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remove parity_product and parity_product_or

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* NEWS: document it
* spot/twaalgos/parity.cc, spot/twaalgos/parity.hh,
  tests/core/parity.cc: here
This commit is contained in:
Maximilien Colange 2018-05-04 18:29:16 +02:00
parent 8120587fbf
commit 1aaeccf1d3
4 changed files with 4 additions and 451 deletions
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346
spot/twaalgos/parity.cc
View file

@ -338,350 +338,4 @@ namespace spot
return aut;
}
namespace
{
using state_history_value_t = unsigned;
class state_history : public std::vector<state_history_value_t>
{
public:
using value_t = state_history_value_t;
state_history(unsigned left_num_sets, unsigned right_num_sets) :
left_num_sets_(left_num_sets),
right_num_sets_(right_num_sets)
{
resize(left_num_sets + right_num_sets, 0);
}
value_t get_left(value_t right) const
{
return get(right, true);
}
value_t get_right(value_t left) const
{
return get(left, false);
}
void set_left(value_t right, value_t val)
{
set(right, true, val);
}
void set_right(value_t left, value_t val)
{
set(left, false, val);
}
unsigned get_left_num_sets() const
{
return left_num_sets_;
}
unsigned get_right_num_sets() const
{
return right_num_sets_;
}
value_t get_max_acc_set(bool and_cond) const
{
// i is the index of the resulting automaton acceptance set
// If i is even, it means that the according set is a set with
// transitions that need to be infinitly often as the
// acceptance is a parity even. Then k, the index of the
// first automaton must be even too.
unsigned l = right_num_sets_;
while (l-- > 0)
{
auto k = get_left(l);
bool can_jump = and_cond ? (k & l & 1) != 1 : ((k | l) & 1) != 0;
if (!can_jump)
--k;
auto new_l = get_right(k);
if (new_l >= l)
return k + l;
else if (can_jump)
l = new_l + 1;
}
return 0;
}
state_history make_succ(value_t left_acc_set,
value_t right_acc_set) const
{
auto mat = state_history(left_num_sets_, right_num_sets_);
for (unsigned i = 0; i < right_num_sets_; ++i)
{
auto old = get_left(i);
mat.set_left(i, std::max(left_acc_set, old));
}
for (unsigned i = 0; i < left_num_sets_; ++i)
{
auto old = get_right(i);
mat.set_right(i, std::max(right_acc_set, old));
}
return mat;
}
void clean_here()
{
auto mat = state_history(*this);
for (unsigned l = 0; l < right_num_sets_; ++l)
{
set_left(l, 0);
for (unsigned k = 0; k < left_num_sets_; ++k)
{
if (mat.get_right(k) < l)
set_left(l, std::min(mat.get_left(l), k));
else
break;
}
}
for (unsigned k = 0; k < left_num_sets_; ++k)
{
set_right(k, 0);
for (unsigned l = 0; l < right_num_sets_; ++l)
{
if (mat.get_left(l) < k)
set_right(k, std::min(mat.get_right(k), l));
else
break;
}
}
}
private:
const unsigned left_num_sets_;
const unsigned right_num_sets_;
value_t get(value_t index, bool first) const
{
return at(index + (first ? 0 : right_num_sets_));
}
void set(value_t index, bool first, value_t val)
{
at(index + (first ? 0 : right_num_sets_)) = val;
}
};
struct state_history_hash
{
size_t
operator()(const state_history& mat) const noexcept
{
unsigned result = 0;
for (unsigned i = 0; i < mat.get_left_num_sets(); ++i)
result = wang32_hash(result ^ wang32_hash(mat.get_right(i)));
for (unsigned i = 0; i < mat.get_right_num_sets(); ++i)
result = wang32_hash(result ^ wang32_hash(mat.get_left(i)));
return result;
}
};
using sh_label_t = unsigned;
class state_history_set
{
private:
using value_t = state_history::value_t;
public:
sh_label_t
push_state_history(state_history sh)
{
auto p = sh2l_.emplace(sh, 0);
if (p.second)
{
l2sh_.push_back(p.first);
p.first->second = l2sh_.size() - 1;
}
return p.first->second;
}
std::pair<sh_label_t, value_t>
push_state_history(sh_label_t label, value_t left_acc_set,
value_t right_acc_set, bool and_cond)
{
state_history new_sh = l2sh_[label]->first;
