Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Efficient frequent connected subgraph mining in graphs of bounded treewidth
 Theoretical computer science 411 (2010), Nr.3133, S.27842797 ISSN: 03043975 

 Englisch 
 Zeitschriftenaufsatz 
 Fraunhofer IAIS () 
 listing algorithm; frequent pattern; treewidth; graph mining; data mining 
Abstract
The frequent connected subgraph mining problem, i.e., the problem of listing all connected graphs that are subgraph isomorphic to at least a certain number of transaction graphs of a database, cannot be solved in output polynomial time in the general case. If, however, the transaction graphs are restricted to forests then the problem becomes tractable. In this paper we generalize the positive result on forests to graphs of bounded treewidth. In particular, we show that for this class of transaction graphs, frequent connected subgraphs can be listed in incremental polynomial time. Since subgraph isomorphism remains NPcomplete for bounded treewidth graphs, the positive complexity result of this paper shows that efficient frequent pattern mining is possible even for computationally hard pattern matching operators.