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How to build Marian on Windows with GPU support

Install prerequisites

The following SDK are required to build Marian with GPU support. At least one of them needs to be installed. If only CUDA is installed but not MKL, a GPU-only version will be build. If only MKL is installed and not CUDA, only the CPU version will be built. So if you are interested in only one functionality, you can ommit one of them. Install both for full functionality.

Cuda 10
- Base installer
MKL

Note: Patch for CUDA 9.2 error: Unsupported Visual Studio Version Error

This seems to work fine with CUDA 10.0.

When using CUDA 9.2, the latest versions of Visual Studio 2017 are not officially supported by CUDA. Two fixes are proposed:

Downgrade Visual Studio to a supported version

Edit the file <CUDA install path>\include\crt\host_config.h and change the line 131:

131     #if _MSC_VER < 1600 || _MSC_VER > 1914

into:

131     #if _MSC_VER < 1600 || _MSC_VER > 1915

For more information, read this nVidia forum

Check dependencies : `CheckDeps.bat`

In addition to the 2 previous prerequisites, Marian needs 2 libraries that you may already have on your system:

- Boost (1.58+)
- OpenSSL (optional for server)

The script CheckDeps.bat can be used to verify that all dependencies are found on your system. If not, it will use the vcpkg library manager to download and manage your dependencies for CMake.

If you already have a working vcpkg installation, this script can use it:

If vcpkg is in your PATH environment variable, the script will find it and use it automatically.
Otherwise, you need to edit the script and set the VCPKG_ROOT variable to the directory that contains the vcpkg.exe

If you prefer to manage yourself the dependencies, you can edit the script file to set the following variables to the respective installation paths. These variable can also be already set in your environment.

BOOST_INCLUDE_PATH and BOOST_LIB_PATH
OPENSSL_PATH

Build the project

There are 3 alternatives to build the project:

Use Visual Studio 2017 built-in support for CMake
Create a Solution file for Visual Studio
Use a script (MSBuild)

1. Use VS2017 with built-in support for CMake

VS2017 now allows to develop projects built with CMake without the need to generate VS projects and solutions. For more information, please read this article from the Visual C++ Team.

You just need to open the root folder of the git repository in VS (which contains the file CMakeSettings.json):

In an Explorer window, right-click then Open in Visual Studio
In a VS2017 instance, File > Open > Folder...

You may need to edit the file CMakeSettings.json to set the environment variable for the dependencies.

The developing experience is very similar than when using a solution file (Intellisense, build project with F7, debug, set breakpoints and watch variables, ...), except that the project configuration is done in 3 different files:

CMakeList.txt: this is the CMake source file from the original project.
It is used to configure the build targets, add/remove files to compile and configure the compiler flags.
CMakeSettings.json: this file is required to enable CMake integration in VS2017.
Use this file to configure the environment variables and the parameters passed to CMake to generate the project.

.vs\launch.vs.json: this is a user specific file and it is not commited in the Git repo
Use this file to configure the debugging targets.
For example:

{
    "version": "0.2.1",
    "defaults": {},
    "configurations": [
        {
        "type": "default",
        "name": "Training Basics",
        "project": "CMakeLists.txt",
        "projectTarget": "marian.exe",
        "currentDir": "D:\\Perso\\github\\marian\\marian-examples\\training-basics",
        "args": [
            "--devices 0",
            "--type amun",
            "--model model/model.npz",
            "--train-sets data/corpus.bpe.ro data/corpus.bpe.en",
            "--vocabs model/vocab.ro.yml model/vocab.en.yml",
            "--dim-vocabs 66000 50000",
            "--mini-batch-fit",
            "-w 3000",
            "--layer-normalization",
            "--dropout-rnn 0.2",
            "--dropout-src 0.1",
            "--dropout-trg 0.1",
            "--early-stopping 5",
            "--valid-freq 100",
            "--save-freq 10000",
            "--disp-freq 100",
            "--valid-metrics cross-entropy translation",
            "--valid-sets data/newsdev2016.bpe.ro data/newsdev2016.bpe.en",
            "--valid-script-path .\\scripts\\validate.bat",
            "--log model/train.log",
            "--valid-log model/valid.log",
            "--overwrite",
            "--keep-best",
            "--seed 1111",
            "--exponential-smoothing",
            "--normalize=1",
            "--beam-size=12",
            "--quiet-translation"
        ]
        }
    ]
}

2. Create solution and projects files for Visual Studio : `CreateVSProjects.bat`

If you have a previous version of Visual Studio, you will need to use CMake to generate the projects files.

The provided script CreateVSProjects.bat runs the dependency checks then invokes CMake with the right parameters to create the solutions for Visual Studio.

3. Use MSBuild : `BuildRelease.bat`

The last alternative is to use the script BuildRelease.bat that will:

Check the dependencies
Create the VS project files
Invoke MSBuild on these projects to build the targets in Release.

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