Using NLTK Bleu Module http://www.nltk.org/_modules/nltk/align/bleu.html http://www.nltk.org/_modules/nltk/translate/bleu_score.html
Word Error Rate https://en.wikipedia.org/wiki/Word_error_rate Translation error Rate http://www.cs.umd.edu/~snover/tercom/ Meteor Score http://www.cs.cmu.edu/~alavie/METEOR/