langchain/document_loaders/pdf.py/PDFMinerLoader/__init__
class PDFMinerLoader:    def __init__(self, file_path: str) -> None:
        """Initialize with file path."""
        try:
            from pdfminer.high_level import extract_text  # noqa:F401
        except ImportError:
            raise ImportError(
                "`pdfminer` package not found, please install it with "
                "`pip install pdfminer.six`"
            )

        super().__init__(file_path)
        self.parser = PDFMinerParser()