eBook Unsupervised Information Extraction by Text Segmentation, 1st Edition

  • Published By:
  • ISBN-10: 331902597X
  • ISBN-13: 9783319025971
  • DDC: 005.74
  • Grade Level Range: College Freshman - College Senior
  • 94 Pages | eBook
  • Original Copyright 2013 | Published/Released April 2014
  • This publication's content originally published in print form: 2013
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About

Overview

A new unsupervised approach to the problem of Information Extraction by Text Segmentation (IETS) is proposed, implemented and evaluated herein. The authors’ approach relies on information available on pre-existing data to learn how to associate segments in the input string with attributes of a given domain relying on a very effective set of content-based features. The effectiveness of the content-based features is also exploited to directly learn from test data structure-based features, with no previous human-driven training, a feature unique to the presented approach. Based on the approach, a number of results are produced to address the IETS problem in an unsupervised fashion. In particular, the authors develop, implement and evaluate distinct IETS methods, namely ONDUX, JUDIE and iForm.ONDUX (On Demand Unsupervised Information Extraction) is an unsupervised probabilistic approach for IETS that relies on content-based features to bootstrap the learning of structure-based features. JUDIE (Joint Unsupervised Structure Discovery and Information Extraction) aims at automatically extracting several semi-structured data records in the form of continuous text and having no explicit delimiters between them. In comparison with other IETS methods, including ONDUX, JUDIE faces a task considerably harder that is, extracting information while simultaneously uncovering the underlying structure of the implicit records containing it. iForm applies the authors’ approach to the task of Web form filling. It aims at extracting segments from a data-rich text given as input and associating these segments with fields from a target Web form.All of these methods were evaluated considering different experimental datasets, which are used to perform a large set of experiments in order to validate the presented approach and methods.

Table of Contents

Front Cover.
Other Frontmatter.
Title Page.
Copyright Page.
Dedication Page.
Foreword.
Preface.
Contents.
Introduction.
1: Related Work.
2: Exploiting Pre-Existing Datasets to Support IETS.
3: ONDUX.
4: JUDIE.
5: iForm.
6: Conclusions and Future Work.