Fastai V2 with Google Colab

Part 1 (2019) Advanced (Part 1 v3)
#1

I have been using Fastai v2, development version, in Google Colab for several months. 2 days ago, I moved to the released version of Fastai V2. I have encountered two problems:

  1. The following statement fails with a 'No module named 'fastai.vision.all"
    from fastai.vision.all import *

  2. The following statement also fails:
    ds_source = untar_data(URLs.PASCAL_2007)

    AssertionError Traceback (most recent call last)
    in ()
    ----> 1 ds_source = untar_data(URLs.PASCAL_2007)

    /usr/local/lib/python3.6/dist-packages/fastai/datasets.py in untar_data(url, fname, dest, data, force_download, verbose)
    233 fname = download_data(url, fname=fname, data=data)
    234 if url in _checks:
    –> 235 assert _check_file(fname) == _checks[url], f"Downloaded file {fname} does not match checksum expected! Remove that file from {Config().data_archive_path()} and try your code again."
    236 if verbose: print(’.tgz file downloaded. Extracting the contents…’)
    237 tarfile.open(fname, ‘r:gz’).extractall(dest.parent)

    AssertionError: Downloaded file /root/.fastai/data/pascal_2007.tgz does not match checksum expected! Remove that file from /root/.fastai/data and try your code again.

I have waited 48 hours before re-starting the notebook in the hope the folders would flush out. I also tried to fix the problem by renaming the existing folder containing pascal_2007.tgz and creating a new folder, but the problem persists in all cases.

1 Like
#2

Did you make sure to upgrade the version? Colab comes preinstalled with the old fastai version so just doing pip install fastai won’t do anything. You need a --upgrade along with it

3 Likes
#3

Thank you for responding so quickly. I checked the Fastai version with “!pip show fastai”
the results is:

Name: fastai Version: 1.0.61 Summary: fastai makes deep learning with PyTorch faster, more accurate, and easier Home-page: https://github.com/fastai/fastai Author: Jeremy Howard Author-email: [info@fast.ai](mailto:info@fast.ai) License: Apache Software License 2.0 Location: /usr/local/lib/python3.6/dist-packages Requires: dataclasses, spacy, matplotlib, torch, torchvision, pandas, scipy, fastprogress, packaging, numpy, beautifulsoup4, pyyaml, requests, numexpr, Pillow, bottleneck, nvidia-ml-py3 Required-by: Torch Version: 1.6.0+cu101

Isn’t Version 1.0.61 the official release version? Thanks

1 Like
#4

No, it’s 2.0.0. You have the old version. See my answer above to update it

#5

Thanks very much for your help

#6

Gee thanks for providing this answer. As simple as it is, I was entirely lost thanks for clearing this up lmao.

#7

I experienced the same issue and !pip install fastai --upgrade fixed the problem.

1 Like
#8

Thanks you for the reply! Seems like I had the same problem :smile:

#9

thank you so much i had same problem