Summary: On Strategies for Imbalanced Text Classification Using SVM:
A Comparative Study
School of Computer Engineering, Nanyang Technological University, Singapore
School of Information Systems, Singapore Management University, Singapore
Department of Industrial and Systems Engineering, Hong Kong Polytechnic University, Hong Kong
Many real-world text classification tasks involve imbalanced training examples. The
strategies proposed to address the imbalanced classification (e.g., resampling, instance
weighting), however, have not been systematically evaluated in the text domain. In
this paper, we conduct a comparative study on the effectiveness of these strategies in the
context of imbalanced text classification using Support Vector Machines (SVM) classifier.
SVM is the interest in this study for its good classification accuracy reported in many
text classification tasks. We propose a taxonomy to organize all proposed strategies
following the training and the test phases in text classification tasks. Based on the
taxonomy, we survey the methods proposed to address the imbalanced classification.
Among them, 10 commonly-used methods were evaluated in our experiments on three
benchmark datasets, i.e., Reuters-21578, 20-Newsgroups, and WebKB. Using the area