Depth first algorithms and inferencing for AFD mining

  • Authors:
  • Jeremy T. Engle;Edward L. Robertson

  • Affiliations:
  • Indiana University, Bloomington, IN;Indiana University, Bloomington, IN

  • Venue:
  • IDEAS '09 Proceedings of the 2009 International Database Engineering & Applications Symposium
  • Year:
  • 2009

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Abstract

The task of searching a powerset lattice is part of many problem domains. In Approximate Functional Dependencies (AFDs) mining the algorithm used for searching lattices has been bottom-up breadth first search (BU-BFS). This paper introduces as part of the MoLS framework a method for managing and using inferred information about the status of rules in the lattice. BU-BFS however has limited ability to use inferred information. This paper instead explores the ability of depth first search (DFS) algorithms to use inferred information. The focus on algorithms is motivated by the idea that improved performance from an algorithm is more likely to persist as users make customizations or use different approximation measures. Algorithms are experimentally evaluated and performance is judged based on the portion of the search space for which the approximation measure has been calculated. This presents a machine independent evaluation where differences in performance can be directly attributed to the algorithm.