Issue #, if available:

Description of changes: When passing distribution dict to estimator API PyTorch, we can let smp_config be either a dict (current behavior) or a string representing a config file.

            distribution = {
                "smdistributed": {
                    "modelparallel": {
                        "enabled": True,
                        "parameters": smp_config,
                    },
                },
                ...
            }

The config file needs to be a json file. e.g., params.json

{"partitions": 1, "tensor_parallel_degree": 2, "microbatches": 1, "optimize": "speed", "pipeline": "interleaved", "ddp": 1, "auto_partition": false, "default_partition": 0}

Testing done: local unit tests

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Jul 26 '22 14:07 yongyanrao

AWS CodeBuild CI Report

CodeBuild project: sagemaker-python-sdk-slow-tests
Commit ID: a74160998675df1fe87dff39f9254e1413686907
Result: FAILED
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Jul 26 '22 15:07 sagemaker-bot

AWS CodeBuild CI Report

CodeBuild project: sagemaker-python-sdk-unit-tests
Commit ID: a74160998675df1fe87dff39f9254e1413686907
Result: SUCCEEDED
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Jul 26 '22 15:07 sagemaker-bot

Codecov Report

Merging #3265 (46ee21e) into master (1fa2377) will decrease coverage by 0.01%. The diff coverage is 75.00%.

:exclamation: Current head 46ee21e differs from pull request most recent head 05604ec. Consider uploading reports for the commit 05604ec to get more accurate results

@@            Coverage Diff             @@
##           master    #3265      +/-   ##
==========================================
- Coverage   89.17%   89.15%   -0.02%     
==========================================
  Files         204      204              
  Lines       18979    18922      -57     
==========================================
- Hits        16924    16870      -54     
+ Misses       2055     2052       -3

Impacted Files	Coverage Δ
src/sagemaker/fw_utils.py	`90.15% <75.00%> (-0.98%)`	:arrow_down:
src/sagemaker/training_compiler/config.py	`82.05% <0.00%> (-1.29%)`	:arrow_down:
src/sagemaker/huggingface/estimator.py	`93.18% <0.00%> (-1.27%)`	:arrow_down:
src/sagemaker/model.py	`92.87% <0.00%> (-0.25%)`	:arrow_down:
src/sagemaker/estimator.py	`89.41% <0.00%> (-0.10%)`	:arrow_down:
src/sagemaker/workflow/clarify_check_step.py	`96.87% <0.00%> (-0.04%)`	:arrow_down:
src/sagemaker/clarify.py	`95.65% <0.00%> (-0.03%)`	:arrow_down:
src/sagemaker/workflow/quality_check_step.py	`99.20% <0.00%> (-0.02%)`	:arrow_down:
src/sagemaker/inputs.py	`100.00% <0.00%> (ø)`
src/sagemaker/network.py	`100.00% <0.00%> (ø)`
... and 27 more