Add tensorflow tensor support

[darshil929]

Changes

• Added support for ord=0 in tf_linalg.py's norm function
• Fixed the keepdims parameter for nuclear norm case
• Added tests that check norm with keepdims=True for both CPU and GPU classes
• Added tests for lstsq function with multiple right-hand sides (rank-2 tensors)

Reason for changes

Right now TensorFlow tensors don't work with nncf.Tensor, which is blocking issue #3041 from being done. This PR adds TensorFlow backend support so we can use TensorFlow tensors with NNCF operations. I'm continuing the work from PR #3106 but fixing some things reviewers pointed out and adding stuff that was missing.

Related tickets

#3041
#3106

Tests

• Added a test_norm_keepdims function to both CPU and GPU classes to check if keepdims works right
• Added test_lstsq_rank2 to make sure least squares works with multiple columns
• Note: I've added the requested tests, but encountered environment setup issues that prevented me from running them successfully. The error appears to be related to function signature registration in the TensorFlow backend integration, which I think is beyond the scope of my changes

[darshil929]

@kshpv

I've implemented the suggested change to the save_file.register decorator. I've also fixed string literals in exceptions in tf_linalg.py and tf_numeric.py to address the pre-commit linting issues that were causing CI failures. The PR should be ready for review now.

[kshpv]

@kshpv

I've implemented the suggested change to the save_file.register decorator. I've also fixed string literals in exceptions in tf_linalg.py and tf_numeric.py to address the pre-commit linting issues that were causing CI failures. The PR should be ready for review now.

Hi @darshil929
Could you please fix precommit issues at first?

[darshil929]

@kshpv
I've implemented the suggested change to the save_file.register decorator. I've also fixed string literals in exceptions in tf_linalg.py and tf_numeric.py to address the pre-commit linting issues that were causing CI failures. The PR should be ready for review now.

Hi @darshil929 Could you please fix precommit issues at first?

I'm analyzing the precommit issues now and will get them fixed as soon as possible.

[darshil929]

Hi @kshpv

Sir, I've made several changes to fix the type annotations and error handling issues in the backend implementation that were causing the mypy and pytest/tensorflow CI checks to fail. The changes include:

• Fixed missing return paths in device detection function
• Added proper type checking for axis parameters in various functions
• Fixed return type annotation mismatches
• Added proper type parameters to Callable and ndarray generic types
• Fixed device mapping type compatibility issues in tensor creation functions
• Added explicit type handling for expand_dims function to prevent iteration errors

Could you please review these changes and rerun the CI checks to verify they resolve the issues? Please let me know if any additional adjustments are needed.

Thank you!