Next, we have to register on NVIDIA to be able to download cuDNN, which is a GPU-accelerated library of primitives for deep neural networks. Download the package of CUDA Toolkit 7.5 from the official link. Create a directory caffe/build and run cmake. If you have specified the routes and the CuDNN option correctly while installing caffe it will be compiled with CuDNN. Installing CuDNN just involves placing the files in the CUDA directory.