Commit bd32edac authored by Derek Murray's avatar Derek Murray Committed by TensorFlower Gardener
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[tf.data] Cache dataset structure properties in `ConcatenateDataset`. 

Previously, these would be recomputed from the input on each call to
`ConcatenateDataset.output_shapes`, which would lead to pathological
behavior when building a long chain of `Dataset.concatenate()`
transformations.

PiperOrigin-RevId: 219217408
parent fdfbaa88
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