title: Why `torch.cuda.is_available()` returns False even after installing pytorch with cuda?
body: <p>On a Windows 10 PC with an NVidia GeForce 820M
  I installed CUDA 9.2 and cudnn 7.1 successfully,
  and then installed PyTorch using the instructions at pytorch.org:</p>
  <pre><code>pip install torch==1.4.0+cu92 torchvision==0.5.0+cu92 -f https://download.pytorch.org/whl/torch_stable.html
  </code></pre>
  <p>But I get:</p>
  <pre><code>&gt;&gt;&gt; import torch
  &gt;&gt;&gt; torch.cuda.is_available()
  False
  </code></pre>