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arxiv 2002.12327 v3 pith:ERYKYOBX submitted 2020-02-27 cs.CL

A Primer in BERTology: What we know about how BERT works

classification cs.CL
keywords bertwhatstateworksapproachesarchitectureareasbehind
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Transformer-based models have pushed state of the art in many areas of NLP, but our understanding of what is behind their success is still limited. This paper is the first survey of over 150 studies of the popular BERT model. We review the current state of knowledge about how BERT works, what kind of information it learns and how it is represented, common modifications to its training objectives and architecture, the overparameterization issue and approaches to compression. We then outline directions for future research.

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