{"record":{"id":"cd4816a64a635b8e","repo":"huggingface/transformers","slug":"some-keys-are-not-used-by-the-hfargumentparser-s","errorCode":null,"errorMessage":"Some keys are not used by the HfArgumentParser: {sorted(unused_keys)}","messagePattern":"Some keys are not used by the HfArgumentParser: (.+?)","errorType":"exception","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"src/transformers/hf_argparser.py","lineNumber":383,"sourceCode":"                dict containing config values\n            allow_extra_keys (`bool`, *optional*, defaults to `False`):\n                Defaults to False. If False, will raise an exception if the dict contains keys that are not parsed.\n\n        Returns:\n            Tuple consisting of:\n\n                - the dataclass instances in the same order as they were passed to the initializer.\n        \"\"\"\n        unused_keys = set(args.keys())\n        outputs = []\n        for dtype in self.dataclass_types:\n            keys = {f.name for f in dataclasses.fields(dtype) if f.init}\n            inputs = {k: v for k, v in args.items() if k in keys}\n            unused_keys.difference_update(inputs.keys())\n            obj = dtype(**inputs)\n            outputs.append(obj)\n        if not allow_extra_keys and unused_keys:\n            raise ValueError(f\"Some keys are not used by the HfArgumentParser: {sorted(unused_keys)}\")\n        return tuple(outputs)\n\n    def parse_json_file(self, json_file: str | os.PathLike, allow_extra_keys: bool = False) -> tuple[DataClass, ...]:\n        \"\"\"\n        Alternative helper method that does not use `argparse` at all, instead loading a json file and populating the\n        dataclass types.\n\n        Args:\n            json_file (`str` or `os.PathLike`):\n                File name of the json file to parse\n            allow_extra_keys (`bool`, *optional*, defaults to `False`):\n                Defaults to False. If False, will raise an exception if the json file contains keys that are not\n                parsed.\n\n        Returns:\n            Tuple consisting of:\n\n                - the dataclass instances in the same order as they were passed to the initializer.","sourceCodeStart":365,"sourceCodeEnd":401,"githubUrl":"https://github.com/huggingface/transformers/blob/a597f974857b3d92939971296bc0deb93d33d780/src/transformers/hf_argparser.py#L365-L401","documentation":"Error \"Some keys are not used by the HfArgumentParser: {sorted(unused_keys)}\" thrown in huggingface/transformers.","triggerScenarios":"Raised in HfArgumentParser.parse_json_file/parse_dict when the provided keys do not match any dataclass field.","commonSituations":"Stale or misspelled keys in a training JSON config file that no longer correspond to dataclass fields.","solutions":["Remove unused keys from the JSON/dict, or add the corresponding dataclass fields.","Verify key spellings against the dataclass definition."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"a597f974857b3d92939971296bc0deb93d33d780","analyzedAt":"2026-08-14T18:24:08.354Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}