Checklist

• I've tested that my changes are compatible with the latest version of Tensorflow.
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.

Motivation and Context

Description

Hi,

To correct the Python format automatically, run:
yapf -i xxx.py or yapf -i --recursive folder

Also, please put your name and PR ID in changelog.md, it will be listed in the next release.

Hi,
I've cleaned the code and changed the log.

Thanks

Let me know, when it is ready to be merged, but it seem that some conflicts must be solved before merging.