Small optimizations#768

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rhenry-nv:small_optimizations

Commits on Dec 2, 2020

Removed memcpy when batchA == batchB for batched matrix multiplication. Reduced the memcpys from 3 to 1 for the general case.
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Issue matrix multiplications in cublas and cusparse to the per thread default stream. This have issue each thread issue calls to their own stream instead of the global default stream when marian is…
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Reduced the number of times indices need to be copied to the GPU
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Adds licenses to files changed
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Updates licences
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Rounds input batches to a multiple of 8 when the gpu backend is being used for better tensor core usage.
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updates changelog
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Commits on Dec 15, 2020

Commits on Mar 5, 2021

Merge remote-tracking branch 'public/master' into small_optimizations
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