UAlberta at LSCDiscovery: Lexical Semantic Change Detection via Word Sense Disambiguation

Abstract

We describe our two systems for the shared task on Lexical Semantic Change Discovery in Spanish. For binary change detection, we frame the task as a word sense disambiguation (WSD) problem. We derive sense frequency distributions for target words in both old and modern corpora. We assume that the word semantics have changed if a sense is observed in only one of the two corpora, or the relative change for any sense exceeds a tuned threshold. For graded change discovery, we follow the design of CIRCE (Pömsl and Lyapin, 2020) by combining both static and contextual embeddings. For contextual embeddings, we use XLM-RoBERTa instead of BERT, and train the model to predict a masked token instead of the time period. Our language-independent methods achieve results that are close to the bestperforming systems in the shared task.

LSCDiscovery: A shared task on semantic change discovery and detection in Spanish

“…UAlberta (Teodorescu et al, 2022) This team applied different methods to the two subtasks. For Graded Change Discovery, they followed the design of CIRCE (Pömsl and Lyapin, 2020) and computed distances based on both static (typebased) and contextual (token-based) embeddings, with their relative weights tuned on the development set.…”