Scope class for bfloat16 variables so that the model uses custom getter.
@tf_contextlib.contextmanager tf.tpu.bfloat16_scope()
This enables variables to be read as bfloat16 type when using get_variable.
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Code samples licensed under the Apache 2.0 License.
https://www.tensorflow.org/versions/r1.15/api_docs/python/tf/tpu/bfloat16_scope