Measuring and Improving Consistency in Pretrained Language Models

Author:

Elazar Yanai12,Kassner Nora3,Ravfogel Shauli14,Ravichander Abhilasha5,Hovy Eduard6,Schütze Hinrich7,Goldberg Yoav18

Affiliation:

1. Computer Science Department, Bar Ilan University, Israel

2. Allen Institute for Artificial Intelligence, United States. yanaiela@gmail.com

3. Center for Information and Language Processing (CIS), LMU Munich, Germany. kassner@cis.lmu.de

4. Allen Institute for Artificial Intelligence, United States. shauli.ravfogel@;gmail.com

5. Language Technologies Institute, Carnegie Mellon University, United States. aravicha@cs.cmu.edu

6. Language Technologies Institute, Carnegie Mellon University, United States. hovy@cs.cmu.edu

7. Center for Information and Language Processing (CIS), LMU Munich, Germany

8. Allen Institute for Artificial Intelligence, United States. yoav.goldberg@gmail.com

Abstract

Abstract Consistency of a model—that is, the invariance of its behavior under meaning-preserving alternations in its input—is a highly desirable property in natural language processing. In this paper we study the question: Are Pretrained Language Models (PLMs) consistent with respect to factual knowledge? To this end, we create ParaRel🤘, a high-quality resource of cloze-style query English paraphrases. It contains a total of 328 paraphrases for 38 relations. Using ParaRel🤘, we show that the consistency of all PLMs we experiment with is poor— though with high variance between relations. Our analysis of the representational spaces of PLMs suggests that they have a poor structure and are currently not suitable for representing knowledge robustly. Finally, we propose a method for improving model consistency and experimentally demonstrate its effectiveness.1

Publisher

MIT Press - Journals

Subject

Artificial Intelligence,Computer Science Applications,Linguistics and Language,Human-Computer Interaction,Communication

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