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Apriori Algorithm

Author:

Apriori is an effcient frequent pattern mining algorithm

We now develop an efficient way to generate all frequent patterns without enumerating all possible itemsets. We will use downward closer property of itemsets in this algorithm.

Downward closer is the property that

if an itemset is a frequent item set, all sub-patterns are also frequent patterns.
However, if a pattern is not a frequent pattern, any super-patterns (patterns containing it) are not frequent patterns.

This algorithm is sound and complete: if x is a frequent pattern, Apriori algorithm will find it, and if Apriori algorithm find a frequent item set, it is indeed a frequent item set.

We will now demonstrate how frequent itemsets are mined using Apriori algorithm.

** Please use Google Chrome to play the video

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