Graphics processors

Disclosed herein is a graphics processor that comprises a programmable execution unit operable to execute programs to perform graphics processing operations. The graphics processor further comprises a dedicated machine learning processing circuit operable to perform processing operations for machine learning processing tasks. The machine learning processing circuit is in communication with the programmable execution unit internally to the graphics processor. In this way, the graphics processor can be configured such that machine learning processing tasks can be performed by the programmable execution unit, the machine learning processing circuit, or a combination of both, with the different units being able to message each other accordingly to control the processing.