    def opena(
        path: str,
        mode: str = "r",
        buffering: int = -1,
        encoding: Optional[str] = None,
        errors: Optional[str] = None,
        newline: Optional[str] = None,
    ):
        """
        Return file descriptor with asynchronous write operations.
        """
        global IOPathManager
        if not IOPathManager:
            logging.info("ioPath is initializing PathManager.")
            try:
                from iopath.common.file_io import PathManager

                IOPathManager = PathManager()
            except Exception:
                logging.exception("Failed to initialize ioPath PathManager object.")
        return IOPathManager.opena(
            path=path,
            mode=mode,
            buffering=buffering,
            encoding=encoding,
            errors=errors,
            newline=newline,
        )
Return file descriptor with asynchronous write operations.
fairseq/file_io.py