anchor.diff:  in buildPythonPackage rec {
     pname = "pytorch";
     # Don't forget to update pytorch-bin to the same version.
  -  version = "1.6.0";
  +  version = "1.7.0";
   
     disabled = !isPy3k;
   
  
positive.code:   # dependencies for torch.utils.tensorboard
    pillow, six, future, tensorflow-tensorboard, protobuf,
  
    utillinux, which, isPy3k }:
  
  assert !openMPISupport || openmpi != null;
  
  
negative.code:     click
      numpy
      pyyaml
      typing-extensions
      # the following are required for tensorboard support
      pillow six future tensorflow-tensorboard protobuf
    ] ++ lib.optionals openMPISupport [ openmpi ]
      ++ lib.optionals (pythonOlder "3.7") [ dataclasses ];
  
    checkInputs = [ hypothesis ninja psutil ];
  
  