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A Branch and Bound Algorithm for Feature Subset Selection

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2 Author(s)
Narendra, Patrenahalli M. ; Honeywell Systems and Research Center ; Fukunaga, K.

A feature subset selection algorithm based on branch and bound techniques is developed to select the best subset of m features from an n-feature set. Existing procedures for feature subset selection, such as sequential selection and dynamic programming, do not guarantee optimality of the selected feature subset. Exhaustive search, on the other hand, is generally computationally unfeasible. The present algorithm is very efficient and it selects the best subset without exhaustive search. Computational aspects of the algorithm are discussed. Results of several experiments demonstrate the very substantial computational savings realized. For example, the best 12-feature set from a 24-feature set was selected with the computational effort of evaluating only 6000 subsets. Exhaustive search would require the evaluation of 2 704 156 subsets.

Published in:

Computers, IEEE Transactions on  (Volume:C-26 ,  Issue: 9 )

Date of Publication:

Sept. 1977

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