Title

Blocking Reduction Strategies in Hierarchical Text Classification

Publication Type

Journal Article

Publication Date

10-2004

Abstract

One common approach in hierarchical text classification involves associating classifiers with nodes in the category tree and classifying text documents in a top-down manner. Classification methods using this top-down approach can scale well and cope with changes to the category trees. However, all these methods suffer from blocking which refers to documents wrongly rejected by the classifiers at higher-levels and cannot be passed to the classifiers at lower-levels. We propose a classifier-centric performance measure known as blocking factor to determine the extent of the blocking. Three methods are proposed to address the blocking problem, namely, threshold reduction, restricted voting, and extended multiplicative. Our experiments using support vector machine (SVM) classifiers on the Reuters collection have shown that they all could reduce blocking and improve the classification accuracy. Our experiments have also shown that the Restricted Voting method delivered the best performance.

Discipline

Databases and Information Systems | Numerical Analysis and Scientific Computing

Research Areas

Data Management and Analytics

Publication

IEEE Transactions on Knowledge and Data Engineering

Volume

16

Issue

10

First Page

1305

Last Page

1308

ISSN

1041-4347

Identifier

10.1109/TKDE.2004.50

Publisher

IEEE

Additional URL

http://dx.doi.org/10.1109/TKDE.2004.50