Adding attention_reshape (inference only) kernels. #497
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Tried to implement
cat
but there were some weird issues, and it wascausing a ton of kernels being called, with each some device to host sync (huge bottleneck).
This PR adds a pretty specific reshape for
(qkv, past_key, past_value)
useful forinference run of transformer models. For instance
gpt2
(https://github.com/Narsil/fast_gpt2)