Commit eab53f2c authored by Justin Lebar's avatar Justin Lebar Committed by TensorFlower Gardener
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[XLA:GPU] Implement trivial (one-replica) cross-replica-sum on XLA:GPU. 

Also fix the CPU implementation to work in the case when there are
multiple operands to the cross-replica-sum op.

PiperOrigin-RevId: 197506311
parent c0bf28ec
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