add cbam module

[rentainhe]

Trying to implement Cbam Module in glasses

Original Paper

address: https://arxiv.org/abs/1807.06521

Short Explanation

Cbam Module improves SE Module in these ways:

• It catches the attention not only use the global_avg_pool result, but also the global_max_pool result.
• It adds the spatial attention using a Conv2d Layer on the mean and max features of the spatial space.

TODO

• [x] Build Cbam Module
• [x] Add Doc String

[FrancescoSaverioZuppichini]

Hi @rentainhe thank you for this PR. Could you please provide a little bit of context? It would be nice if you can edit the description an explain what cbam does and link the paper. It looks similar to Channel + Spatial SE. So I am wondering what's the improvement, I see we concatenate the features from two poolings, would love to have your summary about it.

Tests are missing, you can add a test here https://github.com/FrancescoSaverioZuppichini/glasses/blob/master/test/test_att.py

[rentainhe]

Hi @rentainhe thank you for this PR. Could you please provide a little bit of context? It would be nice if you can edit the description an explain what cbam does and link the paper. It looks similar to Channel + Spatial SE. So I am wondering what's the improvement, I see we concatenate the features from two poolings, would love to have your summary about it.

Tests are missing, you can add a test here https://github.com/FrancescoSaverioZuppichini/glasses/blob/master/test/test_att.py

OKKKK, wait a minute~

[codecov-commenter]

Codecov Report

Merging #279 (4ecefee) into master (bbd8e7c) will increase coverage by 0.05%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #279      +/-   ##
==========================================
+ Coverage   97.23%   97.28%   +0.05%     
==========================================
  Files          82       86       +4     
  Lines        2998     3056      +58     
==========================================
+ Hits         2915     2973      +58     
  Misses         83       83              

Impacted Files	Coverage Δ
glasses/models/AutoModel.py	78.72% <ø> (ø)
glasses/models/base/__init__.py	100.00% <ø> (ø)
glasses/models/base/protocols.py	100.00% <ø> (ø)
glasses/models/utils/scaler.py	100.00% <ø> (ø)
glasses/nn/__init__.py	100.00% <ø> (ø)
glasses/nn/att/CBAM.py	100.00% <ø> (ø)
glasses/nn/att/ECA.py	100.00% <ø> (ø)
glasses/nn/att/__init__.py	100.00% <ø> (ø)
glasses/nn/att/se.py	100.00% <ø> (ø)
glasses/nn/att/utils.py	100.00% <ø> (ø)
... and 21 more

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