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Changhan Wang authored
Summary: Code for our NeurIPS paper [Levenshtein Transformer](https://arxiv.org/abs/1905.11006) * Added Levenshtein Transformer model, task and criterion class * Added iterative NAT Transformer, insertion Transformer and CMLM Transformer model class for baselines * Add an option for prepending BOS to dictionary class and translation task class Reviewed By: myleott Differential Revision: D17297372 fbshipit-source-id: 54eca60831ae95dc721c2c34e882e1810ee575c7
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