Figure 2 - uploaded by Claudio Lucchese
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1: (top) The input transactional dataset D, represented in its horizontal form. (bottom) Lattice of all the frequent itemsets with σ = 1.
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... principle, every itemset in powerset P(I) is potentially frequent, and a whole scan of the dataset is required to calculate its exact support. As usual we will use a lattice of itemsets, where node are in lexicographical order, to visualize such search space as in Figure 2.1. ...
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