Install DGL
============

At this stage, we recommend installing DGL from ``conda`` or ``pip``.

System requirements
-------------------
Currently DGL is tested on

* Ubuntu 16.04
* macOS X
* Windows 10

DGL is expected to work on all Linux distributions later than Ubuntu 16.04, macOS X, and
Windows 10.

DGL also requires the Python version to be 3.5 or later.  Python 3.4 or less is not
tested, and Python 2 support is coming.

DGL supports multiple tensor libraries (e.g. PyTorch, MXNet) as backends; refer
`Working with different backends`_ for requirements on backends and how to select a
backend.

Starting from 0.3 DGL is separated into CPU and CUDA builds.  The builds share the
same Python package name, so installing DGL with CUDA 9 build after installing the
CPU build will overwrite the latter.

Install from conda
----------------------
One can either grab `miniconda <https://conda.io/miniconda.html>`_ or
the full `anaconda <https://www.anaconda.com/download/>`_ if ``conda``
has not been installed.

Once the conda environment is activated, run

.. code:: bash

   conda install -c dglteam dgl              # For CPU Build
   conda install -c dglteam dgl-cuda9.0      # For CUDA 9.0 Build
   conda install -c dglteam dgl-cuda10.0     # For CUDA 10.0 Build

Install from pip
----------------
For CPU builds, one can simply run the following command to install via ``pip``:

.. code:: bash

   pip install dgl
   
For CUDA builds, one needs to specify the CUDA version:

.. code:: bash

   pip install dgl           # For CPU Build
   pip install dgl-cu90      # For CUDA 9.0 Build
   pip install dgl-cu92      # For CUDA 9.2 Build
   pip install dgl-cu100     # For CUDA 10.0 Build

We also provides nightly build from master branch, you can install it by:

.. code:: bash

   pip install --pre dgl           # For CPU Build
   pip install --pre dgl-cu90      # For CUDA 9.0 Build
   pip install --pre dgl-cu92      # For CUDA 9.2 Build
   pip install --pre dgl-cu100     # For CUDA 10.0 Build


Working with different backends
-------------------------------

Currently DGL supports PyTorch and MXNet.

Switching backend
`````````````````

The backend is controlled by ``DGLBACKEND`` environment variable, which defaults to
``pytorch``.  Currently it supports the following values:

+---------+---------+--------------------------------------------------+
| Value   | Backend | Memo                                             |
+=========+=========+==================================================+
| pytorch | PyTorch | Requires 0.4.1 or later; see                     |
|         |         | `official website <https://pytorch.org>`_        |
+---------+---------+--------------------------------------------------+
| mxnet   | MXNet   | Requires MXNet 1.5                               |
|         |         |                                                  |
|         |         | .. code:: bash                                   |
|         |         |                                                  |
|         |         |    pip install mxnet                             |
|         |         |                                                  |
|         |         | or cuda version (e.g. for cuda 9.0)              |
|         |         |                                                  |
|         |         | .. code:: bash                                   |
|         |         |                                                  |
|         |         |    pip install mxnet-cu90                        |
|         |         |                                                  |
+---------+---------+--------------------------------------------------+
| numpy   | NumPy   | Does not support gradient computation            |
+---------+---------+--------------------------------------------------+

.. _install-from-source:

Install from source
-------------------
First, download the source files from GitHub:

.. code:: bash

   git clone --recursive https://github.com/dmlc/dgl.git

One can also clone the repository first and run the following:

.. code:: bash

   git submodule init
   git submodule update

Linux
`````

Install the system packages for building the shared library, for Debian/Ubuntu
users, run:

.. code:: bash

   sudo apt-get update
   sudo apt-get install -y build-essential build-dep python3-dev make cmake

For Fedora/RHEL/CentOS users, run:

.. code:: bash

   sudo yum install -y gcc-c++ python3-devel make cmake

Build the shared library. Use the configuration template ``cmake/config.cmake``.
Copy it to either the project directory or the build directory and change the
configuration as you wish. For example, change ``USE_CUDA`` to ``ON`` will
enable cuda build. You could also pass ``-DKEY=VALUE`` to the cmake command
for the same purpose.

- CPU-only build:
   .. code:: bash

      mkdir build
      cd build
      cmake ..
      make -j4
- Cuda build:
   .. code:: bash

      mkdir build
      cd build
      cmake -DUSE_CUDA=ON ..
      make -j4

Finally, install the Python binding.

.. code:: bash

   cd ../python
   python setup.py install

macOS
`````

Installation on macOS is similar to Linux. But macOS users need to install
building tools like clang, GNU Make, cmake first.

Tools like clang and GNU Make are packaged in **Command Line Tools** for macOS. To
install:

.. code:: bash

   xcode-select --install

To install other needed packages like cmake, we recommend first installing
**Homebrew**, which is a popular package manager for macOS. Detailed
instructions can be found on its `homepage <https://brew.sh/>`_.

After installation of Homebrew, install cmake by:

.. code:: bash

   brew install cmake

Then go to root directory of DGL repository, build shared library and
install Python binding for DGL:

.. code:: bash

   mkdir build
   cd build
   cmake -DUSE_OPENMP=off ..
   make -j4
   cd ../python
   python setup.py install

We tested installation on macOS X with clang 10.0.0, GNU Make 3.81, and cmake
3.13.1.

Windows
```````

Currently Windows source build is tested with CMake and MinGW/GCC.  We highly recommend
using CMake and GCC from `conda installations <https://conda.io/miniconda.html>`_.  To
do so, run

.. code:: bash

   conda install cmake m2w64-gcc m2w64-make

Then build the shared library and install the Python binding:

.. code::

   md build
   cd build
   cmake -DCMAKE_CXX_FLAGS="-DDMLC_LOG_STACK_TRACE=0 -DDGL_EXPORTS" -DCMAKE_MAKE_PROGRAM=mingw32-make .. -G "MSYS Makefiles"
   mingw32-make
   cd ..\python
   python setup.py install

We also support building DGL with MSBuild.  With `MS Build Tools <https://go.microsoft.com/fwlink/?linkid=840931>`_
and `CMake on Windows <https://cmake.org/download/>`_ installed, run the following
in VS2017 x64 Native tools command prompt:

.. code::

   MD build
   CD build
   cmake -DCMAKE_CXX_FLAGS="/DDGL_EXPORTS" -DCMAKE_CONFIGURATION_TYPES="Release" .. -G "Visual Studio 15 2017 Win64"
   msbuild dgl.sln
   cd ..\python
   python setup.py install
