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Book Chapter
Combining Divide-and-Conquer and Separate-and-Conquer for Efficient and Effective Rule Induction
Book Series
Lecture Notes in Computer Science
Publisher
Springer Berlin / Heidelberg
ISSN
0302-9743 (Print) 1611-3349 (Online)
Volume
Volume 1634/1999
Book
Inductive Logic Programming
DOI
10.1007/3-540-48751-4
Copyright
1999
ISBN
978-3-540-66109-2
DOI
10.1007/3-540-48751-4_5
Pages
33-43
Subject Collection
Computer Science
SpringerLink Date
Friday, January 01, 1999
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Combining Divide-and-Conquer and Separate-and-Conquer for Efficient and Effective Rule Induction
Henrik Boström
3
and Lars Asker
3
(3)
Dept. of Computer and Systems Sciences, Stockholm University and Royal Institute of Technology, Electrum 230, 164 40 Kista, Sweden
Abstract
Divide-and-Conquer (DAC) and Separate-and-Conquer (SAC) are two strategies for rule induction that have been used extensively. When searching for rules DAC is maximally conservative w.r.t. decisions made during search for previous rules. This results in a very efficient strategy, which however suffers from difficulties in effectively inducing disjunctive concepts due to the
replication problem
. SAC on the other hand is maximally liberal in the same respect. This allows for a larger hypothesis space to be searched, which in many cases avoids the replication problem but at the cost of lower efficiency. We present a hybrid strategy called Reconsider-and-Conquer (RAC), which handles the replication problem more effectively than DAC by reconsidering some of the earlier decisions and allows for more efficient induction than SAC by holding on to some of the decisions. We present experimental results from propositional, numerical and relational domains demonstrating that RAC significantly reduces the replication problem from which DAC suffers and is several times (up to an order of magnitude) faster than SAC.
Henrik
Boström
Email:
henke@dsv.su.se
Lars
Asker
Email:
asker@dsv.su.se
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