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Finding the set of all frequent patterns is simply done by finding the set of local maximal for each COFItree.
In this section we present a performance study to evaluate our new approach YAFIMA against most of the state-of-art algorithms that mine all, closed and maximal patterns.
For the set of closed itemsets and the set of maximal itemsets FP-CLOSED and FPMAX mined up to 50M transactions, while COFI-CLOSED and COFI-MAX mined all databases up to 100M transactions efficiently.
In this work we presented YAFIMA, a set of new algorithms for mining all, closed and maximal patterns.
B) Remove all frequent-path-bases that are subset of already found maximal patterns: Each frequent-path-base is checked first to see if it is part of an already existing maximal pattern.