title: Incompletable PyTorch with any CUDA version (module 'torch' has no attribute 'cuda')
body: <p>I have NVidia 1080TI, Ubuntu x64, and Python 3.6.9 installed.
  I was trying to launch PyTorch with command</p>
  <pre><code>import torch
  print(torch.cuda.is_available)
  </code></pre>
  <p>and expected to see 'True' but met the error:</p>
  <pre><code>AttributeError: module 'torch' has no attribute 'cuda'
  </code></pre>
  <p>I tried to update PyTorch and install the last version 1.7.0 with CUDA 11.0 support. After that, I noticed some version discrepancies. <code>nvidia-smi</code> shows CUDA version 11.0 but <code>nvcc -V</code> shows 9.1. Also, I used <code>cat /usr/local/cuda/version.txt</code> to check CUDA version but got the error: <code>cat: /usr/local/cuda/version.txt: No such file or directory</code>
  I installed CUDA driver 450.33 after fully nvidia purging but the error remains and <code>nvcc -V</code> still shows 9.1 version (after reboot also).<br />
  One more option I addressed to is conda installation but it didn't help.
  What I can do to resolve the problem?</p>