from Part II - Reference
Published online by Cambridge University Press: 05 July 2014
Introduction
A key task of almost any natural language generation (NLG) system is to refer to entities. Linguists and philosophers have a long tradition of theorizing about reference. In the words of the philosopher John Searle,
Any expression which serves to identify any thing, process, event, action, or any other kind of individual or particular I shall call a referring expression. Referring expressions point to particular things; they answer the questions Who?, What?, Which?
(Searle, 1969)Referring expression generation (REG, sometimes GRE) is the task of producing a (logical or natural language) description of a referent that allows the reader to identify it. In producing a referring expression, an NLG system can make use of any information that it can safely assume the hearer to possess, based on a model of the world and of the hearer's knowledge about the world (the knowledge base(KB)). Given a REG algorithm and a KB, the following questions can be asked:
How many entities is the algorithm able to identify? We will call this the expressive power of an algorithm. Loosely speaking, the more entities the algorithm is able to single out, the greater its expressive power.
How empirically adequate are the referring expressions generated by the algorithm? For example, how human-like are they – to what extent do they resemble the human-produced referring expressions in a corpus? How effective are they – to what extent do they enable a human recipient to identify the referent easily, quickly, and reliably?
To save this book to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.