Method update

qlib/data/cache.py:447–463

Update dataset cache to latest calendar. Override this method to define how to update dataset cache corresponding to users' own cache mechanism. Parameters ---------- cache_uri : str or Path the complete uri of dataset cache file (include dir path).

(self, cache_uri: Union[str, Path], freq: str = "day")

        )

    def update(self, cache_uri: Union[str, Path], freq: str = "day"):
        """Update dataset cache to latest calendar.

        Override this method to define how to update dataset cache corresponding to users' own cache mechanism.

        Parameters
        ----------
        cache_uri : str or Path
            the complete uri of dataset cache file (include dir path).
        freq : str

        Returns
        -------
        int
            0(successful update)/ 1(no need to update)/ 2(update failure)
        """
        raise NotImplementedError("Implement this method if you want to make expression cache up to date")

    @staticmethod
    def cache_to_origin_data(data, fields):