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#5641 - projection that skips interpreted functions can violate model evaluation.

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This commit is contained in:
Nikolaj Bjorner 2022-01-02 17:45:43 -08:00
parent 0ca5e7207e
commit d0fb3cba15
10 changed files with 46 additions and 36 deletions
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45
src/qe/mbp/mbp_arith.cpp
View file

@ -249,8 +249,8 @@ namespace mbp {
bool operator()(model& model, app* v, app_ref_vector& vars, expr_ref_vector& lits) {
app_ref_vector vs(m);
vs.push_back(v);
project(model, vs, lits, false);
return vs.empty();
vector<def> defs;
return project(model, vs, lits, defs, false) && vs.empty();
}
typedef opt::model_based_opt::var var;
@ -265,12 +265,12 @@ namespace mbp {
return t;
}
vector<def> project(model& model, app_ref_vector& vars, expr_ref_vector& fmls, bool compute_def) {
bool project(model& model, app_ref_vector& vars, expr_ref_vector& fmls, vector<def>& result, bool compute_def) {
bool has_arith = false;
for (expr* v : vars)
has_arith |= is_arith(v);
if (!has_arith)
return vector<def>();
return true;
model_evaluator eval(model);
TRACE("qe", tout << model;);
eval.set_model_completion(true);
@ -294,7 +294,7 @@ namespace mbp {
}
fmls.shrink(j);
TRACE("qe", tout << "formulas\n" << fmls << "\n";
for (auto [e, id] : tids)
for (auto const& [e, id] : tids)
tout << mk_pp(e, m) << " -> " << id << "\n";);
// fmls holds residue,
@ -312,7 +312,7 @@ namespace mbp {
rational r;
expr_ref val = eval(v);
if (!m.inc())
return vector<def>();
return false;
if (!a.is_numeral(val, r))
throw default_exception("evaluation did not produce a numeral");
TRACE("qe", tout << mk_pp(v, m) << " " << val << "\n";);
@ -326,15 +326,13 @@ namespace mbp {
if (is_arith(e) && !var_mark.is_marked(e))
mark_rec(fmls_mark, e);
}
if (m_check_purified) {
for (expr* fml : fmls)
mark_rec(fmls_mark, fml);
for (auto& kv : tids) {
expr* e = kv.m_key;
if (!var_mark.is_marked(e)) {
if (!var_mark.is_marked(e))
mark_rec(fmls_mark, e);
}
}
}
@ -364,16 +362,18 @@ namespace mbp {
for (auto const& d : defs) tout << "def: " << d << "\n";
tout << fmls << "\n";);
vector<def> result;
if (compute_def)
optdefs2mbpdef(defs, index2expr, real_vars, result);
if (m_apply_projection)
apply_projection(result, fmls);
if (m_apply_projection && !apply_projection(eval, result, fmls))
return false;
TRACE("qe",
for (auto [v, t] : result)
for (auto const& [v, t] : result)
tout << v << " := " << t << "\n";
for (auto* f : fmls)
tout << mk_pp(f, m) << " := " << eval(f) << "\n";
tout << "fmls:" << fmls << "\n";);
return result;
return true;
}
void optdefs2mbpdef(vector<opt::model_based_opt::def> const& defs, ptr_vector<expr> const& index2expr, unsigned_vector const& real_vars, vector<def>& result) {
@ -548,10 +548,11 @@ namespace mbp {
}
}
void apply_projection(vector<def>& defs, expr_ref_vector& fmls) {
bool apply_projection(model_evaluator& eval, vector<def> const& defs, expr_ref_vector& fmls) {
if (fmls.empty() || defs.empty())
return;
return true;
expr_safe_replace subst(m);
expr_ref_vector fmls_tmp(m);
expr_ref tmp(m);
for (unsigned i = defs.size(); i-- > 0; ) {
auto const& d = defs[i];
@ -561,8 +562,11 @@ namespace mbp {
unsigned j = 0;
for (expr* fml : fmls) {
subst(fml, tmp);
if (m.is_false(eval(tmp)))
return false;
fmls[j++] = tmp;
}
return true;
}
};
@ -579,12 +583,13 @@ namespace mbp {
return (*m_imp)(model, var, vars, lits);
}
void arith_project_plugin::operator()(model& model, app_ref_vector& vars, expr_ref_vector& lits) {
m_imp->project(model, vars, lits, false);
bool arith_project_plugin::operator()(model& model, app_ref_vector& vars, expr_ref_vector& lits) {
vector<def> defs;
return m_imp->project(model, vars, lits, defs, false);
}
vector<def> arith_project_plugin::project(model& model, app_ref_vector& vars, expr_ref_vector& lits) {
return m_imp->project(model, vars, lits, true);
bool arith_project_plugin::project(model& model, app_ref_vector& vars, expr_ref_vector& lits, vector<def>& defs) {
return m_imp->project(model, vars, lits, defs, true);
}
void arith_project_plugin::set_check_purified(bool check_purified) {

4
src/qe/mbp/mbp_arith.h
View file

@ -29,8 +29,8 @@ namespace mbp {
bool operator()(model& model, app* var, app_ref_vector& vars, expr_ref_vector& lits) override;
bool solve(model& model, app_ref_vector& vars, expr_ref_vector& lits) override { return false; }
family_id get_family_id() override;
void operator()(model& model, app_ref_vector& vars, expr_ref_vector& lits) override;
vector<def> project(model& model, app_ref_vector& vars, expr_ref_vector& lits) override;
bool operator()(model& model, app_ref_vector& vars, expr_ref_vector& lits) override;
bool project(model& model, app_ref_vector& vars, expr_ref_vector& lits, vector<def>& defs) override;
void saturate(model& model, func_decl_ref_vector const& shared, expr_ref_vector& lits) override { UNREACHABLE(); }
opt::inf_eps maximize(expr_ref_vector const& fmls, model& mdl, app* t, expr_ref& ge, expr_ref& gt);

