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State of the art Lexical Substitution in Context

Project description


pip3 install lexsub


The Lexical Substitution task involves selecting and ranking lexical paraphrases for a target word in a given sentential context. In the task, annotators and systems find an alternative substitute word or phrase for a target word in context. The task involves both finding the synonyms and disambiguating the context. To give an example:

Context: The wine was too strong to drink.
Target Word: strong

Predicted Candidates (Ranked): 

Powerful and potent are much better replacements as indicated by the score next to them as well. Whereas, all are viable replacement candidates given the context from a language modeling perspective.
Now notice two important things that is interesting:

  • Not all synonyms fit in the context.
    (direct lexical substitutions aka synonyms won’t always work)
  • Not all words that fit in the context preserve the meaning of the sentence. (LM score doesn’t always correlate)


A. Lexical Substitution:

B. Word Sense Disambiguation:


  2. Pre-BERT-SOTA,Melamud
  3. PIC- Katrin
  4. SemBERT, AAAI 2020
  6. Morgifier LSTM, ICLR 2020

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