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Sampling for Frequent Patterns
- Select a sample of original database, mine frequent patterns within sample using Apriori
- Scan database once to verify frequent itemsets found in sample, only borders of closure of frequent patterns are checked
- Example: check abcd instead of ab, ac, …, etc.
- Scan database again to find missed frequent patterns
- H. Toivonen. Sampling large databases for association rules. In VLDB’96
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