4
src/qe/mbp/mbp_arrays.cpp
View file

@ -1624,8 +1624,8 @@ namespace mbp {
);
}
vector<def> array_project_plugin::project(model& model, app_ref_vector& vars, expr_ref_vector& lits) {
return vector<def>();
bool array_project_plugin::project(model& model, app_ref_vector& vars, expr_ref_vector& lits, vector<def>& defs) {
return true;
}
void array_project_plugin::saturate(model& model, func_decl_ref_vector const& shared, expr_ref_vector& lits) {

2
src/qe/mbp/mbp_arrays.h
View file

@ -35,7 +35,7 @@ namespace mbp {
bool solve(model& model, app_ref_vector& vars, expr_ref_vector& lits) override;
void operator()(model& model, app_ref_vector& vars, expr_ref& fml, app_ref_vector& aux_vars, bool reduce_all_selects);
family_id get_family_id() override;
vector<def> project(model& model, app_ref_vector& vars, expr_ref_vector& lits) override;
bool project(model& model, app_ref_vector& vars, expr_ref_vector& lits, vector<def>& defs) override;
void saturate(model& model, func_decl_ref_vector const& shared, expr_ref_vector& lits) override;
};

4
src/qe/mbp/mbp_datatypes.cpp
View file

@ -300,8 +300,8 @@ namespace mbp {
return m_imp->solve(model, vars, lits);
}
vector<def> datatype_project_plugin::project(model& model, app_ref_vector& vars, expr_ref_vector& lits) {
return vector<def>();
bool datatype_project_plugin::project(model& model, app_ref_vector& vars, expr_ref_vector& lits, vector<def>& defs) {
return true;
}
void datatype_project_plugin::saturate(model& model, func_decl_ref_vector const& shared, expr_ref_vector& lits) {

2
src/qe/mbp/mbp_datatypes.h
View file

@ -34,7 +34,7 @@ namespace mbp {
bool operator()(model& model, app* var, app_ref_vector& vars, expr_ref_vector& lits) override;
bool solve(model& model, app_ref_vector& vars, expr_ref_vector& lits) override;
family_id get_family_id() override;
vector<def> project(model& model, app_ref_vector& vars, expr_ref_vector& lits) override;
bool project(model& model, app_ref_vector& vars, expr_ref_vector& lits, vector<def>& defs) override;
void saturate(model& model, func_decl_ref_vector const& shared, expr_ref_vector& lits) override;
};

4
src/qe/mbp/mbp_plugin.h
View file

@ -67,7 +67,7 @@ namespace mbp {
virtual bool solve(model& model, app_ref_vector& vars, expr_ref_vector& lits) { return false; }
virtual family_id get_family_id() { return null_family_id; }
virtual void operator()(model& model, app_ref_vector& vars, expr_ref_vector& lits) { };
virtual bool operator()(model& model, app_ref_vector& vars, expr_ref_vector& lits) { return false; };
/**
\brief project vars modulo model, return set of definitions for eliminated variables.
@ -76,7 +76,7 @@ namespace mbp {
- returns set of definitions
(TBD: in triangular form, the last definition can be substituted into definitions that come before)
*/
virtual vector<def> project(model& model, app_ref_vector& vars, expr_ref_vector& lits) { return vector<def>(); }
virtual bool project(model& model, app_ref_vector& vars, expr_ref_vector& lits, vector<def>& defs) { return true; }
/**
\brief model based saturation. Saturates theory axioms to equi-satisfiable literals over EUF,

5
src/qe/qe_mbi.cpp
View file

@ -266,7 +266,10 @@ namespace qe {
vector<mbp::def> uflia_mbi::arith_project(model_ref& mdl, app_ref_vector& avars, expr_ref_vector& lits) {
mbp::arith_project_plugin ap(m);
ap.set_check_purified(false);
return ap.project(*mdl.get(), avars, lits);
vector<mbp::def> defs;
bool ok = ap.project(*mdl.get(), avars, lits, defs);
CTRACE("qe", !ok, tout << "projection failure ignored!!!!\n");
return defs;
}
mbi_result uflia_mbi::operator()(expr_ref_vector& lits, model_ref& mdl) {

8
src/sat/smt/q_mbi.cpp
View file

@ -67,7 +67,7 @@ namespace q {
}
}
m_max_cex += ctx.get_config().m_mbqi_max_cexs;
for (auto [qlit, fml, generation] : m_instantiations) {
for (auto const& [qlit, fml, generation] : m_instantiations) {
euf::solver::scoped_generation sg(ctx, generation + 1);
sat::literal lit = ctx.mk_literal(fml);
m_qs.add_clause(~qlit, ~lit);
@ -308,8 +308,10 @@ namespace q {
proj.extract_literals(*m_model, vars, fmls);
fmls_extracted = true;
}
if (p)
(*p)(*m_model, vars, fmls);
if (!p)
continue;
if (!(*p)(*m_model, vars, fmls))
return expr_ref(nullptr, m);
}
for (app* v : vars) {
expr_ref term(m);

2
src/sat/smt/q_model_fixer.cpp
View file

@ -256,7 +256,7 @@ namespace q {
tout << "invert-app " << mk_pp(t, m) << " = " << mk_pp(value, m) << "\n";
if (v2r.find(value, r))
tout << "inverse " << mk_pp(r->get_expr(), m) << "\n";
ctx.display(tout);
/*ctx.display(tout); */
);
if (v2r.find(value, r))
return r->get_expr();