def adata():
    adata = ad.AnnData(np.zeros((100, 100)))
    adata.obsm["o"] = np.zeros((100, 50))
    adata.varm["o"] = np.zeros((100, 50))
    return adata
def start_date(self):
        """ Returns a date object of the todo's start date. """
        return self.get_date(config().tag_start())