[GitHub] troychen728 opened a new pull request #3751: [AIRFLOW-2524] Add Amazon SageMaker Tuning

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troychen728 opened a new pull request #3751: [AIRFLOW-2524] Add Amazon SageMaker Tuning
URL: https://github.com/apache/incubator-airflow/pull/3751
 
 
   Make sure you have checked _all_ steps below.
   
   ### JIRA
   - [X] My PR addresses the following [Airflow JIRA](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. 
       - https://issues.apache.org/jira/browse/AIRFLOW-2524
   
   ### Description
   - [X] Here are some details about my PR, including screenshots of any UI changes:
       - This PR allows user to start a Amazon SageMaker Hyper_Parameter_Tuning job using the SageMakerCreateHyperParameterTuningJobOperator
       - User can also check the progress(state) of the tuning job through the SageMakerTuningSensor
   
   
   ### Tests
   - [X] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
        - tests/contrib/hooks/test_sagemaker_hook.py
        - tests/contrib/operators/test_sagemaker_create_tuning_job_operator.py
        - tests/contrib/sensors/test_sagemaker_tuning_sensor.py
         
   
   
   
   ### Commits
   - [X] My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)":
       1. Subject is separated from body by a blank line
       2. Subject is limited to 50 characters
       3. Subject does not end with a period
       4. Subject uses the imperative mood ("add", not "adding")
       5. Body wraps at 72 characters
       6. Body explains "what" and "why", not "how"
   
   
   ### Documentation
   - [X] In case of new functionality, my PR adds documentation that describes how to use it.
       - When adding new operators/hooks/sensors, the autoclass documentation generation needs to be added.
   
   
   ### Code Quality
   - [X] Passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
   

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