[jeffbee]

Google claims the opposite in "TPU v4: An Optically Reconfigurable Supercomputer for Machine Learning with Hardware Support for Embeddings " https://arxiv.org/abs/2304.01433

Despite various details I don't think that this is an area where Facebook is very different from Google. Both have terrifying amounts of datacenter to play with. Both have long experience making reliable products out of unreliable subsystems. Both have innovative orchestration and storage stacks. Meta hasn't published much or anything about things like reconfigurable optical switches, but that doesn't mean they don't have such a thing.