change classification metric classes

[Thiefwerty]

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Description

Replaced the StatisitcsMetric class with 3 classes for binary, multilabel and multiclass tasks.
Now these classes do not require num_classes to be specified, instead num_classes are returned by functions from _misc.py.

Related Issue

Type of Change

• Examples / docs / tutorials / contributors update
• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves an existing feature)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

Checklist

• Have you updated tests for the new functionality?
• Have you added your new classes/functions to the docs?
• Have you updated the CHANGELOG?
• Have you run colab minimal CI/CD with latest and minimal requirements?
• Have you checked XLA integration with single and multiple processes?

[pep8speaks]

Hello @Thiefwerty! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2021-12-25 13:25:44 UTC

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