anchor.diff:  
     postPatch = ''
       substituteInPlace setup.py \
  -      --replace "tokenizers == 0.9.3" "tokenizers" \
  -      --replace "sentencepiece == 0.1.91" "sentencepiece"
  +      --replace "tokenizers == 0.9.4" "tokenizers"
     '';
   
     preCheck = ''
  
positive.code: , parameterized
  , protobuf
  , sacremoses
  , sentencepiece
  , timeout-decorator
  , tokenizers
  , tqdm
  
negative.code: 
  buildPythonPackage rec {
    pname = "transformers";
    version = "4.0.0";
  
    src = fetchFromGitHub {
      owner = "huggingface";
      repo = pname;
      rev = "v${version}";
      sha256 = "17djq32pq8d6vqip7i9pda0ldigmzckbbcd278llmpxdriqd4llg";
    };
  
    propagatedBuildInputs = [
      cookiecutter
      filelock
      numpy
      protobuf
      regex
      requests
      sacremoses
      tokenizers
      tqdm
    ];
  