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moving parameters to theory_pb

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2014-01-01 20:00:10 -08:00
parent 4027de42f6
commit c5b82796ca
15 changed files with 159 additions and 162 deletions
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146
src/opt/fu_malik.cpp
View file

@ -55,8 +55,6 @@ namespace opt {
unsigned m_lower;
model_ref m_model;
bool m_use_new_bv_solver;
imp(ast_manager& m, opt_solver& s, expr_ref_vector const& soft):
m(m),
m_opt_solver(s),
@ -65,8 +63,7 @@ namespace opt {
m_orig_soft(soft),
m_aux(m),
m_upper(0),
m_lower(0),
m_use_new_bv_solver(false)
m_lower(0)
{
m_upper = m_soft.size() + 1;
m_assignment.resize(m_soft.size(), false);
@ -118,48 +115,6 @@ namespace opt {
}
}
void quick_explain(expr_ref_vector const& assumptions, expr_ref_vector & literals, bool has_set, expr_set & core) {
if (has_set && s().check_sat(assumptions.size(), assumptions.c_ptr()) == l_false) {
core.reset();
return;
}
SASSERT(!literals.empty());
if (literals.size() == 1) {
core.reset();
core.insert(literals[0].get());
return;
}
unsigned mid = literals.size()/2;
expr_ref_vector ls1(m), ls2(m);
ls1.append(mid, literals.c_ptr());
ls2.append(literals.size()-mid, literals.c_ptr() + mid);
#if Z3DEBUG
expr_ref_vector ls(m);
ls.append(ls1);
ls.append(ls2);
SASSERT(ls.size() == literals.size());
for (unsigned i = 0; i < literals.size(); ++i) {
SASSERT(ls[i].get() == literals[i].get());
}
#endif
expr_ref_vector as1(m);
as1.append(assumptions);
as1.append(ls1);
expr_set core2;
quick_explain(as1, ls2, !ls1.empty(), core2);
expr_ref_vector as2(m), cs2(m);
as2.append(assumptions);
set2vector(core2, cs2);
as2.append(cs2);
expr_set core1;
quick_explain(as2, ls1, !core2.empty(), core1);
set_union(core1, core2, core);
}
lbool step() {
IF_VERBOSE(1, verbose_stream() << "(opt.max_sat step " << m_soft.size() + 2 - m_upper << ")\n";);
expr_ref_vector assumptions(m), block_vars(m);
@ -172,38 +127,7 @@ namespace opt {
}
ptr_vector<expr> core;
if (m_use_new_bv_solver) {
// Binary search for minimal unsat core
expr_set core_set;
expr_ref_vector empty(m);
quick_explain(empty, assumptions, true, core_set);
expr_set::iterator it = core_set.begin(), end = core_set.end();
for (; it != end; ++it) {
core.push_back(*it);
}
//// Forward linear search for unsat core
//unsigned i = 0;
//while (s().check_sat(core.size(), core.c_ptr()) != l_false) {
// IF_VERBOSE(0, verbose_stream() << "(opt.max_sat get-unsat-core round " << i << ")\n";);
// core.push_back(assumptions[i].get());
// ++i;
//}
//// Backward linear search for unsat core
//unsigned i = 0;
//core.append(assumptions.size(), assumptions.c_ptr());
//while (!core.empty() && s().check_sat(core.size()-1, core.c_ptr()) == l_false) {
// IF_VERBOSE(0, verbose_stream() << "(opt.max_sat get-unsat-core round " << i << ")\n";);
// core.pop_back();
// ++i;
//}
IF_VERBOSE(1, verbose_stream() << "(opt.max_sat unsat-core of size " << core.size() << ")\n";);
}
else {
s().get_unsat_core(core);
}
s().get_unsat_core(core);
SASSERT(!core.empty());
@ -266,23 +190,6 @@ namespace opt {
for (unsigned i = 0; i < num_assertions; ++i) {
g.assert_expr(current_solver.get_assertion(i));
}
#if 0
// TBD: this leaks references somehow
probe_ref p = mk_is_qfbv_probe();
bool all_bv = (*p)(g).is_true();
if (all_bv) {
smt::context & ctx = m_opt_solver.get_context();
tactic_ref t = mk_qfbv_tactic(m, ctx.get_params());
// The new SAT solver hasn't supported unsat core yet
m_s = mk_tactic2solver(m, t.get());
SASSERT(m_s != &m_opt_solver);
for (unsigned i = 0; i < num_assertions; ++i) {
m_s->assert_expr(current_solver.get_assertion(i));
}
m_use_new_bv_solver = true;
IF_VERBOSE(1, verbose_stream() << "Force to use the new BV solver." << std::endl;);
}
#endif
}
// TBD: bug when cancel flag is set, fu_malik returns is_sat == l_true instead of l_undef
@ -371,10 +278,51 @@ namespace opt {
void fu_malik::updt_params(params_ref& p) {
// no-op
}
};
#if 0
void quick_explain(expr_ref_vector const& assumptions, expr_ref_vector & literals, bool has_set, expr_set & core) {
if (has_set && s().check_sat(assumptions.size(), assumptions.c_ptr()) == l_false) {
core.reset();
return;
}
SASSERT(!literals.empty());
if (literals.size() == 1) {
core.reset();
core.insert(literals[0].get());
return;
}
unsigned mid = literals.size()/2;
expr_ref_vector ls1(m), ls2(m);
ls1.append(mid, literals.c_ptr());
ls2.append(literals.size()-mid, literals.c_ptr() + mid);
#if Z3DEBUG
expr_ref_vector ls(m);
ls.append(ls1);
ls.append(ls2);
SASSERT(ls.size() == literals.size());
for (unsigned i = 0; i < literals.size(); ++i) {
SASSERT(ls[i].get() == literals[i].get());
}
#endif
expr_ref_vector as1(m);
as1.append(assumptions);
as1.append(ls1);
expr_set core2;
quick_explain(as1, ls2, !ls1.empty(), core2);
expr_ref_vector as2(m), cs2(m);
as2.append(assumptions);
set2vector(core2, cs2);
as2.append(cs2);
expr_set core1;
quick_explain(as2, ls1, !core2.empty(), core1);
set_union(core1, core2, core);
}
#endif

