[WIP] Add HRSC dataset. Move eval_map to mmrotate.core.evaluation

[liuyanyi]

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Motivation

Add HRSC dataset.
Move eval_map to mmrotate.core.evaluation, like mmdet.core.evaluation, now dota and hrsc share same code of eval_map.

Modification

Implemented HRSCDataset based on XMLDataset in mmdet and HRSCDataset in OBBDetection.
Move evaluation code to mmrotate.core.evaluation.

BC-breaking (Optional)

Does the modification introduce changes that break the back-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. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov-commenter]

Codecov Report

Merging #54 (cda1082) into dev (dd40984) will decrease coverage by 0.44%.
The diff coverage is 12.97%.

@@            Coverage Diff             @@
##              dev      #54      +/-   ##
==========================================
- Coverage   28.76%   28.31%   -0.45%     
==========================================
  Files         102      106       +4     
  Lines        6571     6820     +249     
  Branches      985     1031      +46     
==========================================
+ Hits         1890     1931      +41     
- Misses       4617     4825     +208     
  Partials       64       64              

Flag	Coverage Δ
unittests	28.29% <12.97%> (-0.45%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmrotate/core/evaluation/eval_map.py	7.58% <7.58%> (ø)
mmrotate/core/evaluation/recall.py	10.09% <10.09%> (ø)
mmrotate/datasets/hrsc.py	16.03% <16.03%> (ø)
mmrotate/core/__init__.py	100.00% <100.00%> (ø)
mmrotate/core/evaluation/__init__.py	100.00% <100.00%> (ø)
mmrotate/datasets/__init__.py	100.00% <100.00%> (ø)
mmrotate/datasets/dota.py	15.78% <100.00%> (+4.61%)	⬆️

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[zytx121]

Hi @liuyanyi
We welcome you to add new datasets to MMRotate! Thank you very much!
However, we recommend that you PR Move eval_map to mmrotate.core.evaluation firstly. You better split this PR into 2 PRs.

[liuyanyi]

Hi @liuyanyi We welcome you to add new datasets to MMRotate! Thank you very much! However, we recommend that you PR Move eval_map to mmrotate.core.evaluation firstly. You better split this PR into 2 PRs.

Sure, I will split that to 2 PRs