19th century engraving of the Rosetta Stone (Public Domain)

NLP Metrics Made Simple: The BLEU Score

Natural language processing (NLP) has become a super-hot topic. One of the most successful applications of NLP is Machine Translation (MT) — the ability to automatically translate text from one language to another. Perhaps the most well-known MT application is the very useful Google Translate, with its ability to translate from and to 100+ languages.