Commit d854706b authored by Jingyue Wu's avatar Jingyue Wu Committed by TensorFlower Gardener
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Collapse adjacent dimensions that have no paddings. 

For example,

tf.pad(<4D tensor>, [[0, 0], [0, 0], [0, 0], [0, 1]])

is equivalent to a 2D pad, which is faster.

PiperOrigin-RevId: 189926996
parent 911225a7
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