I was strugging to find how synonyms work in Rasa. I had assumed that there was a classifier that was trained on the synonyms examples to map to any of the defined synonyms or just use the identity mapping if the phrase is classifed as in the “other” category (using the entities that synonyms weren’t provided for as signal). I decided to take a look at the code (please let me know if there are docs on this): https://github.com/RasaHQ/rasa/blob/main/rasa/nlu/extractors/entity_synonyms.py#L145 . It looks like it’s just doing case-insensitive exact matching. Is it the case that user’s input has to exactly match a given spelling/phrasing of the synonym for it to get mapped to the synonym?

How do synonyms work? Classifier? Exact pattern matching?

ChrisRahme (Chris Rahmé) September 27, 2021, 8:04pm 2

Haven’t checked the code previously, but from experience, I can confirm that it is doing a case-insensitive exact matching.

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