# all_df_joind = all_df.apply(lambda x: list(x))
        # all_df_joind = all_df.apply(np.append)
        # all_df_joind = all_df_gb.applymap(lambda x: list(x))
        # all_df_joind = all_df_gb.applymap(lambda x: np.array2string(x, separator=' '))
        # all_df_combine = all_df_joind.apply(np.sum, axis=1).to_frame()
        # all_df_combine.columns = 'x_text'