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Computational Complexity of Frequent Itemset Mining

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Questions and Answers

What is the main purpose of itemset merging in hybrid tree projection?

To combine items with the same support threshold (correct)
To prune frequent items from the header table
To reduce the search space in pattern mining
To find the maximum frequent itemsets

In MaxMiner, what is the purpose of the first scan?

To find the support for TID items
To find the maximum frequent itemsets
To prune infrequent items
To find frequent items (correct)

What is the condition for an itemset X to be a max-pattern?

X is frequent and has no frequent superpattern (correct)
X is infrequent and has no frequent superpattern
X is infrequent and has no frequent subpattern
X is frequent and has no frequent subpattern

What is the purpose of subset infrequency pruning in MaxMiner?

To reduce the search space in pattern mining (B) Signup and view all the answers

What is the main difference between Apriori and FP-growth methods?

Apriori mines frequent patterns from horizontal data, while FP-growth mines from vertical data (C) Signup and view all the answers

What is the purpose of efficient subset checking in hybrid tree projection?

To reduce the search space in pattern mining (A) Signup and view all the answers

What is the purpose of sub-itemset pruning in hybrid tree projection?

To prune X and all of X’s descendants if X⊂Y and sup(X)=sup(Y) (B) Signup and view all the answers

What is the main idea behind ECLAT (Equivalence Class Transformation)?

Mining by exploring vertical data format (D) Signup and view all the answers

What is the purpose of superset frequency pruning in MaxMiner?

To reduce the search space in pattern mining (D) Signup and view all the answers

What is the condition for pruning a local frequent item in hybrid tree projection?

The item has the same support (< threshold) in several header tables at different levels (B) Signup and view all the answers

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