In one general aspect, a computer system can include instructions configured to store on a non-transitory computer-readable storage medium. The computer system can include a subgraph transformer configured to transform a plurality of subgraphs of a source graph into a plurality of transformed subgraphs, and configured to define a target graph that is a transformed version of the source graph based on the plurality of transformed subgraphs. The computer system can include a change detector configured to receive an indicator that a portion of the source graph has been changed, and a synchronization module configured to synchronize a portion of the target graph with the changed portion of the source graph.