Exercises

 

 

 

 

 

 

 

CHARM uses a vertical data format, and the frequency of an itemset is simply the length of its TID list. Larger itemsets are obtained by intersection of TID sets.

So support computation becomes simple and direct:

• no full DB rescan is needed for every candidate,
• just intersect TID sets.

 

 

 

 

 

 

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