Before installing Chainer¶
We recommend these platforms.
Chainer is supported on Python 2.7.6+, 3.4.3+, 3.5.1+. Chainer uses C++ compiler such as g++. You need to install it before installing Chainer. This is typical installation method for each platform:
# Ubuntu 14.04 $ apt-get install g++ # CentOS 7 $ yum install gcc-c++
If you use old
setuptools, upgrade it:
$ pip install -U setuptools
Chainer depends on these Python packages:
- cuDNN v2, v3, v4, v5, v5.1
Caffe model support
- Protocol Buffers
- protobuf>=3.0.0 is required for Py3
All these libraries are automatically installed with
Image dataset is optional
HDF5 serialization is optional
- h5py 2.5.0
Install Chainer via pip¶
We recommend to install Chainer via pip:
$ pip install chainer
Install Chainer from source¶
You can use
setup.py to install Chainer from source:
$ tar zxf chainer-x.x.x.tar.gz $ cd chainer-x.x.x $ python setup.py install
When an error occurs...¶
-vvvv option with
That shows all logs of installation. It may helps you:
$ pip install chainer -vvvv
Install Chainer with CUDA¶
You need to install CUDA Toolkit before installing Chainer.
If you have CUDA in a default directory or set
CUDA_PATH correctly, Chainer installer finds CUDA automatically:
$ pip install chainer
Chainer installer looks up
CUDA_PATH environment variable first.
If it is empty, the installer looks for
nvcc command from
PATH environment variable and use its parent directory as the root directory of CUDA installation.
nvcc command is also not found, the installer tries to use the default directory for Ubuntu
If you installed CUDA into a non-default directory, you need to specify the directory with
CUDA_PATH environment variable:
$ CUDA_PATH=/opt/nvidia/cuda pip install chainer
If you want to use
sudo to install Chainer, note that
sudo command initializes all environment variables.
CUDA_PATH environment variable inside
sudo like this:
$ sudo CUDA_PATH=/opt/nvidia/cuda pip install chainer
Install Chainer with CUDA and cuDNN¶
cuDNN is a library for Deep Neural Networks that NVIDIA provides.
Chainer can use cuDNN.
If you want to enable cuDNN, install cuDNN and CUDA before installing Chainer.
We recommend you to install cuDNN to CUDA directory.
For example if you uses Ubuntu Linux, copy
.h files to
include directory and
.so files to
$ cp /path/to/cudnn.h $CUDA_PATH/include $ cp /path/to/libcudnn.so* $CUDA_PATH/lib64
The destination directories depend on your environment.
Install Chainer for developers¶
Chainer uses Cython (>=0.23).
Developers need to use Cython to regenerate C++ sources from
We recommend to use
-e option for editable mode:
$ pip install -U cython $ cd /path/to/chainer/source $ pip install -e .
Users need not to install Cython as a distribution package of Chainer only contains generated sources.
Support image dataset¶
Install Pillow manually to activate image dataset. This feature is optional:
$ pip install pillow
Support HDF5 serialization¶
Install h5py manually to activate HDF5 serialization. This feature is optional:
$ pip install h5py
Before installing h5py, you need to install libhdf5. It depends on your environment:
# Ubuntu 14.04 $ apt-get install libhdf5-dev # CentOS 7 $ yum -y install epel-release $ yum install hdf5-devel
Use pip to uninstall Chainer:
$ pip uninstall chainer
When you upgrade Chainer,
pip sometimes installed various version of Chainer in
Please uninstall it repeatedly until
pip returns an error.
$ pip install -U chainer
If you want to reinstall Chainer, please uninstall Chainer and then install it.
We recommend to use
--no-cache-dir option as
pip sometimes uses cache:
$ pip uninstall chainer $ pip install chainer --no-cache-dir
When you install Chainer without CUDA, and after that you want to use CUDA, please reinstall Chainer. You need to reinstall Chainer when you want to upgrade CUDA.
What “recommend” means?¶
We tests Chainer automatically with Jenkins. All supported environments are tested in this environment. We cannot guarantee that Chainer works on other environments.
The installer says “hdf5.h is not found”¶
You don’t have libhdf5. Please install hdf5. See Before installing Chainer.
You maybe failed to install Cython. Please install it manually. See When an error occurs....