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tf.nest.is_nested

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Returns true if its input is a collections.abc.Sequence (except strings).

Args
seq an input sequence.
Returns
True if the sequence is a not a string and is a collections.abc.Sequence or a dict.

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