technical_drawings_extraction/venv/lib/python3.7/site-packages/nltk/test/bleu.doctest

==========
BLEU tests
==========

>>> 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