KGNet is a knowledge graph platform with full support for graph machine learning (GML)-enabled queries. We designed KGNet as an extension on top of existing RDF engines. KGNet provides GML as a service (GMLaaS) to automate the training of GML models on KGs. In KGNet, we collect the trained models’ metadata and maintain a transparent RDF graph associated with the target knowledge graph (KG). Using this metadata graph, KGNet can optimize and execute GML-enabled queries, which apply the trained models on the target KG.