Towards Rare Itemset Mining

Laszlo Szathmary (1) , Amedeo Napoli (1) , Petko Valtchev (2)

1 ORPAILLEUR - Knowledge representation, reasonning
2 LATECE Laboratory - UQAM Montreal - Laboratory for Research on Technology for ECommerce

We describe here a general approach for rare itemset mining. While mining literature has been almost exclusively focused on frequent itemsets, in many practical situations rare ones are of higher interest (e.g., in medical databases, rare combinations of symptoms might provide useful insights for the physicians). Based on an examination of the relevant substructures of the mining space, our approach splits the rare itemset mining task into two steps, i.e., frequent itemset part traversal and rare itemset listing. We propose two algorithms for step one, a naive and an optimized one, respectively, and another algorithm for step two. We also provide some empirical evidence about the performance gains due to the optimized traversal.

Mots clés: itemset extraction; rare item problem; rare itemsets

Domaines: Recherche d'information [cs.IR]

Laszlo Szathmary, Amedeo Napoli, Petko Valtchev. Towards Rare Itemset Mining. 19th IEEE International Conference on Tools with Artificial Intelligence (ICTAI '07), Oct 2007, Patras, Greece. pp.305--312. ⟨inria-00189424⟩