Pytorch installation issue under Anaconda

问题:

I followed the link here to install fastai library using pip install git+https://github.com/fastai/fastai.git

It gave me the following error message. These messages keep the same even I installed Pytorch successfully using conda install pytorch-cpu -c pytorch and pip3 install torchvision. What can be the reason?

Collecting torch<0.4 (from fastai==0.7.0)
  Using cached https://files.pythonhosted.org/packages/5f/e9/bac4204fe9cb1a002ec6140b47f51affda1655379fe302a1caef421f9846/torch-0.1.2.post1.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "C:\Users\shuxi\AppData\Local\Temp\pip-install-7sjptuad\torch\setup.py", line 11, in <module>
        raise RuntimeError(README)
    RuntimeError: PyTorch does not currently provide packages for PyPI (see status at https://github.com/pytorch/pytorch/issues/566).

    Please follow the instructions at http://pytorch.org/ to install with miniconda instead.


    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in C:\Users\shuxi\AppData\Local\Temp\pip-install-7sjptuad\torch\

回答1:

To fix this, do:

$ pip install --upgrade git+https://github.com/fastai/fastai.git

OR

$ pip install --no-cache-dir git+https://github.com/fastai/fastai.git

Your command probably failed because you have installed a old version of torch (0.1.2) some time ago. pip was not supported for torch install for that version and pip instead redirected the user to open pytorch.org in the browser. In your case, pip is reusing this cached package. --upgrade forces pip to choose latest version of all depending packages.