Fix: handle zero division error in binary IoU calculation

[rittik9]

…tion

What does this PR do?

Fixes #2658

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

Did you have fun?

Yes

Issue:

zero_division does not work for binary IoU (Jaccard index) calculation and returns NaN when TP + FP + FN=0.

Reason:

The zero_division parameter in the BinaryJaccardIndex does not take effect during binary task calculations, as the IoU calculations for the binary task are returned early (Line 70) in _jaccard_index_reduce function.

Fix:

The change replaces the direct division operation with a call to the _safe_divide function, which handles the case of division by zero based on the specified zero_division parameter in _jaccard_index_reduce function.

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📚 Documentation preview 📚: https://torchmetrics--2726.org.readthedocs.build/en/2726/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41%. Comparing base (eecc55b) to head (31087e3).
Report is 92 commits behind head on master.

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HEAD has 4 uploads less than BASE

Flag	BASE (eecc55b)	HEAD (31087e3)
gpu	2	0
unittest	2	0

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #2726     +/-   ##
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- Coverage      69%     41%    -28%     
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  Files         329     316     -13     
  Lines       18065   17901    -164     
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- Hits        12491    7329   -5162     
- Misses       5574   10572   +4998