[pull] master from tensorflow:master#351
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pull[bot] merged 1 commit intoMu-L:masterfrom Sep 13, 2020
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1. Lower broadcast priority during propagation. Broadcast(scalar) often gets CSE'ed, and their users could have different sharding 2. Track the dimensions from broadcast in SPMD builder, so that we can skip reshard with collective permutes. PiperOrigin-RevId: 331379273 Change-Id: If84400716ef3bb6b73d80f27e3112e63f634bb9f
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