Update coco_metric.py

[yarkable]

Thanks for your contribution and we appreciate it a lot. The following instructions would make your pull request more healthy and more easily get feedback. If you do not understand some items, don't worry, just make the pull request and seek help from maintainers.

Motivation

This PR helps Visualize per-category performance of AP, AP_50, AP_75, AP_s, AP_m and AP_l.

Modification

add some elements to the results_per_category

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repos?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMCls.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[hhaAndroid]

@yarkable Thank you for your contribution. Can you explain the effect before and after the change in the pr message?

[yarkable]

@hhaAndroid
Hi, before the modification, the per-category output result is like:

After the pr, the per-category output result:

[yarkable]

@hhaAndroid
Hi, in the lint stage, it throws an error:

yapf.....................................................................Failed
- hook id: yapf
- files were modified by this hook

Could you please tell me how to fix this?

[hhaAndroid]

@yarkable pre-commit run --all-files then git commit ...