You Can't Launder a Postcode: Graph Machine Learning, from PageRank to Message Passing

Deep End Era. Engineering with Sankalp · Oct 28, 2026 · 1h 2m

A fictional payments company finds a fraud ring in which every single transaction looked clean; only the shape of the connections gave it away. Fraud lead Tunde Okafor and ML engineer Ingrid Solberg take it from a whiteboard to a graph neural network. Part nineteen of The Deep End's Machine Learning series explains message passing by ear, the history from PageRank to GraphSAGE and graph attention, drug discovery on molecular graphs, and the sneaky ways graph models fail. Cross-references: ep8, ep114, ep140, parts 1, 4, 5, 7, 9, 11, 12, 13, 17, 18, 20, 21. Larkspur Pay, Tunde and Ingrid are…