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use expression structure for objectives instead of custom s-expression

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2013-12-02 13:00:51 -08:00
parent a016caa5d8
commit 191efbb72f
6 changed files with 251 additions and 71 deletions
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4
src/cmd_context/cmd_context.h
View file

@ -211,7 +211,6 @@ protected:
void register_builtin_sorts(decl_plugin * p);
void register_builtin_ops(decl_plugin * p);
void register_plugin(symbol const & name, decl_plugin * p, bool install_names);
void init_manager_core(bool new_manager);
void init_manager();
void init_external_manager();
@ -298,7 +297,8 @@ public:
check_sat_result * get_check_sat_result() const { return m_check_sat_result.get(); }
check_sat_state cs_state() const;
void validate_model();
void register_plugin(symbol const & name, decl_plugin * p, bool install_names);
bool is_func_decl(symbol const & s) const;
bool is_sort_decl(symbol const& s) const { return m_psort_decls.contains(s); }
void insert(cmd * c);

88
src/opt/objective_decl_plugin.cpp Normal file
View file

@ -0,0 +1,88 @@
/*++
Copyright (c) 2013 Microsoft Corporation
Module Name:
objective_decl_plugin.cpp
Abstract:
Abstract data-type for compound objectives.
Author:
Nikolaj Bjorner (nbjorner) 2013-11-21
Notes:
--*/
#include "objective_decl_plugin.h"
namespace opt{
objective_decl_plugin::objective_decl_plugin() {}
objective_decl_plugin::~objective_decl_plugin() {}
sort * objective_decl_plugin::mk_sort(decl_kind k, unsigned num_parameters, parameter const * parameters) {
SASSERT(k == OBJECTIVE_SORT);
SASSERT(num_parameters == 0);
return m_manager->mk_sort(symbol("objective"), sort_info(get_family_id(), k));
}
symbol objective_decl_plugin::get_name(obj_kind k) const {
switch(k) {
case OP_MINIMIZE: return symbol("minimize");
case OP_MAXIMIZE: return symbol("maximize");
case OP_LEX: return symbol("lex");
case OP_BOX: return symbol("box");
case OP_PARETO: return symbol("pareto");
default:
UNREACHABLE();
return symbol();
}
}
func_decl * objective_decl_plugin::mk_func_decl(
decl_kind k, unsigned num_parameters, parameter const * parameters,
unsigned arity, sort * const * domain, sort * range) {
SASSERT(num_parameters == 0);
symbol name = get_name(static_cast<obj_kind>(k));
func_decl_info info(get_family_id(), k, num_parameters, parameters);
return m_manager->mk_func_decl(name, arity, domain, range, info);
}
void objective_decl_plugin::get_op_names(svector<builtin_name> & op_names, symbol const & logic) {
if (logic == symbol::null) {
op_names.push_back(builtin_name(get_name(OP_MAXIMIZE).bare_str(), OP_MAXIMIZE));
op_names.push_back(builtin_name(get_name(OP_MINIMIZE).bare_str(), OP_MINIMIZE));
op_names.push_back(builtin_name(get_name(OP_LEX).bare_str(), OP_LEX));
op_names.push_back(builtin_name(get_name(OP_BOX).bare_str(), OP_BOX));
op_names.push_back(builtin_name(get_name(OP_PARETO).bare_str(), OP_PARETO));
}
}
objective_util::objective_util(ast_manager& m): m(m), m_fid(m.get_family_id("objective")) {}
app* objective_util::mk_max(expr_ref& e) {
expr* es[1] = { e };
return m.mk_app(m_fid, OP_MAXIMIZE, 0, 0, 1, es);
}
app* objective_util::mk_min(expr_ref& e) {
expr* es[1] = { e };
return m.mk_app(m_fid, OP_MINIMIZE, 0, 0, 1, es);
}
app* objective_util::mk_maxsat(symbol id) {
return m.mk_const(id, m.mk_sort(m_fid, OBJECTIVE_SORT, 0, 0));
}
app* objective_util::mk_lex(unsigned sz, expr * const * children) {
return m.mk_app(m_fid, OP_LEX, 0, 0, sz, children);
}
app* objective_util::mk_box(unsigned sz, expr * const * children) {
return m.mk_app(m_fid, OP_BOX, 0, 0, sz, children);
}
app* objective_util::mk_pareto(unsigned sz, expr * const * children) {
return m.mk_app(m_fid, OP_PARETO, 0, 0, sz, children);
}
}

