4160 Enhance mean dice

[yiheng-wang-nv]

Signed-off-by: Yiheng Wang vennw@nvidia.com

Fixes #4160 .

Description

This PR enhances the DiceMetric via adding an option to handle the empty ground truth cases.

Status

Ready

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.

[Nic-Ma]

Would be necessary to also this option in other metrics? I am not sure about that.
Need @dongyang0122 @ericspod @wyli @holgerroth to help evaluate from the research use cases angle.

Thanks in advance.

[ericspod]

I stated in the original issue before noticing this, but with the dice loss we have two distinct values for smoothing the numerator and denominator which can be set to allow the user to select which way to handle empty ground truths. I think we should have the same solution here for consistency rather than a special case for when the ground truth is empty.

[wyli]

I think this change improves the current dev codebase.

[wyli]

/build

[wyli]

/build