Mixed dtypes #644
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Mixed dtypes #644
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This is currently based on #635 , because there we ended up needing to reduce losses in bf16.
So this PR first does some malloc-and-point generalization for allowing multiple dtypes, and then changes layernorm statistics and losses to fp32.
With layernorm stats in fp32, we can reliably avoid their recomputation even if we recompute the layer itself, and these tensors are still tiny, so it doesn't cost us much.