auto succ = new_sh.make_succ(left_acc_set, right_acc_set);
auto max_acc_set = succ.get_max_acc_set(and_cond);
succ.clean_here();
return std::make_pair(push_state_history(succ), max_acc_set);
}
std::pair<sh_label_t, value_t>
get_succ(sh_label_t current_sh, value_t left_acc_set,
value_t right_acc_set, bool and_cond)
{
auto f_args = std::make_tuple(current_sh, left_acc_set, right_acc_set);
auto p = succ_.emplace(f_args, std::make_pair(0, 0));
if (p.second)
{
p.first->second =
push_state_history(current_sh, left_acc_set,
right_acc_set, and_cond);
}
return p.first->second;
}
private:
using sh_dict_t = std::unordered_map<const state_history,
value_t,
state_history_hash>;
sh_dict_t sh2l_;
struct sh_succ_hash
{
size_t
operator()(std::tuple<sh_label_t, value_t, value_t> x) const noexcept
{
return wang32_hash(std::get<0>(x) ^ wang32_hash(std::get<1>(x)
^ wang32_hash(std::get<2>(x))));
}
};
std::unordered_map<std::tuple<sh_label_t, value_t, value_t>,
std::pair<sh_label_t, value_t>,
sh_succ_hash> succ_;
std::vector<sh_dict_t::const_iterator> l2sh_;
};
using product_state_t = std::tuple<unsigned, unsigned, sh_label_t>;
struct product_state_hash
{
size_t
operator()(product_state_t s) const noexcept
{
return wang32_hash(std::get<0>(s) ^ wang32_hash(std::get<1>(s)
^ wang32_hash(std::get<2>(s))));
}
};
twa_graph_ptr
parity_product_aux(const const_twa_graph_ptr& first,
const const_twa_graph_ptr& second,
bool and_cond)
{
auto left = change_parity(first, parity_kind_max, parity_style_even);
auto right = change_parity(second, parity_kind_max, parity_style_even);
if (!and_cond)
{
complete_here(left);
complete_here(right);
}
cleanup_parity_here(left, true);
cleanup_parity_here(right, true);
colorize_parity_here(left, true);
colorize_parity_here(right, true);
std::unordered_map<product_state_t, unsigned, product_state_hash> s2n;
state_history_set sh_set;
std::queue<std::pair<product_state_t, unsigned>> todo;
auto res = make_twa_graph(left->get_dict());
res->copy_ap_of(left);
res->copy_ap_of(right);
unsigned left_num_sets = left->num_sets();
unsigned right_num_sets = right->num_sets();
unsigned z_size = left_num_sets + right_num_sets - 1;
auto z = acc_cond::acc_code::parity(true, !and_cond, z_size);
res->set_acceptance(z_size, z);
auto v = new product_states;
res->set_named_prop("product-states", v);
auto new_state =
[&](const sh_label_t sh_label,
unsigned left_state, unsigned right_state,
unsigned left_acc_set, unsigned right_acc_set)
-> std::pair<unsigned, unsigned>
{
auto succ = sh_set.get_succ(sh_label, left_acc_set, right_acc_set,
and_cond);
product_state_t x(left_state, right_state, succ.first);
auto p = s2n.emplace(x, 0);
if (p.second) // This is a new state
{
auto new_state = res->new_state();
p.first->second = new_state;
v->push_back(std::make_pair(left_state, right_state));
todo.emplace(x, new_state);
}
return std::make_pair(p.first->second, succ.second);
};
state_history init_state_history(left_num_sets, right_num_sets);
auto init_sh_label = sh_set.push_state_history(init_state_history);
product_state_t init_state(left->get_init_state_number(),
right->get_init_state_number(), init_sh_label);
auto init_state_index = res->new_state();
s2n.emplace(init_state, init_state_index);
todo.emplace(init_state, init_state_index);
res->set_init_state(init_state_index);
while (!todo.empty())
{
auto& top = todo.front();
for (auto& l: left->out(std::get<0>(top.first)))
for (auto& r: right->out(std::get<1>(top.first)))
{
auto cond = l.cond & r.cond;
if (cond == bddfalse)
continue;
auto left_acc = l.acc.max_set() - 1;
auto right_acc = r.acc.max_set() - 1;
auto dst = new_state(std::get<2>(top.first), l.dst, r.dst,
left_acc, right_acc);
auto acc = acc_cond::mark_t{dst.second};
res->new_edge(top.second, dst.first, cond, acc);
}
todo.pop();
}
// The product of two non-deterministic automata could be
// deterministic. likewise for non-complete automata.
