Make the input_fn return the dataset directly.
Make the input_fn return the dataset directly.

PiperOrigin-RevId: 189060074

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