7
src/opt/opt_solver.cpp
View file

@ -54,13 +54,6 @@ namespace opt {
m_dump_benchmarks = p.dump_benchmarks();
m_params.updt_params(_p);
m_context.updt_params(_p);
smt::theory_id th_id = m.get_family_id("pb");
smt::theory* _th = get_context().get_theory(th_id);
if (_th) {
smt::theory_pb* th = dynamic_cast<smt::theory_pb*>(_th);
th->set_conflict_frequency(p.pb_conflict_freq());
th->set_learn_complements(p.pb_learn_comp());
}
}
void opt_solver::collect_param_descrs(param_descrs & r) {

1
src/opt/optsmt.cpp
View file

@ -247,6 +247,7 @@ namespace opt {
inf_eps obj = m_s->get_objective_value(obj_index);
if (obj > m_lower[obj_index]) {
m_lower[obj_index] = obj;
IF_VERBOSE(1, verbose_stream() << "(optsmt lower bound: " << obj << ")\n";);
for (unsigned i = obj_index+1; i < m_vars.size(); ++i) {
m_s->maximize_objective(i);
m_lower[i] = m_s->get_objective_value(i);

17
src/opt/plan.txt
View file

@ -1,17 +0,0 @@
Create file with command-line extensions.
Similar to muz\fp\dl_cmds:
- Add command (minimize <term>)
- Add command (assert-weighted <expr> <weight> [:id]) the weight is a positive
rational number, 1 can be handled as a special case sd not weighted SAT,
but as ordinary MAXSAT (e.g., using Fu Malik algorithm. This is a sample).
Identifier is optional and used to group constraints together.
The F# sample illustrates what is meant.
Next steps:
- replace solver by opt_solver.
- create a file called opt_solver, copy most from smt_solver into it.
Add some functions to enable/disable post-optimization on feasiable state.
- Add methods to theory_arith.h to enable/disable post-optimization
- Add method(s) to theory_arith.h to register objective functions.
- Add post-optimization step to theory_arith_core.h
- (Figure out how to do multi-objective in this framework directly besides naive loop)

14
src/opt/weighted_maxsat.cpp
View file

@ -826,25 +826,11 @@ namespace opt {
pb_util u(m);
lbool is_sat = bound(al, ws, bs, k);
if (is_sat != l_true) return is_sat;
#if 0
rational mininc(0);
for (unsigned i = 0; i < ws.size(); ++i) {
if (mininc.is_zero() || mininc > ws[i]) {
mininc = ws[i];
}
}
k += mininc;
#else
expr_ref_vector al2(m);
al2.append(al);
// w_j*b_j > k
rational k0 = k;
al2.push_back(m.mk_not(u.mk_le(ws.size(), ws.c_ptr(), bs.c_ptr(), k)));
is_sat = bound(al2, ws, bs, k);
if (is_sat == l_true) {
SASSERT(k > k0);
}
#endif
return is_sat;
}

1
src/smt/params/smt_params.cpp
View file

@ -47,6 +47,7 @@ void smt_params::updt_params(params_ref const & p) {
qi_params::updt_params(p);
theory_arith_params::updt_params(p);
theory_bv_params::updt_params(p);
theory_pb_params::updt_params(p);
updt_local_params(p);
}

