tailieunhanh - Báo cáo khoa học: "Improving Summaries by Revising Them"

This paper describes a program which revises a draft text by aggregating together descriptions of discourse entities, in addition to deleting extraneous information. In contrast to knowledgerich sentence aggregation approaches explored in the past, this approach exploits statistical parsing and robust coreference detection. In an evaluation involving revision of topic-related summaries using informativeness measures from the T I P S T E R SUMMAC evaluation, the results show gains in informativeness without compromising readability. . | Improving Summaries by Revising Them Inderjeet Mani and Barbara Gates and Eric Bloedorn The MITRE Corporation 11493 Sunset Hills Rd. Reston VA 22090 USA imani bigates bloedorn Abstract This paper describes a program which revises a draft text by aggregating together descriptions of discourse entities in addition to deleting extraneous information. In contrast to knowledgerich sentence aggregation approaches explored in the past this approach exploits statistical parsing and robust coreference detection. In an evaluation involving revision of topic-related summaries using informativeness measures from the TIPSTER SUMMAC evaluation the results show gains in informativeness without compromising readability. 1 Introduction Writing improves with revision. Authors are familiar with the process of condensing a long paper into a shorter one this is an iterative process with the results improved over successive drafts. Professional abstractors carry out substantial revision and editing of abstracts Crem-mins 1996 . We therefore expect revision to be useful in automatic text summarization. Prior research exploring the use of revision in summarization . Gabriel 1988 Robin 1994 McKeown et al. 1995 has focused mainly on structured data as the input. Here we examine the use of revision in summarization of text input. First we review some summarization terminology. In revising draft summaries these condensation operations as well as stylistic rewording of sentences play an important role. Summaries can be used to indicate what topics are addressed in the source text and thus can be used to alert the user as to the source content the indicative function . Summaries can also be used to cover the concepts in the source text to the extent possible given the compression requirements for the summary the infor mative function . Summaries can be tailored to a reader s interests and expertise yielding topic-related summaries or they can be aimed at a particular - usually .