move all kernels into a dedicated cuda stream #448
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In preparation for #361, this restores the existence of a single "main stream" cuda stream.
To make reasoning about parallelism easier, at least in the near future, this change also makes each
gpt2_*function explicitly synchronous.Move the loss calculation from forward to backward, because that gives us a better opportunity to overlap things.
It also enables a slight optimization, in that we now no longer update dlogits in the validation code path.