Canonical type comparison

[AryazE]

Description

In Numpy

import numpy as np
a = np.array([1.1, 2.2])
print(a.dtype) # dtype('float64')
print(a.dtype == None) # True

Therefore, comparisons of dtypes should be done with is. It is also the canonical way of exact type comparison in Python.

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
• My changes have been tested using both CPU and GPU devices

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 84.42%. Comparing base (2f62c14) to head (7d5950b).

Files with missing lines	Patch %	Lines
art/attacks/evasion/fast_gradient.py	0.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2492      +/-   ##
==========================================
- Coverage   85.24%   84.42%   -0.83%     
==========================================
  Files         329      329              
  Lines       30143    30143              
  Branches     5173     5173              
==========================================
- Hits        25696    25447     -249     
- Misses       3019     3284     +265     
+ Partials     1428     1412      -16     

Files with missing lines	Coverage Δ
art/estimators/tensorflow.py	78.00% <100.00%> (ø)
art/attacks/evasion/fast_gradient.py	86.01% <0.00%> (ø)

... and 3 files with indirect coverage changes