* [OpAttr]Adapt tensor axis for reduce_min/max/mean/sum/prod

* 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

* 1. add the python api grad 2. add final and intermediate state vlog 3. change the python_api error logic

* add python api or close the check_eager=True

* fix the compatibility

* Fix wrong out dtype from helper.input_dtype

* add unittest

* remove disable_static in op_test

* fix param name typo

* Rename `Input` into `InputSpec`

* fix argument place of Input api

Update the code for the min,max, test=develop

* Add the max, min, maximum, minimum api for the API 2.0, test=develop