Commit f448189d authored by A. Unique TensorFlower's avatar A. Unique TensorFlower Committed by TensorFlower Gardener
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Make sure the same rewrite is not performed multiple times in... 

Make sure the same rewrite is not performed multiple times in ArithmeticOptimizer, and that added nodes are unique.
A couple of minor cleanups.

PiperOrigin-RevId: 182609552
parent 677d733e
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