Google Research

DOCENT: Learning Self-Supervised Entity Representations from Large Document Collections

Proceedings of EACL (2021) (to appear)

Abstract

This paper explores learning rich self-supervised entity representations from large amounts of associated text. Once pre-trained, these models become applicable to multiple entity-centric tasks such as search ranked retrieval, knowledge base completion, question answering and more. Unlike other methods that harvest self-supervision signals based merely on a local context within a sentence, we radically expand the notion of context to include {\em any} available text related to an entity. With the breadth and depth of textual content available on the web, this approach enables a new class of powerful, high-capacity representations that can ultimately ``remember" any useful information about an entity, without the need for human annotations.

We present several training strategies that jointly learn to predict words and entities --- strategies we compare experimentally on downstream tasks in the TV-Movies domain, such as MovieLens tag prediction from user reviews and natural language movie search. As evidenced by results, our models outperform competitive baselines, sometimes with little or no fine-tuning, and are also able to scale to very large corpora.

Finally, we make our datasets and pre-trained models publicly available\footnote{To be released after the review period.}. This includes {\em Reviews2Movielens}, mapping the 1B word corpus of Amazon movie reviews to MovieLens tags, as well as Reddit Movie Suggestions containing natural language queries and corresponding community recommendations.

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