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What BERT Is Not:Lessons from a New Suite of Psycholinguistic Diagnostics for Language Models - 2020

Research Area:  Machine Learning

Abstract:

Pre-training by language modeling has become a popular and successful approach to NLP tasks, but we have yet to understand exactly what linguistic capacities these pre-training processes confer upon models. In this paper we introduce a suite of diagnostics drawn from human language experiments, which allow us to ask targeted questions about information used by language models for generating predictions in context. As a case study, we apply these diagnostics to the popular BERT model, finding that it can generally distinguish good from bad completions involving shared category or role reversal, albeit with less sensitivity than humans, and it robustly retrieves noun hypernyms, but it struggles with challenging inference and role-based event prediction— and, in particular, it shows clear insensitivity to the contextual impacts of negation.

Author(s) Name:  Allyson Ettinger

Journal name:  Transactions of the Association for Computational Linguistics

Conferrence name:  

Publisher name:  MIT Press

DOI:  10.1162/tacl_a_00298

Volume Information:   (2020), Volume 8, Pages: 34–48.