Scott Zhu 94941b0f9a Fork and update the API compatibility test for OSS keras.
Borrow the main body of the tf api compat test for diffing and api generation. The py_object_to_proto lib need a slight update to config the root path since we will make tensorflow.keras as the root when visiting all the keras related API.

PiperOrigin-RevId: 360954528
Change-Id: I1c0d6e3310479cc7cf66ffd1f8b1a060f7f5029b
2021-03-04 10:59:39 -08:00
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