Abstract
Mining High Utility Itemset (HUI) from incremental database discovers itemsets making much profit from newest transactions. Therefore, mining HUIs from incremental database are important for planing business. Previous studies on mining exact HUIs consume both time and memory for computing. Therefore, fast algorithms for mining compact HUIs have proposed. However, studies on mining compact HUIs still take a long time and consume much memory because of considering all itemsets of items in a transaction. Moreover, decision making in business is more effective based on HUIs containing several items. In this paper, we propose a novel effective algorithm for mining k-item HUIs that meets the need of decision makers and overcomes the limits of mining compact HUIs. We present a simple list to store k-itemsets appearing during scanning database. This list stores items and utility of each itemset. Our approach perform two ways of database segmentation to mine all k-itemsets. For each way of database segmentation, we run the following algorithm. It consists of two main steps including segmenting the current database to form sub-partitions and mining k-itemsets from each sub-partition. k-item HUIs are extracted from the list based on the utility. The proposed algorithm obtain advantages including without candidate generation and without re-scanning when changing the threshold of utility. Experiments are conducted on dense benchmark databases. Results of experiments show that our algorithm is better than state-of-the-art methods.
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Hoa, N.T., Van Tao, N. (2021). An Effective Approach for Mining k-item High Utility Itemsets from Incremental Databases. In: Cong Vinh, P., Rakib, A. (eds) Context-Aware Systems and Applications. ICCASA 2021. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 409. Springer, Cham. https://doi.org/10.1007/978-3-030-93179-7_8
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