A comparative evaluation and analysis of three generations of Distributional Semantic ModelsShow others and affiliations
2022 (English)In: Language resources and evaluation, ISSN 1574-020X, E-ISSN 1574-0218, Vol. 56, p. 1219-Article in journal (Refereed) Published
Abstract [en]
Distributional semantics has deeply changed in the last decades. First, predict models stole the thunder from traditional count ones, and more recently both of them were replaced in many NLP applications by contextualized vectors produced by neural language models. Although an extensive body of research has been devoted to Distributional Semantic Model (DSM) evaluation, we still lack a thorough comparison with respect to tested models, semantic tasks, and benchmark datasets. Moreover, previous work has mostly focused on task-driven evaluation, instead of exploring the differences between the way models represent the lexical semantic space. In this paper, we perform a large-scale evaluation of type distributional vectors, either produced by static DSMs or obtained by averaging the contextualized vectors generated by BERT. First of all, we investigate the performance of embeddings in several semantic tasks, carrying out an in-depth statistical analysis to identify the major factors influencing the behavior of DSMs. The results show that (i) the alleged superiority of predict based models is more apparent than real, and surely not ubiquitous and (ii) static DSMs surpass BERT representations in most out-of-context semantic tasks and datasets. Furthermore, we borrow from cognitive neuroscience the methodology of Representational Similarity Analysis (RSA) to inspect the semantic spaces generated by distributional models. RSA reveals important differences related to the frequency and part-of-speech of lexical items. © 2022, The Author(s).
Place, publisher, year, edition, pages
Springer Science and Business Media B.V. , 2022. Vol. 56, p. 1219-
Keywords [en]
Contextual embeddings, Distributional semantics, Evaluation, Representational Similarity Analysis
National Category
Language Technology (Computational Linguistics)
Identifiers
URN: urn:nbn:se:ri:diva-58900DOI: 10.1007/s10579-021-09575-zScopus ID: 2-s2.0-85125439429OAI: oai:DiVA.org:ri-58900DiVA, id: diva2:1647234
2022-03-252022-03-252023-07-07Bibliographically approved