Any idea who makes it? It's probably close in architecture to GPUs, the kind of thing Nvidia and AMD are positioned to capitalise on.
Altera, an Intel subsidiary. [1] 1. https://www.bloomberg.com/news/articles/2017-07-24/quest-for...
While it is possible they are using FPGAs for the Hololens Processing Unit, I seriously doubt it. The FPGA needed to exceed the performance of a high-end mobile GPU (OpenCL/CUDA for Deep Learning/AI) would have an excessive power consumption for a mobile device.
Another factor is that higher end FPGAs are expensive ($200+ wholesale) and typically cost thousands each, and not suited to a mass produced consumer device.
As for who made this HPU, I'd say AMD helped design it and GlobalFoundries (or maybe TSMC) are doing the production.