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Jiatao Gu authored
Summary: Implementation of Levenshtein Transformer paper. Add a new helper function "new_arange" to create arange tensor easily. Fix bugs of returning attn values for NAT models Delete files which are not necessary or experimental. Reviewed By: kahne Differential Revision: D17652009 fbshipit-source-id: 436bbb5d45de2f8067003232de4f2bd51e87719c
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