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Revise optimize commands

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This commit is contained in:
Anh-Dung Phan 2013-11-26 12:54:18 -08:00
parent dbc791d385
commit 4aa9c742ab
3 changed files with 169 additions and 12 deletions
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159
src/opt/opt_cmds.cpp
View file

@ -29,7 +29,7 @@ Notes:
#include "scoped_ctrl_c.h"
#include "scoped_timer.h"
#include "parametric_cmd.h"
#include "objective_ast.h"
class opt_context {
cmd_context& ctx;
@ -248,10 +248,161 @@ private:
}
};
static expr* sexpr2expr(cmd_context & ctx, sexpr * s) {
NOT_IMPLEMENTED_YET();
return 0;
}
static opt::objective* sexpr2objective(cmd_context & ctx, sexpr * s) {
if (s->is_symbol())
throw cmd_exception("invalid objective, more arguments expected ", s->get_symbol(), s->get_line(), s->get_pos());
if (s->is_composite()) {
sexpr * head = s->get_child(0);
if (!head->is_symbol())
throw cmd_exception("invalid objective, symbol expected", s->get_line(), s->get_pos());
symbol const & cmd_name = head->get_symbol();
if (cmd_name == "maximize" || cmd_name == "minimize") {
if (s->get_num_children() != 2)
throw cmd_exception("invalid objective, wrong number of arguments ", s->get_line(), s->get_pos());
sexpr * arg = s->get_child(1);
expr_ref term(sexpr2expr(ctx, arg), ctx.m());
if (cmd_name == "maximize")
return opt::objective::mk_max(term);
else
return opt::objective::mk_min(term);
}
else if (cmd_name == "maxsat") {
if (s->get_num_children() != 2)
throw cmd_exception("invalid objective, wrong number of arguments ", s->get_line(), s->get_pos());
sexpr * arg = s->get_child(1);
if (!arg->is_symbol())
throw cmd_exception("invalid objective, symbol expected", s->get_line(), s->get_pos());
symbol const & id = arg->get_symbol();
// TODO: check whether id is declared via assert-weighted
return opt::objective::mk_maxsat(id);
}
else if (cmd_name == "lex" || cmd_name == "box" || cmd_name == "pareto") {
if (s->get_num_children() <= 2)
throw cmd_exception("invalid objective, wrong number of arguments ", s->get_line(), s->get_pos());
unsigned num_children = s->get_num_children();
ptr_vector<opt::objective> args;
for (unsigned i = 1; i < num_children; i++)
args.push_back(sexpr2objective(ctx, s->get_child(i)));
if (cmd_name == "lex")
return opt::objective::mk_lex(args.size(), args.c_ptr());
else if (cmd_name == "box")
return opt::objective::mk_box(args.size(), args.c_ptr());
else
return opt::objective::mk_pareto(args.size(), args.c_ptr());
}
else {
throw cmd_exception("invalid objective, unexpected input", s->get_line(), s->get_pos());
}
}
return 0;
}
class execute_cmd : public parametric_cmd {
protected:
sexpr * m_objective;
opt_context& m_opt_ctx;
public:
execute_cmd(opt_context& opt_ctx):
parametric_cmd("optimize"),
m_opt_ctx(opt_ctx)
{}
virtual void init_pdescrs(cmd_context & ctx, param_descrs & p) {
insert_timeout(p);
insert_max_memory(p);
p.insert("print_statistics", CPK_BOOL, "(default: false) print statistics.");
opt::context::collect_param_descrs(p);
}
virtual char const * get_main_descr() const { return "check sat modulo objective function";}
virtual char const * get_usage() const { return "(<keyword> <value>)*"; }
virtual void prepare(cmd_context & ctx) {
parametric_cmd::prepare(ctx);
m_objective = 0;
}
virtual void failure_cleanup(cmd_context & ctx) {
reset(ctx);
}
virtual cmd_arg_kind next_arg_kind(cmd_context & ctx) const {
if (m_objective == 0) return CPK_SEXPR;
return parametric_cmd::next_arg_kind(ctx);
}
virtual void set_next_arg(cmd_context & ctx, sexpr * arg) {
m_objective = arg;
}
virtual void execute(cmd_context & ctx) {
params_ref p = ctx.params().merge_default_params(ps());
opt::context& opt = m_opt_ctx();
opt.updt_params(p);
unsigned timeout = p.get_uint("timeout", UINT_MAX);
ptr_vector<expr>::const_iterator it = ctx.begin_assertions();
ptr_vector<expr>::const_iterator end = ctx.end_assertions();
for (; it != end; ++it) {
opt.add_hard_constraint(*it);
}
lbool r = l_undef;
cancel_eh<opt::context> eh(opt);
{
scoped_ctrl_c ctrlc(eh);
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);
}
catch (z3_error& ex) {
ctx.regular_stream() << "(error: " << ex.msg() << "\")" << std::endl;
}
catch (z3_exception& ex) {
ctx.regular_stream() << "(error: " << ex.msg() << "\")" << std::endl;
}
}
switch(r) {
case l_true:
ctx.regular_stream() << "sat\n";
opt.display_assignment(ctx.regular_stream());
break;
case l_false:
ctx.regular_stream() << "unsat\n";
break;
case l_undef:
ctx.regular_stream() << "unknown\n";
opt.display_range_assignment(ctx.regular_stream());
break;
}
if (p.get_bool("print_statistics", false)) {
display_statistics(ctx);
}
}
private:
void display_statistics(cmd_context& ctx) {
statistics stats;
unsigned long long max_mem = memory::get_max_used_memory();
unsigned long long mem = memory::get_allocation_size();
stats.update("time", ctx.get_seconds());
stats.update("memory", static_cast<double>(mem)/static_cast<double>(1024*1024));
stats.update("max memory", static_cast<double>(max_mem)/static_cast<double>(1024*1024));
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(min_maximize_cmd, ctx, *opt_ctx, true));
ctx.insert(alloc(min_maximize_cmd, ctx, *opt_ctx, false));
ctx.insert(alloc(optimize_cmd, *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));
}

20
src/opt/opt_context.cpp
View file

@ -111,6 +111,17 @@ namespace opt {
return execute_lex(obj);
}
lbool context::optimize(objective & objective) {
opt_solver& s = *m_solver.get();
solver::scoped_push _sp(s);
for (unsigned i = 0; i < m_hard_constraints.size(); ++i) {
s.assert_expr(m_hard_constraints[i].get());
}
return execute(objective, false);
}
lbool context::optimize() {
// Construct objectives
ptr_vector<objective> objectives;
@ -133,14 +144,7 @@ namespace opt {
objective = objective::mk_box(objectives.size(), objectives.c_ptr());
}
opt_solver& s = *m_solver.get();
solver::scoped_push _sp(s);
for (unsigned i = 0; i < m_hard_constraints.size(); ++i) {
s.assert_expr(m_hard_constraints[i].get());
}
lbool result = execute(*objective, false);
lbool result = optimize(*objective);
dealloc(objective);
return result;
}

2
src/opt/opt_context.h
View file

@ -59,7 +59,9 @@ namespace opt {
lbool execute_box(compound_objective & obj);
lbool execute_pareto(compound_objective & obj);
lbool optimize(objective & objective);
lbool optimize();
void set_cancel(bool f);
void reset_cancel() { set_cancel(false); }
void cancel() { set_cancel(true); }