NDLI: RWS-Diff: flexible and efficient change detection in hierarchical data

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RWS-Diff: flexible and efficient change detection in hierarchical data

Content Provider	ACM Digital Library
Author	Finis, Jan P. Kemper, Alfons Raiber, Martin Brunel, Robert Augsten, Nikolaus Färber, Franz
Abstract	The problem of generating a cost-minimal edit script between two trees has many important applications. However, finding such a cost-minimal script is computationally hard, thus the only methods that scale are approximate ones. Various approximate solutions have been proposed recently. However, most of them still show quadratic or worse runtime complexity in the tree size and thus do not scale well either. The only solutions with log-linear runtime complexity use simple matching algorithms that only find corresponding subtrees as long as these subtrees are equal. Consequently, such solutions are not robust at all, since small changes in the leaves which occur frequently can make all subtrees that contain the changed leaves unequal and thus prevent the matching of large portions of the trees. This problem could be avoided by searching for similar instead of equal subtrees but current similarity approaches are too costly and thus also show quadratic complexity. Hence, currently no robust log-linear method exists. We propose the random walks similarity (RWS) measure which can be used to find similar subtrees rapidly. We use this measure to build the RWS-Diff algorithm that is able to compute an approximately cost-minimal edit script in log-linear time while having the robustness of a similarity-based approach. Our evaluation reveals that random walk similarity indeed increases edit script quality and robustness drastically while still maintaining a runtime comparable to simple matching approaches.
Starting Page	339
Ending Page	348
Page Count	10
File Format	PDF
ISBN	9781450322638
DOI	10.1145/2505515.2505763
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2013-10-27
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Change detection Tree edit script Random walk Xml Hierarchical data Tree edit distance Tree diff Similarity search
Content Type	Text
Resource Type	Article

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