The 4th AccML workshop brought together researchers working in the fields of Machine Learning and System Architecture to discuss requirements, opportunities, challenges and next steps for developing novel approaches for machine learning systems. This one day workshop, co-located within the greater HiPEAC conference, welcomed researchers from a variety of subfields. Eleven speakers presented topics meant to spark discussion and encourage dialogue. Eflows4HPC researcher, Enrique S. Quintana-Ortí, presented on the topic of ‘Convultion Operators for Deep Learning Interference: Libraries or Automatic Generation?’. For more information on the workshop and the program, visit https://accml.dcs.gla.ac.uk .