Implicit Entity Linking in Tweets

TL;DR

This paper introduces the task of implicit entity linking in tweets, emphasizing the importance of linking entities mentioned indirectly and proposing models that leverage factual and contextual knowledge to improve linking accuracy.

Contribution

It presents the first approach to implicit entity linking in tweets, exploiting contextual knowledge, and provides a publicly available dataset for future research.

Findings

Implicit entity linking adds value to standard entity linking.

Contextual knowledge significantly improves linking accuracy.

Ground truth dataset of 397 tweets is made publicly available.

Abstract

Over the years, Twitter has become one of the largest communication platforms providing key data to various applications such as brand monitoring, trend detection, among others. Entity linking is one of the major tasks in natural language understanding from tweets and it associates entity mentions in text to corresponding entries in knowledge bases in order to provide unambiguous interpretation and additional con- text. State-of-the-art techniques have focused on linking explicitly mentioned entities in tweets with reasonable success. However, we argue that in addition to explicit mentions i.e. The movie Gravity was more ex- pensive than the mars orbiter mission entities (movie Gravity) can also be mentioned implicitly i.e. This new space movie is crazy. you must watch it!. This paper introduces the problem of implicit entity linking in tweets. We propose an approach that models the entities by exploiting their factual and contextual knowledge. We demonstrate how to use these models to perform implicit entity linking on a ground truth dataset with 397 tweets from two domains, namely, Movie and Book. Specifically, we show: 1) the importance of linking implicit entities and its value addition to the standard entity linking task, and 2) the importance of exploiting contextual knowledge associated with an entity for linking their implicit mentions. We also make the ground truth dataset publicly available to foster the research in this new research area.