How to use the delve.writers.CSVWriter function in delve

def add_scalar(self, name, value, **kwargs):
        if 'covariance' in name:
            return
        self.writer.add_scalar(name, value)

    def add_scalars(self, prefix, value_dict, **kwargs):
        self.writer.add_scalars(prefix, value_dict)

    def save(self):
        pass

    def close(self):
        self.writer.close()


class CSVandPlottingWriter(CSVWriter):

    def __init__(self, savepath: str, plot_manipulation_func: Callable[[plt.Axes], plt.Axes] = None, **kwargs):
        """
        This writer produces CSV files and plots.
        :param savepath: Path to store plots and CSV files
        :param plot_manipulation_func: A function mapping an axis object to an axis object by
                                       using pyplot code.
        :param kwargs:
        """
        super(CSVandPlottingWriter, self).__init__(savepath)
        self.plot_man_func = plot_manipulation_func if plot_manipulation_func is not None else lambda x: x
        self.primary_metric = None if not 'primary_metric' in kwargs else kwargs['primary_metric']
        self.fontsize = 16 if not 'fontsize' in kwargs else kwargs['fontsize']
        self.figsize = None if not 'figsize' in kwargs else kwargs['figsize']
        self.epoch_counter: int = 0
        self.stats = []

def __init__(self, savepath: str, **kwargs):
        """
        This writer produces a csv file with all saturation values.
        The csv-file is overwritten with
        an updated version every time save() is called.
        :param savepath: CSV file path
        """
        super(CSVWriter, self).__init__()
        self.value_dict = {}
        self.savepath = savepath