71
src/opt/objective_decl_plugin.h Normal file
View file

@ -0,0 +1,71 @@
/*++
Copyright (c) 2013 Microsoft Corporation
Module Name:
objective_decl_plugin.h
Abstract:
Abstract data-type for compound objectives.
Author:
Nikolaj Bjorner (nbjorner) 2013-11-21
Notes:
--*/
#ifndef __OBJECTIVE_DECL_PLUGIN_H_
#define __OBJECTIVE_DECL_PLUGIN_H_
#include"ast.h"
namespace opt {
enum obj_kind {
OP_MINIMIZE,
OP_MAXIMIZE,
OP_LEX,
OP_BOX,
OP_PARETO,
LAST_OBJ_OP
};
enum objective_sort_kind {
OBJECTIVE_SORT
};
class objective_decl_plugin : public decl_plugin {
public:
objective_decl_plugin();
virtual ~objective_decl_plugin();
virtual sort * mk_sort(decl_kind k, unsigned num_parameters, parameter const * parameters);
virtual decl_plugin * mk_fresh() { return alloc(objective_decl_plugin); }
virtual func_decl * mk_func_decl(decl_kind k, unsigned num_parameters, parameter const * parameters,
unsigned arity, sort * const * domain, sort * range);
virtual void get_op_names(svector<builtin_name> & op_names, symbol const & logic);
private:
symbol objective_decl_plugin::get_name(obj_kind k) const;
};
class objective_util {
ast_manager& m;
family_id m_fid;
public:
objective_util(ast_manager& m);
family_id get_family_id() const { return m_fid; }
app* mk_max(expr_ref& e);
app* mk_min(expr_ref& e);
app* mk_maxsat(symbol id);
app* mk_lex(unsigned sz, expr * const * children);
app* mk_box(unsigned sz, expr * const * children);
app* mk_pareto(unsigned sz, expr * const * children);
};
};
#endif

59
src/opt/opt_cmds.cpp
View file

@ -30,6 +30,7 @@ Notes:
#include "scoped_timer.h"
#include "parametric_cmd.h"
#include "objective_ast.h"
#include "objective_decl_plugin.h"
class opt_context {
cmd_context& ctx;
@ -39,6 +40,8 @@ public:
opt::context& operator()() {
if (!m_opt) {
m_opt = alloc(opt::context, ctx.m());
decl_plugin * p = alloc(opt::objective_decl_plugin);
ctx.register_plugin(symbol("objective"), p, true);
}
return *m_opt;
}
@ -251,12 +254,13 @@ private:
class execute_cmd : public parametric_cmd {
protected:
sexpr * m_objective;
expr * m_objective;
opt_context& m_opt_ctx;
public:
execute_cmd(opt_context& opt_ctx):
parametric_cmd("optimize"),
m_opt_ctx(opt_ctx)
m_opt_ctx(opt_ctx),
m_objective(0)
{}
virtual void init_pdescrs(cmd_context & ctx, param_descrs & p) {
@ -270,19 +274,26 @@ public:
virtual char const * get_usage() const { return "(<keyword> <value>)*"; }
virtual void prepare(cmd_context & ctx) {
parametric_cmd::prepare(ctx);
m_objective = 0;
reset(ctx);
}
virtual void failure_cleanup(cmd_context & ctx) {
reset(ctx);
}
virtual void reset(cmd_context& ctx) {
if (m_objective) {
ctx.m().dec_ref(m_objective);
