>>> uc = UnifiedClassification(func='logisticregression',
                               multi_class=True,
                               massive=True,
                               max_iter=10,
                               group_params={'Group_1' : {'solver' : 'auto'}})
>>> uc.fit(data=df,
           key='ID',
           features=["OUTLOOK" ,"TEMP", "HUMIDITY","WINDY"],
           label="CLASS",
           group_key="GROUP_ID",
           background_size=4,
           group_params={'Group_1' : {'background_random_state' : 2}})