title: "no module named torch". But installed pytorch 1.3.0 with conda in Ubuntu 18.04.02 Server Edition
body: <p>installed pytorch with conda :</p>
  
  <pre><code>(base) (3.8.0/envs/my_virtual_env-3.8.0) marco@pc:~/facenet_pytorch/examples$ conda install  
  pytorch torchvision cpuonly -c pytorch
  Collecting package metadata (current_repodata.json): done
  Solving environment: done
  
  # All requested packages already installed.
  </code></pre>
  
  <p>I updated conda:</p>
  
  <pre><code>(base) (3.8.0/envs/my_virtual_env-3.8.0) marco@pc:~/facenet_pytorch/examples$ conda update 
  conda
  Collecting package metadata (current_repodata.json): done
  Solving environment: done
  
  # All requested packages already installed.
  </code></pre>
  
  <p>Installed mkl=2019 :   </p>
  
  <pre><code>(base) (3.8.0/envs/my_virtual_env-3.8.0) marco@pc:~/facenet_pytorch/examples$ conda install  
  mkl=2019
  Collecting package metadata (current_repodata.json): done
  Solving environment: done
  
  # All requested packages already installed.
  
  (base) (3.8.0/envs/my_virtual_env-3.8.0) marco@pc:~/facenet_pytorch/examples$ conda list | grep 
  torch
  cpuonly                   1.0                           0    pytorch
  facenet-pytorch           0.1.0                    pypi_0    pypi
  pytorch                   1.3.0               py3.7_cpu_0  [cpuonly]  pytorch
  torchfile                 0.1.0                    pypi_0    pypi
  torchvision               0.4.1                  py37_cpu  [cpuonly]  pytorch
  </code></pre>
  
  <p>But it still says "no module torch" :  </p>
  
  <pre><code>(base) (3.8.0/envs/my_virtual_env-3.8.0) marco@pc:~/facenet_pytorch/examples$ python3
  Python 3.8.0 (default, Oct 30 2019, 16:20:23) 
  [GCC 7.4.0] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import torch
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  ModuleNotFoundError: No module named 'torch'
  &gt;&gt;&gt; 
  </code></pre>
  
  <p>I discovered that the problem appears only with python 3.8.0 version</p>
  
  <pre><code>(base) marco@pc:~/facenet_pytorch$ python3
  Python 3.7.3 (default, Mar 27 2019, 22:11:17) 
  [GCC 7.3.0] :: Anaconda, Inc. on linux
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import torch
  &gt;&gt;&gt; 
  </code></pre>
  
  <p>Ubuntu 18.04.02 Server Edition</p>
  
  <p>Or, may be, it's just a matter of python environments, as you said.
  But I do not understand why just activating conda environment, with "conda activate", it doesn't work</p>
  
  <p>Marco</p>