Beam search logit refactor #771
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…logits instead of one memcpy per logit.
…CPU backend. Should be more performant + the code is more readable.
…to top of modified files
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Description
Refactors the beam search when --n-best is specified so the retrieval of logits from the GPU is batched.
On a standard transformer with 3 decoder layers, this change saw improvements of up tp 10% when --n-best is specified. It also has the benefit of reducing CPU - GPU communication.
This does not contain a table similar to other PRs from #743 since the model motivating this change is different from the proxy model used in #743.
List of changes:
Added dependencies: none
How to test
Ran regression tests and they passed.
CMake command: cmake .. -DCOMPILE_CPU=on -DCOMPILE_CUDA=on -DUSE_SENTENCEPIECE=on -DUSE_STATIC_LIBS=off -DCOMPILE_SERVER=off -DUSE_FBGEMM=on -DCOMPILE_CUDA_SM35=off -DCOMPILE_CUDA_SM50=off -DCOMPILE_CUDA_SM60=off -DCOMPILE_CUDA_SM70=on -DCOMPILE_CUDA_SM75=off -DCOMPILE_TESTS=on
Ubuntu - 18.04.3 LTS
nvcc - 10.1.243
gcc - 7.5.0
Checklist