* update config

* re-blacken python code

* temporarily disable date and diff_py_file

* skip a format

* use yapf to format all python file

* yapf exclude two unittests file for they rely on writing and reading file, and format will break them

* disable diff_py_file because too many diff files cause command following failed

* amp list updated

* tests updated

* gray list updated

* amp list updated

* test updated

* Add casting initializers for bf16 training

* Changes after review

* Correct test and add comment