Semi-Supervised Learning of Mixture Models

Fabio Gagliardi Cozman, Ira Cohen, and Marcelo Cesar Cirelo

This paper analyzes the performance of semisupervised learning of mixture models. We show that unlabeled data can lead to an increase in classification error even in situations where additional labeled data would decrease classification error. We present a mathematical analysis of this "degradation" phenomenon and show that it is due to the fact that bias may be adversely affected by unlabeled data. We discuss the impact of these theoretical results to practical situations.


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