Addition of SmoothAdversarial and MACER Implementation in the Randomized Smoothing Module

[archit-g]

Description

• Addition of SmoothAdversarial and MACER Implementation in the Randomized Smoothing Module
• Support for SmoothAdversarial implementation in PyTorch and Tensorflow
• Support for MACER implementation in PyTorch
• Example notebooks for the new modules added
• Unit tests for the new modules added

Links to Paper and Authors' code repository:

• SmoothAdversarial: https://arxiv.org/abs/1906.04584 (https://github.com/Hadisalman/smoothing-adversarial/)
• MACER: https://openreview.net/pdf?id=rJx1Na4Fwr (https://github.com/RuntianZ/macer)

Fixes # (issue)

Type of change

Please check all relevant options.

• Improvement (non-breaking)
• Bug fix (non-breaking)
• New feature (non-breaking)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Testing

Please describe the tests that you ran to verify your changes. Consider listing any relevant details of your test configuration.

• Test A
• Test B

Test Configuration:

• OS
• Python version
• ART version or commit number
• TensorFlow / Keras / PyTorch / MXNet version

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov-commenter]

Codecov Report

Merging #1968 (7c41c98) into dev_1.13.0 (0d481ca) will increase coverage by 11.95%.
The diff coverage is 62.45%.

@@               Coverage Diff               @@
##           dev_1.13.0    #1968       +/-   ##
===============================================
+ Coverage       73.25%   85.20%   +11.95%     
===============================================
  Files             257      289       +32     
  Lines           23928    25178     +1250     
  Branches         4346     4497      +151     
===============================================
+ Hits            17529    21454     +3925     
+ Misses           5417     2574     -2843     
- Partials          982     1150      +168     

Impacted Files	Coverage Δ
...fication/randomized_smoothing/macer/train_macer.py	51.61% <51.61%> (ø)
...ed_smoothing/smooth_adversarial/train_smoothadv.py	66.32% <66.32%> (ø)
...tors/certification/randomized_smoothing/pytorch.py	84.15% <73.33%> (+0.06%)	⬆️
...s/certification/randomized_smoothing/tensorflow.py	89.18% <76.47%> (-2.20%)	⬇️
...rtification/randomized_smoothing/macer/__init__.py	100.00% <100.00%> (ø)
...ation/randomized_smoothing/randomized_smoothing.py	97.67% <100.00%> (+0.34%)	⬆️
...andomized_smoothing/smooth_adversarial/__init__.py	100.00% <100.00%> (ø)
art/estimators/certification/abstain.py	90.90% <0.00%> (-9.10%)	⬇️
art/estimators/keras.py	78.94% <0.00%> (-7.72%)	⬇️
art/estimators/poison_mitigation/strip/strip.py	94.44% <0.00%> (-5.56%)	⬇️
... and 96 more

[f4str]

@beat-buesser this should be closed in favor of #2218

[beat-buesser]

Closing this pull request and replacing it with #2218