Commit 17bf2b33 authored by Russell Power's avatar Russell Power Committed by TensorFlower Gardener
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Graph construction: skip testing for duplicate edges during source/sink setup. 

When fixing up source/sink edges, we are only adding missing edges.  Skip the
test for duplicate edges in this case, which avoids a linear traversal over
sink edges.

PiperOrigin-RevId: 227940303
parent 774ede57
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