tf.graph_util.must_run_on_cpu

Returns True if the given node_def must run on CPU, otherwise False. (deprecated)

Args
node The node to be assigned to a device. Could be either an ops.Operation or NodeDef.
pin_variables_on_cpu If True, this function will return False if node_def represents a variable-related op.
Returns
True if the given node must run on CPU, otherwise False.

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Code samples licensed under the Apache 2.0 License.
https://www.tensorflow.org/versions/r1.15/api_docs/python/tf/graph_util/must_run_on_cpu