Surrogate Learning - An Approach for Semi-Supervised Classification

Details Surrogate Learning - An Approach for Semi-Supervised Classification Surrogate Learning - An Approach for Semi-Supervised Classification

2008-09-26

arxiv.org/abs/0809.4632v1

Computer Science

Learning

8 pages, 2 figures

Scientific paper

We consider the task of learning a classifier from the feature space $\mathcal{X}$ to the set of classes $\mathcal{Y} = \{0, 1\}$, when the features can be partitioned into class-conditionally independent feature sets $\mathcal{X}_1$ and $\mathcal{X}_2$. We show the surprising fact that the class-conditional independence can be used to represent the original learning task in terms of 1) learning a classifier from $\mathcal{X}_2$ to $\mathcal{X}_1$ and 2) learning the class-conditional distribution of the feature set $\mathcal{X}_1$. This fact can be exploited for semi-supervised learning because the former task can be accomplished purely from unlabeled samples. We present experimental evaluation of the idea in two real world applications.

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