Issue #, if available: Resolves https://github.com/aws/sagemaker-tensorflow-training-toolkit/issues/391

Description of changes: SageMaker Tensorflow Training ToolKit now supports Multi Worker Mirrored Strategy through cluster initialization. These changes allow the cluster init to be invoked through the TF Estimator's distribution parameter.

Testing done: PR validation tests

Merge Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your pull request.

General

[x] I have read the CONTRIBUTING doc
[x] I certify that the changes I am introducing will be backword compatible, and I have discussed concerns about this, if any, with the Python SDK team
[x] I used the commit message format described in CONTRIBUTING
[x] I have passed the region in to all S3 and STS clients that I've initialized as part of this change.
[x] I have updated any necessary documentation, including READMEs and API docs (if appropriate)

Tests

[x] I have added tests that prove my fix is effective or that my feature works (if appropriate)
[x] I have added unit and/or integration tests as appropriate to ensure backward compatibility of the changes
[x] I have checked that my tests are not configured for a specific region or account (if appropriate)
[x] I have used unique_name_from_base to create resource names in integ tests (if appropriate)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Jun 22 '22 19:06 Lokiiiiii

AWS CodeBuild CI Report

CodeBuild project: sagemaker-python-sdk-unit-tests
Commit ID: 0c15bc7cde9ab8cc37194ee2a792bf9610aca1d1
Result: FAILED
Build Logs (available for 30 days)

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Jun 22 '22 19:06 sagemaker-bot

AWS CodeBuild CI Report

CodeBuild project: sagemaker-python-sdk-unit-tests
Commit ID: d4d4b8369dee26318a288767b727b0aa65afc8cd
Result: FAILED
Build Logs (available for 30 days)

Powered by github-codebuild-logs, available on the AWS Serverless Application Repository

Jun 22 '22 20:06 sagemaker-bot

Codecov Report

Merging #3192 (a838741) into master (48141db) will decrease coverage by 0.78%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3192      +/-   ##
==========================================
- Coverage   89.56%   88.79%   -0.78%     
==========================================
  Files         968      227     -741     
  Lines       90696    22454   -68242     
==========================================
- Hits        81232    19937   -61295     
+ Misses       9464     2517    -6947

Impacted Files	Coverage Δ
src/sagemaker/tensorflow/estimator.py	`92.18% <ø> (ø)`
src/sagemaker/estimator.py	`89.89% <100.00%> (ø)`
...c/sagemaker/tensorflow/training_compiler/config.py	`95.83% <100.00%> (ø)`
...n3.7/site-packages/sagemaker/experiments/_utils.py
.../site-packages/sagemaker/experiments/_api_types.py
...-packages/sagemaker/dataset_definition/__init__.py
...thon3.10/site-packages/sagemaker/spark/__init__.py
.../sagemaker/cli/compatibility/v2/ast_transformer.py
.../site-packages/sagemaker/workflow/callback_step.py
...hon3.10/site-packages/sagemaker/jumpstart/enums.py
... and 1188 more