4
src/smt/params/smt_params.h
View file

@ -25,6 +25,7 @@ Revision History:
#include"theory_arith_params.h"
#include"theory_array_params.h"
#include"theory_bv_params.h"
#include"theory_pb_params.h"
#include"theory_datatype_params.h"
#include"preprocessor_params.h"
#include"context_params.h"
@ -73,7 +74,8 @@ struct smt_params : public preprocessor_params,
public qi_params,
public theory_arith_params,
public theory_array_params,
public theory_bv_params,
public theory_bv_params,
public theory_pb_params,
public theory_datatype_params {
bool m_display_proof;
bool m_display_dot_proof;

6
src/smt/params/smt_params_helper.pyg
View file

@ -41,4 +41,8 @@ def_module_params(module_name='smt',
('arith.propagation_mode', UINT, 2, '0 - no propagation, 1 - propagate existing literals, 2 - refine bounds'),
('arith.branch_cut_ratio', UINT, 2, 'branch/cut ratio for linear integer arithmetic'),
('arith.int_eq_branch', BOOL, False, 'branching using derived integer equations'),
('arith.ignore_int', BOOL, False, 'treat integer variables as real')))
('arith.ignore_int', BOOL, False, 'treat integer variables as real'),
('pb.conflict_frequency', UINT, 0, 'conflict frequency for Pseudo-Boolean theory'),
('pb.learn_complements', BOOL, True, 'learn complement literals for Pseudo-Boolean theory'),
('pb.enable_compilation', BOOL, True, 'enable compilation into sorting circuits for Pseudo-Boolean')))

27
src/smt/params/theory_pb_params.cpp Normal file
View file

@ -0,0 +1,27 @@
/*++
Copyright (c) 2014 Microsoft Corporation
Module Name:
theory_pb_params.cpp
Abstract:
<abstract>
Author:
Nikolaj Bjorner (nbjorner) 2014-01-01
Revision History:
--*/
#include"theory_pb_params.h"
#include"smt_params_helper.hpp"
void theory_pb_params::updt_params(params_ref const & _p) {
smt_params_helper p(_p);
m_pb_conflict_frequency = p.pb_conflict_frequency();
m_pb_learn_complements = p.pb_learn_complements();
m_pb_enable_compilation = p.pb_enable_compilation();
}

39
src/smt/params/theory_pb_params.h Normal file
View file

@ -0,0 +1,39 @@
/*++
Copyright (c) 2013 Microsoft Corporation
Module Name:
theory_pb_params.h
Abstract:
<abstract>
Author:
Nikolaj Bjorner (nbjorner) 2014-01-01
Revision History:
--*/
#ifndef _THEORY_PB_PARAMS_H_
#define _THEORY_PB_PARAMS_H_
#include"params.h"
struct theory_pb_params {
unsigned m_pb_conflict_frequency;
bool m_pb_learn_complements;
bool m_pb_enable_compilation;
theory_pb_params(params_ref const & p = params_ref()):
m_pb_conflict_frequency(0),
m_pb_learn_complements(true),
m_pb_enable_compilation(true)
{}
void updt_params(params_ref const & p);
};
#endif /* _THEORY_PB_PARAMS_H_ */

2
src/smt/smt_setup.cpp
View file

@ -793,7 +793,7 @@ namespace smt {
void setup::setup_card() {
// m_context.register_plugin(alloc(theory_card, m_manager));
m_context.register_plugin(alloc(theory_pb, m_manager));
m_context.register_plugin(alloc(theory_pb, m_manager, m_params));
}
void setup::setup_unknown() {

2
src/smt/smt_setup.h
View file

@ -42,7 +42,7 @@ namespace smt {
class setup {
context & m_context;
ast_manager & m_manager;
smt_params & m_params;
smt_params & m_params;
symbol m_logic;
bool m_already_configured;
void setup_auto_config();

