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Active Learning Approaches for Labeling Text: Review and Assessment of the Performance of Active Learning Approaches

Published online by Cambridge University Press:  21 April 2020

Blake Miller Open the ORCID record for Blake Miller [Opens in a new window] ,
Fridolin Linder  and
Walter R. Mebane Jr.
Blake Miller*
Affiliation:
Department of Methodology, London School of Economics and Political Science, Columbia House, Houghton Street, London WC2A 2AE, UK. Email: b.a.miller@lse.ac.uk
Fridolin Linder
Affiliation:
Department of Political Science, Social Media and Political Participation Lab, New York University, 431 19 West 4th Street, New York, NY 10012, USA. Email: fridolin.linder@nyu.edu
Walter R. Mebane Jr.
Affiliation:
Professor, Department of Political Science and Department of Statistics, University of Michigan, Haven Hall, Ann Arbor, MI 48109-1045, USA. Email: wmebane@umich.edu
*
* Email: b.a.miller@lse.ac.uk
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Abstract

Supervised machine learning methods are increasingly employed in political science. Such models require costly manual labeling of documents. In this paper, we introduce active learning, a framework in which data to be labeled by human coders are not chosen at random but rather targeted in such a way that the required amount of data to train a machine learning model can be minimized. We study the benefits of active learning using text data examples. We perform simulation studies that illustrate conditions where active learning can reduce the cost of labeling text data. We perform these simulations on three corpora that vary in size, document length, and domain. We find that in cases where the document class of interest is not balanced, researchers can label a fraction of the documents one would need using random sampling (or “passive” learning) to achieve equally performing classifiers. We further investigate how varying levels of intercoder reliability affect the active learning procedures and find that even with low reliability, active learning performs more efficiently than does random sampling.

Keywords

active learningstatistical analysis of textssupervised learningintercoder reliability

Information

Type
Articles
Information
Political Analysis , Volume 28 , Issue 4 , October 2020 , pp. 532 - 551
Copyright
Copyright © The Author(s) 2020. Published by Cambridge University Press on behalf of the Society for Political Methodology.

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Footnotes

Contributing Editor: Jeff Gill

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