}
m_objective = 0;
}
virtual cmd_arg_kind next_arg_kind(cmd_context & ctx) const {
if (m_objective == 0) return CPK_SEXPR;
if (m_objective == 0) return CPK_EXPR;
return parametric_cmd::next_arg_kind(ctx);
}
virtual void set_next_arg(cmd_context & ctx, sexpr * arg) {
virtual void set_next_arg(cmd_context & ctx, expr * arg) {
m_objective = arg;
ctx.m().inc_ref(arg);
}
virtual void execute(cmd_context & ctx) {
@ -303,9 +314,7 @@ public:
scoped_timer timer(timeout, &eh);
cmd_context::scoped_watch sw(ctx);
try {
opt::objective * o = sexpr2objective(ctx, *m_objective);
r = opt.optimize(*o);
dealloc(o);
r = opt.optimize(m_objective);
}
catch (z3_error& ex) {
ctx.regular_stream() << "(error: " << ex.msg() << "\")" << std::endl;
@ -343,6 +352,18 @@ private:
m_opt_ctx().collect_statistics(stats);
stats.display_smt2(ctx.regular_stream());
}
};
void install_opt_cmds(cmd_context & ctx) {
opt_context* opt_ctx = alloc(opt_context, ctx);
ctx.insert(alloc(assert_weighted_cmd, ctx, *opt_ctx));
ctx.insert(alloc(execute_cmd, *opt_ctx));
//ctx.insert(alloc(min_maximize_cmd, ctx, *opt_ctx, true));
//ctx.insert(alloc(min_maximize_cmd, ctx, *opt_ctx, false));
//ctx.insert(alloc(optimize_cmd, *opt_ctx));
}
#if 0
expr_ref sexpr2expr(cmd_context & ctx, sexpr& s) {
expr_ref result(ctx.m());
@ -370,17 +391,18 @@ private:
ctx.mk_const(s.get_symbol(), result);
return result;
}
return result;
}
opt::objective_t get_objective_type(sexpr& s) {
if (!s.is_symbol())
throw cmd_exception("invalid objective, symbol expected", s.get_line(), s.get_pos());
symbol const & sym = s.get_symbol();
if (sym == symbol("maximize")) return opt::objective_t::MAXIMIZE;
if (sym == symbol("minimize")) return opt::objective_t::MINIMIZE;
if (sym == symbol("lex")) return opt::objective_t::LEX;
if (sym == symbol("box")) return opt::objective_t::BOX;
if (sym == symbol("pareto")) return opt::objective_t::PARETO;
if (sym == symbol("maximize")) return opt::MAXIMIZE;
if (sym == symbol("minimize")) return opt::MINIMIZE;
if (sym == symbol("lex")) return opt::LEX;
if (sym == symbol("box")) return opt::BOX;
if (sym == symbol("pareto")) return opt::PARETO;
throw cmd_exception("invalid objective, unexpected input", s.get_line(), s.get_pos());
}
@ -435,13 +457,4 @@ private:
return 0;
}
};
void install_opt_cmds(cmd_context & ctx) {
opt_context* opt_ctx = alloc(opt_context, ctx);
ctx.insert(alloc(assert_weighted_cmd, ctx, *opt_ctx));
ctx.insert(alloc(execute_cmd, *opt_ctx));
//ctx.insert(alloc(min_maximize_cmd, ctx, *opt_ctx, true));
//ctx.insert(alloc(min_maximize_cmd, ctx, *opt_ctx, false));
//ctx.insert(alloc(optimize_cmd, *opt_ctx));
}
#endif

