149 lines
3.9 KiB
Prolog
149 lines
3.9 KiB
Prolog
/*******************************************************
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Interface to Horus Lifted Solvers. Used by:
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- Lifted Variable Elimination
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- Lifted First-Order Belief Propagation
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********************************************************/
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:- module(clpbn_horus_lifted,
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[call_horus_lifted_solver/3,
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check_if_horus_lifted_solver_done/1,
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init_horus_lifted_solver/4,
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run_horus_lifted_solver/3,
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finalize_horus_lifted_solver/1
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]).
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:- use_module(horus,
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[cpp_create_lifted_network/3,
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cpp_set_parfactors_params/2,
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cpp_run_lifted_solver/3,
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cpp_free_lifted_network/1
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]).
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:- use_module(library('clpbn/display'),
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[clpbn_bind_vals/3]).
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:- use_module(library('clpbn/dists'),
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[get_dist_params/2]).
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:- use_module(library(pfl),
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[factor/6,
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skolem/2,
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get_pfl_parameters/2
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]).
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call_horus_lifted_solver([[]], _, _) :- !.
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call_horus_lifted_solver([QueryVars], AllVars, Output) :-
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init_horus_lifted_solver(_, AllVars, _, ParfactorList),
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run_horus_lifted_solver([QueryVars], LPs, ParfactorList),
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finalize_horus_lifted_solver(ParfactorList),
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clpbn_bind_vals([QueryVars], LPs, Output).
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init_horus_lifted_solver(_, AllAttVars, _, fove(ParfactorList, DistIds)) :-
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get_parfactors(Parfactors),
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get_dist_ids(Parfactors, DistIds0),
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sort(DistIds0, DistIds),
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get_observed_vars(AllAttVars, ObservedVars),
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%writeln(parfactors:Parfactors:'\n'),
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%writeln(evidence:ObservedVars:'\n'),
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cpp_create_lifted_network(Parfactors,ObservedVars,ParfactorList).
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:- table get_parfactors/1.
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%
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% enumerate all parfactors and enumerate their domain as tuples.
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%
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% output is list of pf(
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% Id: an unique number
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% Ks: a list of keys, also known as the pf formula [a(X),b(Y),c(X,Y)]
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% Vs: the list of free variables [X,Y]
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% Phi: the table following usual CLP(BN) convention
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% Tuples: ground bindings for variables in Vs, of the form [fv(x,y)]
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%
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get_parfactors(Factors) :-
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findall(F, is_factor(F), Factors).
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is_factor(pf(Id, Ks, Rs, Phi, Tuples)) :-
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factor(_Type, Id, Ks, Vs, Table, Constraints),
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get_ranges(Ks,Rs),
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Table \= avg,
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gen_table(Table, Phi),
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all_tuples(Constraints, Vs, Tuples).
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get_ranges([],[]).
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get_ranges(K.Ks, Range.Rs) :- !,
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skolem(K,Domain),
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length(Domain,Range),
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get_ranges(Ks, Rs).
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gen_table(Table, Phi) :-
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( is_list(Table)
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->
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Phi = Table
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;
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call(user:Table, Phi)
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).
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all_tuples(Constraints, Tuple, Tuples) :-
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setof(Tuple, Constraints^run(Constraints), Tuples).
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run([]).
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run(Goal.Constraints) :-
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user:Goal,
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run(Constraints).
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get_dist_ids([], []).
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get_dist_ids(pf(Id, _, _, _, _).Parfactors, Id.DistIds) :-
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get_dist_ids(Parfactors, DistIds).
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get_observed_vars([], []).
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get_observed_vars(V.AllAttVars, [K:E|ObservedVars]) :-
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clpbn:get_atts(V,[key(K)]),
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( clpbn:get_atts(V,[evidence(E)]) ; pfl:evidence(K,E) ), !,
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get_observed_vars(AllAttVars, ObservedVars).
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get_observed_vars(V.AllAttVars, ObservedVars) :-
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clpbn:get_atts(V,[key(_K)]), !,
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get_observed_vars(AllAttVars, ObservedVars).
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get_query_vars([], []).
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get_query_vars(E1.L1, E2.L2) :-
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get_query_vars_2(E1,E2),
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get_query_vars(L1, L2).
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get_query_vars_2([], []).
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get_query_vars_2(V.AttVars, [RV|RVs]) :-
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clpbn:get_atts(V,[key(RV)]), !,
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get_query_vars_2(AttVars, RVs).
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get_dists_parameters([], []).
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get_dists_parameters([Id|Ids], [dist(Id, Params)|DistsInfo]) :-
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get_pfl_parameters(Id, Params),
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get_dists_parameters(Ids, DistsInfo).
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run_horus_lifted_solver(QueryVarsAtts, Solutions, fove(ParfactorList, DistIds)) :-
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get_query_vars(QueryVarsAtts, QueryVars),
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%writeln(queryVars:QueryVars), writeln(''),
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get_dists_parameters(DistIds, DistsParams),
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%writeln(dists:DistsParams), writeln(''),
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cpp_set_parfactors_params(ParfactorList, DistsParams),
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cpp_run_lifted_solver(ParfactorList, QueryVars, Solutions).
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finalize_horus_lifted_solver(fove(ParfactorList, _)) :-
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cpp_free_lifted_network(ParfactorList).
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