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• W2057320839 abstract "We present a divide-and-merge methodology for clustering a set of objects that combines a top-down “divide” phase with a bottom-up “merge” phase. In contrast, previous algorithms use either top-down or bottom-up methods to construct a hierarchical clustering or produce a flat clustering using local search (e.g., k -means). For the divide phase, which produces a tree whose leaves are the elements of the set, we suggest an efficient spectral algorithm. When the data is in the form of a sparse document-term matrix, we show how to modify the algorithm so that it maintains sparsity and runs in linear space. The merge phase quickly finds the optimal partition that respects the tree for many natural objective functions, for example, k -means, min-diameter, min-sum, correlation clustering, etc. We present a thorough experimental evaluation of the methodology. We describe the implementation of a meta-search engine that uses this methodology to cluster results from web searches. We also give comparative empirical results on several real datasets." @default.
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• W2057320839 date "2006-12-01" @default.
• W2057320839 modified "2023-10-18" @default.
• W2057320839 title "A divide-and-merge methodology for clustering" @default.
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• W2057320839 doi "https://doi.org/10.1145/1189769.1189779" @default.
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