Changed the deprecated usage of torch.Tensor.grad.data

[HridayM25]

Description

Fix #3217

Type of change

Please check the option that is related to your PR.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
  • In this case, we recommend to discuss your modification on GitHub issues before creating the PR
• Documentations (modification for documents)

Checklist

• My code follows the style guidelines of this project
  • Run yapf -i <modified file> and check no errors (yapf version must be 0.32.0)
  • Run mypy -p deepchem and check no errors
  • Run flake8 <modified file> --count and check no errors
  • Run python -m doctest <modified file> and check no errors
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

[rbharath]

@shaipranesh2 Can you review this PR?

[shaipranesh2]

@HridayM25 The code formatting test are failing due to change in yapf version

[HridayM25]

@shaipranesh2 Thanks for the review! I am using yapf whose version is 0.32.0. How should I proceed?

[shaipranesh2]

@HridayM25 Rest seems fine as detach() here does not alter the computation graph of the KFAC. Should be ready to merge once code formatting tests pass

[HridayM25]

@shaipranesh2 Right, the computation graph is not affected with detach. What should I do to ensure the code formatting tests pass?

[shaipranesh2]

@shaipranesh2 Thanks for the review! I am using yapf whose version is 0.32.0. How should I proceed?

I am not sure then. The CI tests expected a different formatting than the one in this PR. So check the logs and rerun the yapf command maybe.

[HridayM25]

@shaipranesh2 I checked the logs, and I have made the necessary changes. I also ran yapf afterwards and it gave me no errors.

[HridayM25]

@rbharath @shaipranesh2 The formatting issue seems to be solved now.

[rbharath]

LGTM

[rbharath]

LGTM