Supported Platforms

Falkon is only tested on Linux.

GPU support is achieved via CUDA, so using Falkon from Windows will be tricky.

Using the library from the CPU only is much more portable since there is no CUDA requirement. CPU-only Falkon is thus likely to work on Windows and Mac OS easily.


PyTorch and CUDA

Falkon depends on PyTorch, and on the NVIDIA Toolkit (for NVIDIA GPU support) which is usually installed alongside PyTorch. PyTorch can be installed in several ways by following the instructions at Install PyTorch. If GPU support is desired, make sure that PyTorch CUDA bindings are working:

import torch
assert torch.cuda.is_available()

Intel MKL

If Falkon is not installed with GPU support, it will try to link to Intel MKL to speed-up certain sparse operations. MKL shared libraries are usually distributed with numpy, so this should not be a problem. In case sparse matrix support is not needed, the MKL library will not be loaded.


Falkon uses a patched version of KeOps, therefore until the patches are merged in the KeOps library, users will need to uninstall existing KeOps installations (if present), and install our patched version.

The patched version is available as a submodule of the Falkon repository. To install it, you can do the following:

$ git clone --recurse-submodules
$ cd falkon/
$ pip install ./keops


After having installed KeOps, you are ready to install Falkon with pip (from the root of the git tree):

$ pip install .

This will take a while since there are both Cython extensions which need to be compiled (if Cython is installed), and PyTorch extensions which take some time to compile.

Testing the installation

To check that everything works correctly you can follow the Kernel ridge regression notebook.