text: 
  
  TITLE
  MMI-antiLM decoding
  
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  # What does this PR do?
  
  Implements **Maximum Mutual Information anti-Language Model objective (MMI anti-LM)** decoding from [A Diversity-Promoting Objective Function for Neural Conversation Models](https://www.aclweb.org/anthology/N16-1014.pdf). 
  