Context manager to check for C API status.
__enter__
__enter__()
__exit__
__exit__( type_arg, value_arg, traceback_arg )
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Licensed under the Creative Commons Attribution License 3.0.
Code samples licensed under the Apache 2.0 License.
https://www.tensorflow.org/versions/r1.15/api_docs/python/tf/errors/raise_exception_on_not_ok_status