Add Semantic Attacks PyTorch

[sarathknv]

Description

Implementation of single semantic attacks on PyTorch image classifiers. The attacks are generated by perturbing hue, saturation, contrast, brightness, and rotation.

Paper: https://openaccess.thecvf.com/content/CVPR2023/papers/Hsiung_Towards_Compositional_Adversarial_Robustness_Generalizing_Adversarial_Training_to_Composite_Semantic_CVPR_2023_paper.pdf

Fixes #2126

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.

• Unit tests
• Notebook example

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 #2200 (643d6fb) into dev_1.15.0 (4bfed67) will decrease coverage by 16.42%.
The diff coverage is 18.48%.

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@@               Coverage Diff               @@
##           dev_1.15.0    #2200       +/-   ##
===============================================
- Coverage       85.68%   69.26%   -16.42%     
===============================================
  Files             306      313        +7     
  Lines           27022    28081     +1059     
  Branches         4962     5168      +206     
===============================================
- Hits            23153    19451     -3702     
- Misses           2599     7481     +4882     
+ Partials         1270     1149      -121     

Impacted Files	Coverage Δ
...on/semantic_attacks/brightness_gradient_pytorch.py	17.83% <17.83%> (ø)
...sion/semantic_attacks/contrast_gradient_pytorch.py	17.83% <17.83%> (ø)
...s/evasion/semantic_attacks/hue_gradient_pytorch.py	17.83% <17.83%> (ø)
...on/semantic_attacks/saturation_gradient_pytorch.py	17.83% <17.83%> (ø)
art/attacks/evasion/__init__.py	98.24% <100.00%> (+0.03%)	⬆️
art/attacks/evasion/semantic_attacks/__init__.py	100.00% <100.00%> (ø)

... and 80 files with indirect coverage changes