anchor.diff:  
   buildPythonPackage rec {
     pname = "transformers";
  -  version = "3.3.1";
  +  version = "3.4.0";
   
     src = fetchFromGitHub {
       owner = "huggingface";
       repo = pname;
       rev = "v${version}";
  -    sha256 = "1j9nzhl0zw5z9rnvzfih7v6bax353rxp05b3f0cvkii3b5dbkc2j";
  +    sha256 = "1v09gryxsg57d2cjwagna1535m8mbxlazdbhsww210lxa818m5qj";
     };
   
     propagatedBuildInputs = [
  -    boto3
       filelock
       numpy
  +    protobuf
       regex
       requests
       sacremoses
  
positive.code:     pytestCheckHook
      timeout-decorator
    ];
  
    postPatch = ''
      substituteInPlace setup.py \
        --replace "tokenizers == 0.8.1.rc2" "tokenizers>=0.8"
    '';
  
    preCheck = ''
      export HOME="$TMPDIR"
  
negative.code: , requests
  , numpy
  , parameterized
  , protobuf
  , sacremoses
  , sentencepiece
  , timeout-decorator
  