b4485

This localized change stops internal deprecation warnings without changing metric results, and the affected metrics have focused regression coverage; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the metrics fix and the deprecated argument removed from the internal call.
Description check	✅ Passed	The description includes the issue reference, change details, test coverage, verification results, and applicable change type.
Linked Issues check	✅ Passed	The changes remove the redundant deprecated keyword, preserve behavior, prevent internal warnings, and add a focused regression test for issue #9059.
Out of Scope Changes check	✅ Passed	All changes directly support issue #9059 by fixing the internal warning and adding relevant regression coverage.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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Actionable comments posted: 1

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Inline comments:
In `@tests/metrics/test_metrics_internal_deprecation.py`:
- Around line 26-31: Update _internal_deprecation_warnings with Google-style
Args and Returns sections documenting its callable input and collected warning
output, and add a docstring to
test_surface_and_hausdorff_emit_no_internal_deprecation_warnings describing its
return value. Keep the implementation unchanged.

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