Abstract:

This paper analyzes and summarizes the previous definition of feature selection,and then introduces a self-contained definition. It divides feature se lection into three classes according to the selecting strategy, and categorizes the methods into five styles by the evaluation function. Through analyzi ng the infection factors in the feature selection technology,this paper introduces some principles to pave the way for practitioners who search for suit able features to solve real-world applications.

Key words: （feature selection, recognition, feature evaluation）