anchor.diff:  , nbconvert
   , jupyter
   , chainer
  +, parameterized
   , pytorch
   , mxnet
   , tensorflow
  
positive.code:     jupyter
      # For backend tests
      chainer
      pytorch
      mxnet
      tensorflow
  
negative.code: 
  buildPythonPackage rec {
    pname = "einops";
    version = "0.4.1";
  
    src = fetchFromGitHub {
      owner = "arogozhnikov";
      repo = pname;
      rev = "v${version}";
      hash = "sha256-n4R4lcRimuOncisCTs2zJWPlqZ+W2yPkvkWAnx4R91s=";
    };
  
    checkInputs = [
  