[Fix] fix get_flops.py

[yxzhao2022]

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Motivation

Update get_flops.

Modification

Please briefly describe what modification is made in this PR.

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.

[zytx121]

LGTM

[codecov]

Codecov Report

Base: 60.95% // Head: 79.73% // Increases project coverage by +18.77% 🎉

Coverage data is based on head (449d60e) compared to base (e4ae563).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##           dev-1.x     #646       +/-   ##
============================================
+ Coverage    60.95%   79.73%   +18.77%     
============================================
  Files           95       95               
  Lines         6460     6460               
  Branches       915      915               
============================================
+ Hits          3938     5151     +1213     
+ Misses        2315     1011     -1304     
- Partials       207      298       +91     

Flag	Coverage Δ
unittests	?

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Impacted Files	Coverage Δ
mmrotate/evaluation/metrics/dota_metric.py	87.00% <0.00%> (-1.13%)	⬇️
mmrotate/models/task_modules/coders/angle_coder.py	44.55% <0.00%> (+1.98%)	⬆️
mmrotate/testing/_utils.py	83.62% <0.00%> (+5.17%)	⬆️
.../task_modules/assigners/rotate_iou2d_calculator.py	67.36% <0.00%> (+5.26%)	⬆️
mmrotate/models/dense_heads/rotated_fcos_head.py	68.85% <0.00%> (+6.55%)	⬆️
mmrotate/models/roi_heads/gv_ratio_roi_head.py	75.00% <0.00%> (+8.33%)	⬆️
...els/task_modules/coders/delta_xywht_hbbox_coder.py	99.13% <0.00%> (+17.24%)	⬆️
mmrotate/utils/misc.py	42.85% <0.00%> (+21.42%)	⬆️
...rotate/models/roi_heads/bbox_heads/gv_bbox_head.py	79.18% <0.00%> (+25.71%)	⬆️
.../task_modules/coders/distance_angle_point_coder.py	53.84% <0.00%> (+26.92%)	⬆️
... and 18 more

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