Commit 18718b6f authored by Benoit Steiner's avatar Benoit Steiner Committed by TensorFlower Gardener
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Misc grappler improvements: 

 * Avoid copying optimized graphs since that takes time.
 * Avoid optimizing a pruned graph, since it's already been pruned there isn't much to gain

PiperOrigin-RevId: 163842122
parent 90abbf68
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