fix(metrics): Corrected dimension count in MS-SSIM error message for 3D images.

[akshatsinha0]

Fixes # .

Description

A few sentences describing the changes proposed in this pull request.

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

Corrected a dimensionality validation error message in the compute_ms_ssim function within monai/metrics/regression.py. The message now accurately reflects that when spatial_dims is 3, the expected input tensor dimensionality is 5 dimensions rather than 4. This is a single-line fix with no changes to function logic or control flow.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description uses the template structure but the actual description content is entirely placeholder text with no specific details about the MS-SSIM fix.	Replace placeholder text with a clear description of the dimension validation bug, explain why the message was incorrect, and detail the fix applied.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: correcting a dimension count error in the MS-SSIM validation message for 3D images, matching the actual changeset.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

• 📝 Generate docstrings

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📥 Commits

Reviewing files that changed from the base of the PR and between 57fdd59 and 72aaf1c.

📒 Files selected for processing (1)

• monai/metrics/regression.py

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📓 Path-based instructions (1)

**/*.py

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Files:

• monai/metrics/regression.py

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🔇 Additional comments (1)

monai/metrics/regression.py (1)

540-544: Error message correction is accurate.

The validation correctly requires 5 dimensions for 3D images (batch, channel, height, width, depth) and the error message matches this requirement. Aligns with SSIMMetric's consistent validation at lines 304-308.

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[akshatsinha0]

@rijobro

[ericspod]

Looks good to me, thanks!