Contextualized embeddings for lexical semantics

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• Katrin Erk, University of Texas at Austin
• Thursday 12 May 2022, 15:00-16:00
• https://cam-ac-uk.zoom.us/j/97599459216?pwd=QTRsOWZCOXRTREVnbTJBdXVpOXFvdz09.

If you have a question about this talk, please contact Marinela Parovic.

Word embeddings are dense vector representations computed automatically from large amounts of text. From a lexical semantics perspective, we can view an embedding as a compact aggregate of many observed word uses, from different speakers. Especially contextualized word embeddings are highly interesting for lexical semantics because they give us a potential window into garden-variety polysemy: polysemy that is entirely idiosyncratic, not regular. But there is not yet a standardized way to use contextualized embeddings for lexical semantics. I report on two studies we have been doing. In the first, we tested the use of word token clusters on the task of type-level similarity. In the second, we are mapping word token embeddings to human-readable features. I also comment on a trend in word embeddings, from count-based embeddings to the most recent contextualized embeddings, to pick up on what could be called traces of stories: text topics, judgments and sentiment, and cultural trends. I argue that this is actually an interesting signal and not a bug.

This talk is part of the Language Technology Lab Seminars series.

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