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Efficiency Mining Frequent Itemset On Massive Data


  • Project Code :
  • TCREAN19_03
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Efficiently mining frequent item sets on massive data


Frequent item set mining is an important operation to return all item sets in the transaction table, which occur as a subset of at least a specified fraction of the transactions. The existing algorithms cannot compute frequent item sets on massive data efficiently, since they either require multiple-pass scans on the table, or construct complex data structures which normally exceed the available memory on massive data. This paper proposes a novel precomputation based PFIM algorithm to compute the frequent item sets quickly on massive data. PFIM treats the transaction table as two parts: the large old table storing historical data and the relatively small new table storing newly generated data. PFIM first pre-constructs the quasi frequent item sets on the old table whose supports are above the lower-bound of the practical support level. Given the specified support threshold, PFIM can quickly return the required frequent item sets on the table by utilizing the quasi-frequent item sets. Three pruning rules are presented to reduce the size of the involved candidates. An incremental update strategy is devised to efficiently re-construct the quasi-frequent item sets when the tables are merged. The extensive experimental results, conducted on synthetic and real-life data sets, show that PFIM has a significant advantage over the existing algorithms and runs two orders of magnitude faster than the latest algorithm.

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