anchor.diff:  
   buildPythonPackage rec {
     pname = "transformers";
  -  version = "4.4.2";
  +  version = "4.12.2";
   
     src = fetchFromGitHub {
       owner = "huggingface";
       repo = pname;
       rev = "v${version}";
  -    hash = "sha256-kl1Z2FBo+yqVXUqLaUtet6IycmdcAtfydNTI4MNNrkc=";
  +    sha256 = "sha256-SndnMiXWiDW+E1G+WaUTVv3lySavJWF0nFDZLOxzObc=";
     };
   
     nativeBuildInputs = [ packaging ];
  
positive.code: , pythonOlder
  , cookiecutter
  , filelock
  , importlib-metadata
  , regex
  , requests
  , numpy
  , packaging
  , protobuf
  , sacremoses
  , tokenizers
  , tqdm
  
negative.code:   propagatedBuildInputs = [
      cookiecutter
      filelock
      huggingface-hub
      numpy
      protobuf
      pyyaml
      regex
      requests
      sacremoses
  