42
src/smt/theory_pb.cpp
View file

@ -816,20 +816,23 @@ namespace smt {
return true;
}
theory_pb::theory_pb(ast_manager& m):
theory_pb::theory_pb(ast_manager& m, theory_pb_params& p):
theory(m.mk_family_id("pb")),
m_params(p),
m_util(m),
m_lemma(null_literal),
m_learn_complements(false),
m_conflict_frequency(0xF)
{}
m_lemma(null_literal)
{
m_learn_complements = p.m_pb_learn_complements;
m_conflict_frequency = p.m_pb_conflict_frequency;
m_enable_compilation = p.m_pb_enable_compilation;
}
theory_pb::~theory_pb() {
reset_eh();
}
theory * theory_pb::mk_fresh(context * new_ctx) {
return alloc(theory_pb, new_ctx->get_manager());
return alloc(theory_pb, new_ctx->get_manager(), m_params);
}
bool theory_pb::internalize_atom(app * atom, bool gate_ctx) {
@ -910,20 +913,21 @@ namespace smt {
// pre-compile threshold for cardinality
bool is_cardinality = true;
for (unsigned i = 0; is_cardinality && i < args.size(); ++i) {
is_cardinality = (args[i].second < rational(8));
bool enable_compile = m_enable_compilation;
for (unsigned i = 0; enable_compile && i < args.size(); ++i) {
enable_compile = (args[i].second < rational(8));
}
if (is_cardinality) {
if (enable_compile) {
unsigned log = 1, n = 1;
while (n <= args.size()) {
++log;
n *= 2;
}
unsigned th = 10*args.size()*log;
unsigned th = args.size()*log; // 10*
c->m_compilation_threshold = th;
IF_VERBOSE(2, verbose_stream() << "(smt.pb setting compilation threhshold to " << th << ")\n";);
TRACE("pb", tout << "compilation threshold: " << th << "\n";);
}
}
else {
c->m_compilation_threshold = UINT_MAX;
}
@ -1429,6 +1433,14 @@ namespace smt {
literal_vector in;
for (unsigned i = 0; i < num_args; ++i) {
rational n = c.coeff(i);
lbool val = ctx.get_assignment(c.lit());
if (val != l_undef &&
ctx.get_assign_level(thl) == ctx.get_base_level()) {
if (val == l_true) {
k -= n.get_unsigned();
}
continue;
}
while (n.is_pos()) {
in.push_back(c.lit(i));
n -= rational::one();
@ -1765,7 +1777,7 @@ namespace smt {
// same order as the assignment stack.
// It is not a correctness bug but causes to miss lemmas.
//
IF_VERBOSE(1, display_resolved_lemma(verbose_stream()););
IF_VERBOSE(2, display_resolved_lemma(verbose_stream()););
TRACE("pb", display_resolved_lemma(tout););
return false;
}
@ -1851,12 +1863,12 @@ namespace smt {
// 3x + 3y + z + u >= 4
// ~x /\ ~y => z + u >=
IF_VERBOSE(2, display(verbose_stream() << "lemma1: ", m_lemma););
IF_VERBOSE(4, display(verbose_stream() << "lemma1: ", m_lemma););
hoist_maximal_values();
lbool is_true = m_lemma.normalize();
m_lemma.prune();
IF_VERBOSE(2, display(verbose_stream() << "lemma2: ", m_lemma););
IF_VERBOSE(4, display(verbose_stream() << "lemma2: ", m_lemma););
switch(is_true) {
case l_true:
UNREACHABLE();

12
src/smt/theory_pb.h
View file

@ -23,6 +23,7 @@ Notes:
#include "smt_theory.h"
#include "pb_decl_plugin.h"
#include "smt_clause.h"
#include "theory_pb_params.h"
namespace smt {
class theory_pb : public theory {
@ -59,7 +60,7 @@ namespace smt {
unsigned m_num_propagations;
unsigned m_compilation_threshold;
lbool m_compiled;
ineq(literal l) : m_lit(l) {
reset();
}
@ -102,7 +103,8 @@ namespace smt {
};
typedef ptr_vector<ineq> watch_list;
theory_pb_params m_params;
u_map<watch_list*> m_watch; // per literal.
u_map<ineq*> m_ineqs; // per inequality.
unsigned_vector m_ineqs_trail;
@ -115,6 +117,7 @@ namespace smt {
ptr_vector<ineq> m_to_compile; // inequalities to compile.
unsigned m_conflict_frequency;
bool m_learn_complements;
bool m_enable_compilation;
// internalize_atom:
literal compile_arg(expr* arg);
@ -172,7 +175,7 @@ namespace smt {
void validate_assign(ineq const& c, literal_vector const& lits, literal l) const;
void validate_watch(ineq const& c) const;
public:
theory_pb(ast_manager& m);
theory_pb(ast_manager& m, theory_pb_params& p);
virtual ~theory_pb();
@ -194,9 +197,6 @@ namespace smt {
virtual model_value_proc * mk_value(enode * n, model_generator & mg);
virtual void init_model(model_generator & m);
void set_conflict_frequency(unsigned f) { m_conflict_frequency = f; }
void set_learn_complements(bool l) { m_learn_complements = l; }
static literal assert_ge(context& ctx, unsigned k, unsigned n, literal const* xs);
};
};

1
src/tactic/arith/lia2pb_tactic.cpp
View file

@ -71,6 +71,7 @@ class lia2pb_tactic : public tactic {
if (m_bm.has_lower(n, l, s) &&
m_bm.has_upper(n, u, s) &&
l.is_zero() &&
!u.is_neg() &&
u.get_num_bits() <= m_max_bits) {
return true;