Add Keras ResNet model tests in legacy graph mode (#6444)
Add Keras ResNet model tests in legacy graph mode (#6444)


derekjchow/models,alexgorban/models,tombstone/models,alexgorban/models,alexgorban/models,derekjchow/models,derekjchow/models,tombstone/models,derekjchow/models,alexgorban/models,alexgorban/models,tombstone/models,tombstone/models,derekjchow/models,tombstone/models,tombstone/models