    def read(self, file_path: DatasetReaderInput) -> Iterator[Instance]:
        """
        Returns an iterator of instances that can be read from the file path.
        """
        for instance in self._multi_worker_islice(self._read(file_path)):  # type: ignore
            if self._worker_info is None:
                # If not running in a subprocess, it's safe to apply the token_indexers right away.
                self.apply_token_indexers(instance)
            yield instance
Returns an iterator of instances that can be read from the file path.
allennlp/data/dataset_readers/dataset_reader.py