Performance comparison of LSTM with and without cuDNN(v5) in Chainer By Motoki Sato Mar 15, 2017 In General We compare the performance of an LSTM network both with and without cuDNN in Chainer. The NVIDIA CUDA® Deep Neural Network library (cuDNN) is a GPU-accelerated library of primitives for deep neural networks. cuDNN provides highly tuned implementations for standard routines such as LSTM, CNN.