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adding global lookahead variant to sls arith solver

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This commit is contained in:
Nikolaj Bjorner 2025-01-09 16:47:33 -08:00
parent f9ce41bd2b
commit 847278fba8
6 changed files with 552 additions and 9 deletions
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56
src/ast/sls/sls_arith_base.h
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@ -42,10 +42,16 @@ namespace sls {
unsigned t = 45;
unsigned max_no_improve = 500000;
double sp = 0.0003;
unsigned paws_init = 40;
unsigned paws_sp = 52;
bool paws = true;
unsigned max_moves = 500;
unsigned max_moves_base = 500;
};
struct stats {
unsigned m_num_steps = 0;
unsigned m_moves = 0;
};
public:
@ -274,6 +280,56 @@ namespace sls {
std::ostream& display(std::ostream& out, var_t v) const;
std::ostream& display(std::ostream& out, add_def const& ad) const;
std::ostream& display(std::ostream& out, mul_def const& md) const;
// for global lookahead search mode
void global_search();
struct bool_info {
unsigned weight = 0;
double score = 0;
unsigned touched = 0;
lbool value = l_undef;
};
vector<ptr_vector<app>> m_update_stack;
expr_mark m_in_update_stack;
svector<bool_info> m_bool_info;
double m_best_score = 0, m_top_score = 0;
unsigned m_min_depth = 0, m_max_depth = 0;
num_t m_best_value;
expr* m_best_expr = nullptr, * m_last_atom = nullptr;
expr_mark m_is_root;
sat::bool_var_set m_fixable_atoms;
uint_set m_fixable_vars;
ptr_vector<expr> m_fixable_exprs;
bool_info& get_bool_info(expr* e);
bool get_bool_value(expr* e);
bool get_bool_value_rec(expr* e);
void set_bool_value(expr* e, bool v) { get_bool_info(e).value = to_lbool(v); }
bool get_basic_bool_value(app* e);
void initialize_bool_assignment();
void finalize_bool_assignment();
double old_score(expr* e) { return get_bool_info(e).score; }
double new_score(expr* e);
double new_score(expr* e, bool is_true);
void set_score(expr* e, double s) { get_bool_info(e).score = s; }
void rescore();
void recalibrate_weights();
void inc_weight(expr* e) { ++get_bool_info(e).weight; }
void dec_weight(expr* e) { auto& i = get_bool_info(e); i.weight = i.weight > m_config.paws_init ? i.weight - 1 : m_config.paws_init; }
unsigned get_weight(expr* e) { return get_bool_info(e).weight; }
void insert_update_stack(expr* t);
void insert_update_stack_rec(expr* t);
void clear_update_stack();
void lookahead_num(var_t v, num_t const& value);
void lookahead_bool(expr* e);
double lookahead(expr* e);
void add_lookahead(expr* e);
void add_fixable(expr* e);
bool apply_move(expr* f, bool randomize);
expr* get_candidate_unsat();
void check_restart();
public:
arith_base(context& ctx);
~arith_base() override {}