[Fix] Fix the bug in binary cross entropy loss

[wangbo-zhao]

Motivation

Fix the bug in binary cross entropy loss when using multi-label datasets e.g.VOC2007

The issue from #1495 .

Fix CI according to some experiments, From mim install -e . --> mim install .

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects, like MMDet or MMSeg.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.53 🎉

Comparison is base (c9a0cb0) 84.37% compared to head (3a9c48c) 84.90%.

❗ Current head 3a9c48c differs from pull request most recent head b4e1f70. Consider uploading reports for the commit b4e1f70 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1499      +/-   ##
==========================================
+ Coverage   84.37%   84.90%   +0.53%     
==========================================
  Files         142      230      +88     
  Lines        9925    17558    +7633     
  Branches     1621     2758    +1137     
==========================================
+ Hits         8374    14908    +6534     
- Misses       1277     2132     +855     
- Partials      274      518     +244     

Flag	Coverage Δ
unittests	84.90% <ø> (+0.53%)	⬆️

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see 372 files with indirect coverage changes

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