CUPY INSTALLATION ON UBUNTU18.04 MEMO

s I had encountered errors when I tried to install cupy,on Ubuntu 18.04

I upgrade cudnn. Then I succeeded installation of cupy.

The following is a notes on the procedure.

1. after uninstallation of existing pip, reinstall pip

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
python3 get-pip.py -user -vv
python get-pip.py -user -vv

2. install a recent cuda-toolkit

2-1. download the cuda toolkit from https://developer.nvidia.com/cuda-toolkit-archive

2.2 install cuda-toolkit
sudo dpkg -i cuda-repo-ubuntu1804-10-0-local-10.0.130-410.48_1.0-1_amd64.deb
sudo apt-key add /var/cuda-repo-10-0-local-10.0.130-410.48/7fa2af80.pub
sudo apt-get update

sudo apt-get install cuda

3. install cudnn
   3-1 download packages for ubuntu18.04 from https://developer.nvidia.com/rdp/cudn
   n-download

3-2. install cudnn packages
sudo dpkg -i libcudnn7_7.3.1.20-1+cuda10.0_amd64.deb
sudo dpkg -i libcudnn7-dev_7.3.1.20-1+cuda10.0_amd64.deb
sudo dpkg -i libcudnn7-doc_7.3.1.20-1+cuda10.0_amd64.deb

3-3. replace the old cuda path with cuda-10.0 path
nano ~/.bashrc
' NVIDIA CUDA Toolkit
export PATH=/usr/local/cuda-10.0/bin:$PATH
export LD_LIBRARY_PATH=/usr/local/cuda-10.0/lib64:$LD_LIBRARY_PATH

source ~/.bashrc
echo $PATH |grep cuda

4. install cupy

pip3 install -user cupy

python3
import cupy
import cupy.cudnn

failed.
modulenotfounderror: no module named ‘cupy.cudnn’

so I did the following
pip3 uninstall cupy

set $CUDA_PATH as /usr/local/cuda

pip3 -v install -user cupy -no-cache-dir

python3
import cupy
import cupy.cudnn

No error.