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3c1f97c3 - SageMaker enhancements to allow custom docker image, input channels referring to s3/remote data locations and metrics logging (#504)

SageMaker enhancements to allow custom docker image, input channels referring to s3/remote data locations and metrics logging (#504) * SageMaker DP and MP Support * fix 😅 * removing SageMaker MP option * adding support for custom image_uri, data location and metrics