Abstract
In this paper, we discuss a method for finding top-N colossal frequent patterns. A colossal pattern we try to extract is a maximal pattern with top-N largest length. Since colossal patterns can be found in relatively lower areas of an itemset (concept) lattice, an efficient method with some effective pruning mechanisms is desired.
We design a depth-first branch-and-bound algorithm for finding colossal patterns with top-N length, where a notion of pattern graph plays an important role. A pattern graph is a compact representation of the class of frequent patterns with a designated length. A colossal pattern can be found as a clique in a pattern graph satisfying a certain condition. From this observation, we design an algorithm for finding our target patterns by examining cliques in a graph defined from the pattern graph. The algorithm is based on a depth-first branch-and-bound method for finding a maximum clique. It should be noted that as our search progresses, the graph we are concerned with is dynamically updated into a sparser one which makes our task of finding cliques much easier and the branch-and-bound pruning more powerful. To the best of our knowledge, it is the first algorithm tailored for the problem which can exactly identify top-N colossal patterns. In our experimentation, we compare our algorithm with famous maximal frequent itemset miners from the viewpoint of computational efficiency for a synthetic and a benchmark dataset.
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Okubo, Y., Haraguchi, M. (2012). Finding Top-N Colossal Patterns Based on Clique Search with Dynamic Update of Graph. In: Domenach, F., Ignatov, D.I., Poelmans, J. (eds) Formal Concept Analysis. ICFCA 2012. Lecture Notes in Computer Science(), vol 7278. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-29892-9_23
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DOI: https://doi.org/10.1007/978-3-642-29892-9_23
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