“e983cc90fcee4e5b73bce9d4853b85aac4661e3a”上不存在“python/paddle/v2/fluid/tests/unittests/test_matmul_op.py”
* 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