Weisfeiler-Lehman graph isomorphism test Weisfeiler Lehman algorithm https://www.google.com/search?q=Weisfeiler-Lehman+graph+isomorphism+test https://davidbieber.com/post/2019-05-10-weisfeiler-lehman-isomorphism-test/ The Weisfeiler-Lehman Method and Graph Isomorphism Testing The Weisfeiler-Lehman algorithm and estimation on graphs by Alex Smola