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inflected words and adjectives in other languages.
This code to see if a token has a corresponding AFINN label:
if (!labels.hasOwnProperty(obj)) continue;
in many non English language does not work for inflected words.
In English you say: "the cat is stupid" and "the cats are stupid" (btw cats are smart! :D )
In French you say: "le chat est stupide" and "les chats sont stupides". The stemmed word "stupid" is flected into stupide and stupides.
if we use "stupid" in the labels, the scoring is never done. Using all the possible inflected words is tedious and long.
may be you could change the line of code to take into account stemmed (or truncated) words?