title: conda does not install old version of pytorch
body: <p>I'm trying to install Pytorch 1.7 on a remote cluster using anaconda.</p>
  <p>I have cloned the base environment from the anaconda module installed on remote:</p>
  <pre><code>module load anaconda
  conda activate
  conda create --clone base --name myenv
  </code></pre>
  <p>I have then done:</p>
  <pre><code>conda install pytorch==1.7.1 cudatoolkit=11.0 -c pytorch 
  </code></pre>
  <p>as recommended in the Pytorch documentation. I  get an error message,</p>
  <pre><code>PackagesNotFoundError: The following packages are not available from current channels:
  
    - pytorch==1.7.1
  </code></pre>
  <p>On my personal laptop I can install pytorch 1.7 without issues using conda. I have conda 4.11.0 on my laptop and 4.9.2 on remote; the version of anaconda is the same. I cannot upgrade conda to 4.11 on remote as there are inconsistencies.</p>
  <p>I have also tried to install my own version of anaconda from <a href="https://repo.anaconda.com/archive/Anaconda3-2021.05-Linux-ppc64le.sh**" rel="nofollow noreferrer">https://repo.anaconda.com/archive/Anaconda3-2021.05-Linux-ppc64le.sh**</a>, with matched version of anaconda and conda to those of my laptop. Still no success at installing pytorch 1.7 with the command above.</p>
  <p>Do you have any suggestions?</p>
  <p>Thanks!</p>
  <p>**the ppc64le extension is apparently the correct one, any x86 version refuses to install, although it's unclear to me why that is so..</p>