Graph Summaries for Subgraph Frequency Estimation

TitleGraph Summaries for Subgraph Frequency Estimation
Publication TypeConference Paper
Year of Publication2008
AuthorsAngela Maduko, Kemafor Anyanwu, Paul Schliekelman, Amit Sheth
Conference Name5th European Semantic Web Conference (ESWC2008)
Date Published06/2008
Conference LocationTenerife, Spain
KeywordsData summaries, Frequency estimation, Graph summaries, RDF graph patterns, RDF query optimizer

A fundamental problem related to graph structured databases is searching for substructures. One issue with respect to optimizing such searches is the ability to estimate the frequency of substructures within a query graph. In this work, we present and evaluate two techniques for estimating the frequency of subgraphs from a summary of the data graph. In the first technique, we assume that edge occurrences on edge sequences are position independent and summarize only the most informative dependencies. In the second technique, we prune small subgraphs using a valuation scheme that blends information about their importance and estimation power. In both techniques, we assume conditional independence to estimate the frequencies of larger subgraphs. We validate the effectiveness of our techniques through experiments on real and synthetic datasets.

Full Text

Angela Maduko, Kemafor Anyanwu,Amit Sheth, and Paul Schliekelman, 'Graph Summaries for Subgraph Frequency Estimation, ' 5th European Semantic Web Conference (ESWC2008), Tenerife, Spain, June 1-5, 2008.

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