Printable representation of Attack objects [JATIC-I2-IBM]

[kieranfraser]

Description

Facilitating printable representation of attacks. Aids users distinguish between attacks of the same type but different parameters without having to manually inspect or print individual parameters, they can simply print the attack object. This PR also adds a missing attack_param, decay, to ProjectedGradientDescentCommon to ensure it appears in when Numpy, TensorFlow and PyTorch PGD attacks are printed.

Fixes #2272

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.

• tests/attacks/test_attack.py - added a base class test for __repr__

Test Configuration:

• OS: macOS
• Python version: 3.10
• ART version or commit number: dev_1.16.0
• 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 #2274 (08bf83f) into dev_1.16.0 (161c406) will decrease coverage by 14.65%.
The diff coverage is 20.00%.

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@@               Coverage Diff               @@
##           dev_1.16.0    #2274       +/-   ##
===============================================
- Coverage       83.87%   69.23%   -14.65%     
===============================================
  Files             318      318               
  Lines           28329    28338        +9     
  Branches         5157     5161        +4     
===============================================
- Hits            23761    19619     -4142     
- Misses           3243     7588     +4345     
+ Partials         1325     1131      -194     

Files Changed	Coverage Δ
art/attacks/attack.py	87.24% <11.11%> (-5.61%)	⬇️
...adient_descent/projected_gradient_descent_numpy.py	88.04% <100.00%> (ø)

... and 83 files with indirect coverage changes

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[beat-buesser]

Hi @kieranfraser Thank you very much for your pull request adding rear-strings to the attacks!