Commit e0e4f693 authored by Eugene Brevdo's avatar Eugene Brevdo Committed by TensorFlower Gardener
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[tf.contrib.seq2seq] Reserve -1s in GatherTree for error states. 

GatherTree now emits end_token after the first decoded end_token in the path,
instead of -1s at the end of each sequence.

PiperOrigin-RevId: 172816652
parent f2250bfe
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