s3PipeDataset example

**What did you find confusing? Please describe.**
I have been trying to start a Sagemaker job with s3pipedataset using TensorFlow or PyTorch but so far I have not been successful. Also, I think pipe mode doesn't work locally.

Is there some documentation or a notebook for end-to-end training using s3pipedataset?

Or at least provide some datasets already stored in PipeDatasetFormat that can be directly loaded into a TensorFlow or PyTorch model.

If possible can you guys also share some Image Dataset for the Computer Vision example?

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**Describe how documentation can be improved**
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**Additional context**
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No files, tests, or entry points are named. Review the existing SageMaker TensorFlow extensions documentation and examples first, then narrow the request to one end-to-end s3pipedataset workflow; completion would require a documented, reproducible TensorFlow or PyTorch example with a stated dataset and expected training result.

Written by the indexing model from the issue text.