Sample usage for bleu¶
>>> from nltk.translate import bleu
If the candidate has no alignment to any of the references, the BLEU score is 0.
>>> bleu( ... ['The candidate has no alignment to any of the references'.split()], ... 'John loves Mary'.split(), ... (1,), ... ) 0
This is an implementation of the smoothing techniques for segment-level BLEU scores that was presented in Boxing Chen and Collin Cherry (2014) A Systematic Comparison of Smoothing Techniques for Sentence-Level BLEU. In WMT14. http://acl2014.org/acl2014/W14-33/pdf/W14-3346.pdf >>> from nltk.translate.bleu_score import sentence_bleu,SmoothingFunction
>>> sentence_bleu( ... ['It is a place of quiet contemplation .'.split()], ... 'It is .'.split(), ... smoothing_function=SmoothingFunction().method4, ... )*100 4.4267...