Always Keep your Target in Mind: Studying Semantics and Improving Performance of Neural Lexical Substitution

• URL: http://arxiv.org/abs/2206.11815v1
• Date: Tue, 7 Jun 2022 16:16:19 GMT
• Title: Always Keep your Target in Mind: Studying Semantics and Improving Performance of Neural Lexical Substitution
• Authors: Nikolay Arefyev, Boris Sheludko, Alexander Podolskiy, Alexander Panchenko
• Abstract summary: We present a large-scale comparative study of lexical substitution methods employing both old and most recent language models. We show that already competitive results achieved by SOTA LMs/MLMs can be further substantially improved if information about the target word is injected properly.
• Score: 124.99894592871385
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Lexical substitution, i.e. generation of plausible words that can replace a particular target word in a given context, is an extremely powerful technology that can be used as a backbone of various NLP applications, including word sense induction and disambiguation, lexical relation extraction, data augmentation, etc. In this paper, we present a large-scale comparative study of lexical substitution methods employing both rather old and most recent language and masked language models (LMs and MLMs), such as context2vec, ELMo, BERT, RoBERTa, XLNet. We show that already competitive results achieved by SOTA LMs/MLMs can be further substantially improved if information about the target word is injected properly. Several existing and new target word injection methods are compared for each LM/MLM using both intrinsic evaluation on lexical substitution datasets and extrinsic evaluation on word sense induction (WSI) datasets. On two WSI datasets we obtain new SOTA results. Besides, we analyze the types of semantic relations between target words and their substitutes generated by different models or given by annotators.

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