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 concat_fn(cls, dataframes, **kwargs):
        import cudf
        return cudf.concat(dataframes, **kwargs)