83
src/opt/opt_context.cpp
View file

@ -28,7 +28,8 @@ namespace opt {
m(m),
m_hard_constraints(m),
m_optsmt(m),
m_objs(m)
m_objs(m),
m_obj_util(m)
{
m_params.set_bool("model", true);
m_params.set_bool("unsat_core", true);
@ -51,66 +52,74 @@ namespace opt {
ms->add(f, w);
}
lbool context::execute(objective & obj, bool committed) {
switch (obj.type()) {
case MINIMIZE:
case MAXIMIZE:
return execute_min_max(obj.get_min_max(), committed);
case MAXSAT:
return execute_maxsat(obj.get_maxsat(), committed);
case LEX:
return execute_lex(obj.get_compound());
case BOX:
return execute_box(obj.get_compound());
case PARETO:
return execute_pareto(obj.get_compound());
lbool context::execute(expr* _obj, bool committed) {
SASSERT(is_app(_obj));
app* obj = to_app(_obj);
if (obj->get_family_id() == null_family_id) {
return execute_maxsat(obj, committed);
}
if (obj->get_family_id() != m_obj_util.get_family_id()) {
// error
return l_undef;
}
switch (obj->get_decl_kind()) {
case OP_MINIMIZE:
case OP_MAXIMIZE:
return execute_min_max(obj, committed);
case OP_LEX:
return execute_lex(obj);
case OP_BOX:
return execute_box(obj);
case OP_PARETO:
return execute_pareto(obj);
default:
UNREACHABLE();
return l_undef;
}
}
lbool context::execute_min_max(min_max_objective & obj, bool committed) {
lbool context::execute_min_max(app* obj, bool committed) {
// HACK: reuse m_optsmt but add only a single objective each round
m_optsmt.add(to_app(obj.term()), obj.is_max());
bool is_max = (obj->get_decl_kind() == OP_MAXIMIZE);
m_optsmt.add(to_app(obj->get_arg(0)), is_max);
opt_solver& s = *m_solver.get();
lbool result = m_optsmt(s);
if (committed) m_optsmt.commit_assignment(0);
return result;
}
lbool context::execute_maxsat(maxsat_objective & obj, bool committed) {
lbool context::execute_maxsat(app* obj, bool committed) {
maxsmt* ms;
SASSERT(m_maxsmts.find(obj.get_id(), ms));
VERIFY(m_maxsmts.find(obj->get_decl()->get_name(), ms));
opt_solver& s = *m_solver.get();
lbool result = (*ms)(s);
if (committed) ms->commit_assignment();
return result;
}
lbool context::execute_lex(compound_objective & obj) {
ptr_vector<objective> children(obj.num_children(), obj.children());
lbool context::execute_lex(app* obj) {
lbool result = l_true;
for (unsigned i = 0; i < children.size(); ++i) {
result = execute(*children[i], true);
for (unsigned i = 0; i < obj->get_num_args(); ++i) {
result = execute(obj->get_arg(i), true);
if (result != l_true) break;
}
return result;
}
lbool context::execute_box(compound_objective & obj) {
ptr_vector<objective> children(obj.num_children(), obj.children());
lbool context::execute_box(app* obj) {
lbool result = l_true;
for (unsigned i = 0; i < children.size(); ++i) {
for (unsigned i = 0; i < obj->get_num_args(); ++i) {
push();
result = execute(*children[i], false);
result = execute(obj->get_arg(i), false);
pop(1);
if (result != l_true) break;
}
return result;
}
lbool context::execute_pareto(compound_objective & obj) {
lbool context::execute_pareto(app* obj) {
// TODO: record a stream of results from pareto front
return execute_lex(obj);
}
@ -125,7 +134,7 @@ namespace opt {
s.pop(sz);
}
lbool context::optimize(objective & objective) {
lbool context::optimize(expr* objective) {
opt_solver& s = *m_solver.get();
solver::scoped_push _sp(s);
@ -138,29 +147,27 @@ namespace opt {
lbool context::optimize() {
// Construct objectives
ptr_vector<objective> objectives;
expr_ref_vector objectives(m);
expr_ref objective(m);
objective_util util(m);
map_t::iterator it = m_maxsmts.begin(), end = m_maxsmts.end();
for (; it != end; ++it) {
objectives.push_back(objective::mk_maxsat(it->m_key));
objectives.push_back(util.mk_maxsat(it->m_key));
}
for (unsigned i = 0; i < m_objs.size(); ++i) {
expr_ref e(m_objs[i].get(), m);
objective * o = m_ismaxs[i] ? objective::mk_max(e) : objective::mk_min(e);
app * o = m_ismaxs[i] ? util.mk_max(e) : util.mk_min(e);
objectives.push_back(o);
}
objective * objective;
if (m_params.get_bool("pareto", false)) {
objective = objective::mk_pareto(objectives.size(), objectives.c_ptr());
objective = util.mk_pareto(objectives.size(), objectives.c_ptr());
}
else {
objective = objective::mk_box(objectives.size(), objectives.c_ptr());
objective = util.mk_box(objectives.size(), objectives.c_ptr());
}
lbool result = optimize(*objective);
dealloc(objective);
return result;
return optimize(objective);
}
void context::display_assignment(std::ostream& out) {

17
src/opt/opt_context.h
View file

@ -29,7 +29,7 @@ Notes:
#include "opt_solver.h"
#include "optsmt.h"
#include "maxsmt.h"
#include "objective_ast.h"
#include "objective_decl_plugin.h"
namespace opt {
@ -45,6 +45,7 @@ namespace opt {
map_t m_maxsmts;
expr_ref_vector m_objs;
svector<bool> m_ismaxs;
objective_util m_obj_util;
public:
context(ast_manager& m);
~context();
@ -52,17 +53,17 @@ namespace opt {
void add_objective(app* t, bool is_max) { m_objs.push_back(t); m_ismaxs.push_back(is_max); }
void add_hard_constraint(expr* f) { m_hard_constraints.push_back(f); }
lbool execute(objective & obj, bool committed);
lbool execute_min_max(min_max_objective & obj, bool committed);
lbool execute_maxsat(maxsat_objective & obj, bool committed);
lbool execute_lex(compound_objective & obj);
lbool execute_box(compound_objective & obj);
lbool execute_pareto(compound_objective & obj);
lbool execute(expr* obj, bool committed);
lbool execute_min_max(app* obj, bool committed);
lbool execute_maxsat(app* obj, bool committed);
lbool execute_lex(app* obj);
lbool execute_box(app* obj);
lbool execute_pareto(app* obj);
void push();
void pop(unsigned sz);
lbool optimize(objective & objective);
lbool optimize(expr* objective);
lbool optimize();
void set_cancel(bool f);