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The fastai library simplifies training fast and accurate neural nets using modern best practices. See the fastai website to get started. The library is based on research in to deep learning best practices undertaken at, and includes "out of the box" support for vision, text, tabular, and collab (collaborative filtering) models. For brief examples, see the examples folder; detailed examples are provided in the full documentation. For instance, here's how to train an MNIST model using resnet18 (from the vision example):

data = image_data_from_folder(MNIST_PATH)
learn = ConvLearner(data, tvm.resnet18, metrics=accuracy)

Note for students

If you are using fastai for any course, you need to use fastai 0.7.x. Please ignore the rest of this document, which is written for fastai 1.0.x, and instead follow the installation instructions here.

Note: If you want to learn how to use fastai v1 from its lead developer, Jeremy Howard, he will be teaching it in the Deep Learning Part I course at the University of San Francisco from Oct 22nd, 2018.


fastai-1.x can be installed with either conda or pip package managers and also from source. At the moment you can't just run install, since you first need to get the correct pytorch version installed - thus to get fastai-1.x installed choose one of the installation recipes below using your favourite python package manager.

If your system has a recent NVIDIA card with the correctly configured NVIDIA driver please follow the GPU installation instructions. Otherwise, the CPU-ones.

If you experience installation problems, please read about installation issues.

Conda Install

  • GPU

    conda install -c pytorch pytorch-nightly cuda92
    conda install -c fastai torchvision-nightly
    conda install -c fastai fastai
  • CPU

    conda install -c pytorch pytorch-nightly-cpu
    conda install -c fastai torchvision-nightly-cpu
    conda install -c fastai fastai

PyPI Install

  • GPU

    pip install torch_nightly -f
    pip install fastai
  • CPU

    pip install torch_nightly -f
    pip install fastai

NB: this set will also fetch torchvision-nightly, which supports torch-1.x.

Developer Install

First, follow the instructions above for either PyPi or Conda. Then uninstall the fastai package using the same package manager you used to install it, i.e. pip uninstall fastai or conda uninstall fastai, and then, replace it with a pip editable install.

git clone
cd fastai
pip install -e .[dev]

You can test that the build works by starting the jupyter notebook:

jupyter notebook

and executing an example notebook. For example load examples/tabular.ipynb and run it.

Alternatively, you can do a quick CLI test:

jupyter nbconvert --execute --ExecutePreprocessor.timeout=600 --to notebook examples/tabular.ipynb

If anything goes wrong please read and report installation issues.

Please refer to and for more details on how to contribute to the fastai project.

Installation Issues

If the installation process fails, first make sure your system is supported. And if the problem is still not addressed, please see this installation issues thread.

If you encounter installation problems with conda, make sure you have the latest conda client:

conda update conda

Sometimes you have to run the following instead:

conda install conda

Is My System Supported?

  1. Python: You need to have python 3.6 or higher

  2. CPU or GPU

    Please note that pytorch comes with its own CUDA libraries so you don't have to install NVIDIA's CUDA libraries if you don't need them for something else. If you have them installed already it doesn't matter which NVIDIA's CUDA version you have. Your system could have CUDA 9.0 libraries, and you can use pytorch build with cuda9.2 libraries without any problem, since pytorch is self-contained.

    The only requirement is that you have installed and configured the NVIDIA driver correctly. Usually you can test that by running nvidia-smi. While it's possible that this application is not available on your system, it's very likely that if it doesn't work, than your don't have your NVIDIA drivers configured properly. And remember that a reboot is always required after installing NVIDIA drivers.

  3. Operating System:

    Since fastai-1.0 relies on pytorch-1.0, you need to be able to install pytorch-1.0 first.

    As of this moment's pre-1.0.0 version (torch-nightly) supports:

    Platform GPU CPU
    linux binary binary
    mac source binary
    windows source source

    Legend: binary = can be installed directly, source = needs to be built from source.

    This will change once pytorch 1.0.0 is released and installable packages made available for your system, which could take some time after the official release is made. Please watch for updates here.

    If there is no pytorch preview conda or pip package available for your system, you may still be able to build it from source.

    Alternatively, please consider installing and using the very solid "0.7.x" version of fastai. Please see the instructions.


Copyright 2017 onwards,, Inc. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. A copy of the License is provided in the LICENSE file in this repository.

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