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import json
import datasets


logger = datasets.logging.get_logger(__name__)
_DESCRIPTION = """T-Rex dataset."""
_NAME = "t_rex"
_VERSION = "0.0.2"
_CITATION = """
@inproceedings{elsahar2018t,
  title={T-rex: A large scale alignment of natural language with knowledge base triples},
  author={Elsahar, Hady and Vougiouklis, Pavlos and Remaci, Arslen and Gravier, Christophe and Hare, Jonathon and Laforest, Frederique and Simperl, Elena},
  booktitle={Proceedings of the Eleventh International Conference on Language Resources and Evaluation (LREC 2018)},
  year={2018}
} 
"""

_HOME_PAGE = "https://github.com/asahi417/relbert"
_URL = f'https://huggingface.co/datasets/relbert/{_NAME}/resolve/main/data'
_TYPES = ["raw", "filter"]
_URLS = {i: {
    str(datasets.Split.TRAIN): [f'{_URL}/t_rex.{i}.train.jsonl'],
    str(datasets.Split.VALIDATION): [f'{_URL}/t_rex.{i}.validation.jsonl'],
    str(datasets.Split.TEST): [f'{_URL}/t_rex.{i}.test.jsonl']
} for i in _TYPES}


class TREXConfig(datasets.BuilderConfig):
    """BuilderConfig"""

    def __init__(self, **kwargs):
        """BuilderConfig.
        Args:
          **kwargs: keyword arguments forwarded to super.
        """
        super(TREXConfig, self).__init__(**kwargs)


class TREX(datasets.GeneratorBasedBuilder):
    """Dataset."""

    BUILDER_CONFIGS = [
        TREXConfig(name=i, version=datasets.Version(_VERSION), description=_DESCRIPTION)
        for i in sorted(_TYPES)
    ]

    def _split_generators(self, dl_manager):
        downloaded_file = dl_manager.download_and_extract(_URLS[self.config.name])
        return [datasets.SplitGenerator(name=i, gen_kwargs={"filepaths": downloaded_file[str(i)]})
                for i in [datasets.Split.TRAIN, datasets.Split.VALIDATION, datasets.Split.TEST]]

    def _generate_examples(self, filepaths):
        _key = 0
        for filepath in filepaths:
            logger.info(f"generating examples from = {filepath}")
            with open(filepath, encoding="utf-8") as f:
                _list = [i for i in f.read().split('\n') if len(i) > 0]
                for i in _list:
                    data = json.loads(i)
                    yield _key, data
                    _key += 1

    def _info(self):
        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=datasets.Features(
                {
                    "title": datasets.Value("string"),
                    "text": datasets.Value("string"),
                    "predicate": datasets.Value("string"),
                    "object": datasets.Value("string"),
                    "subject": datasets.Value("string")
                }
            ),
            supervised_keys=None,
            homepage=_HOME_PAGE,
            citation=_CITATION,
        )