anchor.diff:  , stdenv
   , fetchFromGitHub
   , boto3
  +, cookiecutter
   , filelock
   , regex
   , requests
  
positive.code: 
    postPatch = ''
      substituteInPlace setup.py \
        --replace "tokenizers == 0.9.3" "tokenizers" \
        --replace "sentencepiece == 0.1.91" "sentencepiece"
    '';
  
    preCheck = ''
  
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
    ];
  