tgt/src ratio based beam stopping condition #1344
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Based on this paper http://aclweb.org/anthology/D18-1342
this PR replaces #1336 which was done on an old codebase.
Usage:
translate.py -length_penalty avg -ratio 1.1
where 1.1 is the predicted ratio tgt_len / src_len
I tested it on a few engines, it brings some improvements.