[Feature] Add support for mask diagonal flip in TTA

[yeliudev]

Add support for mask diagonal flip in mmdet/core/post_processing/merge_augs.py for test-time augmentation.

[codecov]

Codecov Report

Merging #5403 (9428cae) into master (0e09f00) will increase coverage by 0.05%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #5403      +/-   ##
==========================================
+ Coverage   65.01%   65.06%   +0.05%     
==========================================
  Files         275      276       +1     
  Lines       21262    21293      +31     
  Branches     3537     3542       +5     
==========================================
+ Hits        13824    13855      +31     
+ Misses       6687     6686       -1     
- Partials      751      752       +1     

Flag	Coverage Δ
unittests	65.03% <66.66%> (+0.05%)	⬆️

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

Impacted Files	Coverage Δ
mmdet/datasets/pipelines/test_time_aug.py	95.65% <ø> (ø)
mmdet/core/post_processing/merge_augs.py	73.97% <66.66%> (+3.97%)	⬆️
mmdet/models/backbones/ssd_vgg.py	65.90% <0.00%> (-21.75%)	⬇️
mmdet/models/dense_heads/ssd_head.py	87.37% <0.00%> (-5.40%)	⬇️
mmdet/models/necks/__init__.py	100.00% <0.00%> (ø)
mmdet/models/necks/ssd_neck.py	100.00% <0.00%> (ø)
mmdet/models/roi_heads/grid_roi_head.py	66.30% <0.00%> (+0.37%)	⬆️
mmdet/models/roi_heads/mask_heads/grid_head.py	96.41% <0.00%> (+1.02%)	⬆️
mmdet/core/bbox/transforms.py	87.50% <0.00%> (+7.14%)	⬆️

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[ZwwWayne]

Hi @yeliudev ,
Thanks for the PR, would you like to also write a unit test for that?

[yeliudev]

Hi @yeliudev ,
Thanks for the PR, would you like to also write a unit test for that?

Thanks for your review. I've added the unit tests but I'm not sure whether they are in the right place.