if (left->prop_universal() && right->prop_universal())
res->prop_universal(true);
if (left->prop_complete() && right->prop_complete())
res->prop_complete(true);
if (left->prop_stutter_invariant() && right->prop_stutter_invariant())
res->prop_stutter_invariant(true);
if (left->prop_inherently_weak() && right->prop_inherently_weak())
res->prop_inherently_weak(true);
if (left->prop_weak() && right->prop_weak())
res->prop_weak(true);
if (left->prop_terminal() && right->prop_terminal())
res->prop_terminal(true);
res->prop_state_acc(left->prop_state_acc() && right->prop_state_acc());
return res;
}
}
twa_graph_ptr
parity_product(const const_twa_graph_ptr& left,
const const_twa_graph_ptr& right)
{
if (left->get_dict() != right->get_dict())
throw std::runtime_error("parity_product: left and right automata "
"should share their bdd_dict");
if (!(left->is_existential() && right->is_existential()))
throw std::runtime_error("parity_product() does not support alternating "
"automata");
return parity_product_aux(left, right, true);
}
twa_graph_ptr
parity_product_or(const const_twa_graph_ptr& left,
const const_twa_graph_ptr& right)
{
if (left->get_dict() != right->get_dict())
throw std::runtime_error("parity_product_or: left and right automata "
"should share their bdd_dict");
if (!(left->is_existential() && right->is_existential()))
throw std::runtime_error("parity_product_or() does not support "
"alternating automata");
return parity_product_aux(left, right, false);
}
}

35
spot/twaalgos/parity.hh
View file

@ -133,39 +133,4 @@ namespace spot
SPOT_API twa_graph_ptr
colorize_parity_here(twa_graph_ptr aut, bool keep_style = false);
/// @}
/// \brief Construct a product performing the intersection of two automata
/// with parity acceptance and keeping their parity acceptance
///
/// This is based on an algorithm introduced by Olivier Carton (Theoretical
/// Computer Science 161, 1-2 (1996)). The output is a parity max even
/// automaton. The inputs must be automata with a parity acceptance, otherwise
/// an invalid_argument exception is thrown.
///
/// \param left the first automaton
///
/// \param right the second automaton
///
/// \result the product, which is a parity automaton
SPOT_API twa_graph_ptr
parity_product(const const_twa_graph_ptr& left,
const const_twa_graph_ptr& right);
/// \brief Construct a product performing the union of two automata
/// with parity acceptance and keeping their parity acceptance
///
/// This is based on an algorithm introduced by Olivier Carton (Theoretical
/// Computer Science 161, 1-2 (1996)). The output is a parity max even
/// automaton. The inputs must be automata with a parity acceptance, otherwise
/// an invalid_argument exception is thrown.
///
/// \param left the first automaton
///
/// \param right the second automaton
///
/// \result the sum which is a parity automaton
SPOT_API twa_graph_ptr
parity_product_or(const const_twa_graph_ptr& left,
const const_twa_graph_ptr& right);
/// @}
}