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 serialize(self, value, display=False):
        if value is not None and display:
            return "********"
        return super().serialize(value, display)