Implement the initial version of conv from cuDNN
Implement the initial version of conv from cuDNN

amunmt/marian,marian-nmt/marian-train,DianaDespa/marian-train,emjotde/Marian,emjotde/amunn,emjotde/amunn,emjotde/amunn,amunmt/marian,marian-nmt/marian-train,emjotde/amunn,marian-nmt/marian-train,amunmt/marian,marian-nmt/marian-train,DianaDespa/marian-train,DianaDespa/marian-train,emjotde/Marian,emjotde/amunmt,emjotde/amunmt,DianaDespa/marian-train,marian-nmt/marian-train,emjotde/amunmt,emjotde/amunmt,DianaDespa/marian-train