add ms_deformable_attn in parrots

[luopeichao]

Modification

• Add ms_deformable_attn support in parrots.
• Modify parrots ext_module loading strategy. Now you will get a fake function if the function you try to load is not implemented in parrots, and the fake function can raise exception when you call it.

[codecov]

Codecov Report

Merging #1042 (d224841) into master (1a66977) will increase coverage by 0.02%.
The diff coverage is 0.00%.

❗ Current head d224841 differs from pull request most recent head 5b16b5b. Consider uploading reports for the commit 5b16b5b to get more accurate results

@@            Coverage Diff             @@
##           master    #1042      +/-   ##
==========================================
+ Coverage   65.32%   65.35%   +0.02%     
==========================================
  Files         154      156       +2     
  Lines        9895     9984      +89     
  Branches     1801     1813      +12     
==========================================
+ Hits         6464     6525      +61     
- Misses       3100     3122      +22     
- Partials      331      337       +6     

Flag	Coverage Δ
unittests	65.35% <0.00%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
mmcv/ops/multi_scale_deform_attn.py	69.69% <0.00%> (-6.97%)	⬇️
mmcv/utils/ext_loader.py	38.23% <0.00%> (-13.77%)	⬇️
mmcv/ops/modulated_deform_conv.py	49.56% <0.00%> (-0.88%)	⬇️
mmcv/cnn/utils/weight_init.py	91.15% <0.00%> (-0.75%)	⬇️
mmcv/cnn/__init__.py	100.00% <0.00%> (ø)
mmcv/cnn/utils/__init__.py	100.00% <0.00%> (ø)
mmcv/runner/hooks/__init__.py	100.00% <0.00%> (ø)
mmcv/runner/hooks/logger/__init__.py	100.00% <0.00%> (ø)
mmcv/cnn/bricks/generalized_attention.py	92.81% <0.00%> (ø)
mmcv/commit_id.py	0.00% <0.00%> (ø)
... and 2 more

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[ZwwWayne]

PR can be merged after fixing lint issues.