Bug Fixes and Other Changes
* removed unused import statment
* forgot to run black on torch_distributed.py after updating my comments from last commit
* Modified my comment on line 98-103 in torch_distrbuted.py to comply with formatting standard.
* Revert "Ran black on entire sagemaker-trianing-toolkit directory"
* Ran black on entire sagemaker-trianing-toolkit directory
* Ran Black (python formatter) on the files with my code updates (torch_distributed.py and test_torch_distributed.py)
* Added test for neuron_parallel_compile in test_torch_distributed.py
* Updated comment syntax based on feedback in pull request as well as added full example of the neuron_parallel_compile command as it would appear in the command line
* added unit test for neuron_parallel_compile code change
* Updated torch_distributed.py