anchor.diff:    pname = "torchgpipe";
     version = "0.0.7";
   
  -  disabled = isPy27;
  +  disabled = pythonOlder "3.6";
   
     src = fetchFromGitHub {
       owner = "kakaobrain";
  
positive.code: { lib
  , buildPythonPackage
  , fetchFromGitHub
  , isPy27
  , pytest-runner
  , pytestCheckHook
  , torch
  }:
  
negative.code:     sha256 = "0ki0njhmz1i3pkpr3y6h6ac7p5qh1kih06mknc2s18mfw34f2l55";
    };
  
    postPatch = ''
      substituteInPlace setup.py \
        --replace "'pytest-runner'" ""
    '';
  
    propagatedBuildInputs = [ torch ];
  
    checkInputs = [ pytestCheckHook ];
    disabledTests = [
      "test_inplace_on_requires_grad"
      "test_input_requiring_grad"
  