400 CPU's expensive?
at standard instance pricing EC2 m5.24xlarge with 96 vCPU's is around a fiver, for one hour - dropping to 60p if you can use spot pricing and dont care when the learning run is run.
so you can probably get 400 CPU's rented for the same price as a helping of fish n' chips, (except at Christmas)
I agree that it's not AI , it's just ML