def __init__(selfdvarfactor)"""dvar is decision variable factor is factor that contains dvar and only parents of dvar ""self dvar dvar self factor factor vars [ for in factor variables if is not dvarfactor __init__(self,varsself values [none]*self size self decision_fun factordf(dvar,vars,[none]*self size def get_value(self,assignment)"""lazy implementationif savedreturn saved valueelse compute it""index self assignment_to_index(assignmentif self values[index]return self values[indexelsemax_val float("-inf"-infinity new_asst assignment copy(for elt in self dvar domainnew_asst[self dvarelt fac_val self factor get_value(new_asstif fac_val>max_valmax_val fac_val best_elt elt self values[indexmax_val self decision_fun values[indexbest_elt return max_val decision function is stored factor decnnetworks py -(continued class factordf(tabfactor)""" decision function""def __init__(self,dvarvarsvalues)tabstored __init__(self,vars,valuesself dvar dvar self name str(dvarused in printing here are some example queriesdecnnetworks py -(continued example queriesv, ve_dn(fire_dnoptimize()print(vfor df in pprint(df,"\ " ve_dn max_display_level if you want to show lots of detail , ve_dn(cheating_dnoptimize()print(vfor df in pprint(df,"\ "print decision functions version june