How to install fastai 2 on Google Colab

Part 1 (2020)
1

Hey, I have 5 questions about installing fastai:

  1. What is the best way, to install fastai version 2 on Google Colab?
  2. How can I install the latest version and how can I specify a specific fastai version?
  3. How do I know what the latest version is?

I was very confused to see this:

!pip install fastai==2.0.19
!pip install fastai2==0.0.30
!pip install fastcore==1.3.1
  1. Why should I ever install both version 1 and version 2, respectivley (see example above)?
  2. Why should I install fastcore? Is it not included in fastai?
1 Like
2

Hey,

just do the following and you are good to go:

pip install -Uq fastai

if you want to specify a specific version

pip install -Uq fastai==2.0.19

you don’t have to install fastcore or fastai2.

Florian

3 Likes
3

Thanks a lot Florian!

What is the difference between

pip install  fastai

ànd

pip install -Uq fastai
4

you can check the parameters with pip install --help

-U, --upgrade               Upgrade all specified packages to the newest available version. The handling of
                              dependencies depends on the upgrade-strategy used.

-q, --quiet                 Give less output. Option is additive, and can be
                              used up to 3 times (corresponding to WARNING,
                              ERROR, and CRITICAL logging levels).

So -U makes sure the package is upgraded if its already installed (e.g. on Colab fastai v1 is still the default version - you’ll have to upgrade to use v2) and -q surpresses the output of pip.

Florian

3 Likes
5

@florianl installation is pretty easy however there is conflict between cuda driver fastai2 needs for its pytorch and one the one installed on colab.

6

This should be solved by now. But if not, install with Light the Torch:

2 Likes
7

i executed above commands and face below issue

      1 from . import models
      2 from ..basics import *
----> 3 from ..callback.all import *
      4 from .augment import *
      5 from .core import *

ModuleNotFoundError: No module named 'fastai.callback.all'; 'fastai.callback' is not a package
8

restarting the colab after installation worked.