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BLEU

Out-of-the-box Python script for sentence level and corpus level BLEU calculation We recommend users to use nltk-based BLEU calculation script by installing nltk first.

Run python bleu.py -h or python nltk_bleu.py -h to see the help information

Usage

python bleu.py -h to see the help information

  1. input FILES

    • python bleu.py -t translation.file -t reference.file
    • Set the parameter --sentence-level and other related parameters, such as --smooth-epsilon, --smooth to print sentence-level BLEU score.

  2. input Strings

    python bleu.py -t "test bleu calculation" -r "test blue calculation"
    
    BLEU = 90.36,  66.7/0.0/0.0/0.0 (BP=1.0,  ratio=1.0,  hyp_len=3,  ref_len=3)

The bleu.py is updated from this gist.

nltk-based

Instead of using bleu.py, one can use nltk_bleu.py based on nltk.

for example: python nltk_bleu.py -r reference.file -t translation.file

Similarly, one can use --sentence-level or -sl to print sentence-level BLEU score.

TODO

  1. bleu.py correctness check
  2. better wrapper for nltk_bleu.py
  3. NLTK installation included?