Colour refinement is at the heart of all the most efficient graph isomorphism software packages. In this paper we present a method for extending the applicability of refinement algorithms to directed graphs with weighted edges. We use {Traces} as a reference software, but the proposed solution is easily transferrable to any other refinement-based graph isomorphism tool in the literature. We substantiate the claim that the performances of the original algorithm remain substantially unchanged by showing experiments for some classes of benchmark graphs.
@InProceedings{piperno:LIPIcs.SEA.2018.30, author = {Piperno, Adolfo}, title = {{Isomorphism Test for Digraphs with Weighted Edges}}, booktitle = {17th International Symposium on Experimental Algorithms (SEA 2018)}, pages = {30:1--30:13}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-070-5}, ISSN = {1868-8969}, year = {2018}, volume = {103}, editor = {D'Angelo, Gianlorenzo}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.SEA.2018.30}, URN = {urn:nbn:de:0030-drops-89659}, doi = {10.4230/LIPIcs.SEA.2018.30}, annote = {Keywords: Practical Graph Isomorphism, Weighted Directed Graphs, Partition Refinement} }
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