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Issue No. 11 - November (2009 vol. 31)
ISSN: 0162-8828
pp: 2083-2087
Robert W.P. Luk , The Hong Kong Polytechnic University, Hong Kong
Edward K.F. Dang , The Hong Kong Polytechnic University, Hong Kong
D.L. Lee , Hong Kong University of Science and Technology, Hong Kong
K.S. Ho , The Hong Kong Polytechnic University, Hong Kong
Stephen C.F. Chan , The Hong Kong Polytechnic University, Hong Kong
ABSTRACT
Given a set of clusters, we consider an optimization problem which seeks a subset of clusters that maximizes the microaverage F-measure. This optimal value can be used as an evaluation measure of the goodness of clustering. For arbitrarily overlapping clusters, finding the optimal value is NP-hard. We claim that a greedy approximation algorithm yields the global optimal solution for clusters that overlap only by nesting. We present a mathematical proof of this claim by induction. For a family of n clusters containing a total of N objects, this algorithm has an {\rm O}(n^{2}) time complexity and O(N) space complexity.
INDEX TERMS
Clustering, classification, performance evaluation, optimization.
CITATION
Robert W.P. Luk, Edward K.F. Dang, D.L. Lee, K.S. Ho, Stephen C.F. Chan, "Optimal Combination of Nested Clusters by a Greedy Approximation Algorithm", IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 31, no. , pp. 2083-2087, November 2009, doi:10.1109/TPAMI.2009.75
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