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Multi-objectivePreprocessor: identify a subset of the states that can be made absorbing.

tempestpy_adaptions
Tim Quatmann 5 years ago
parent
92dd97b06a
commit
1f68e1d05e
2 changed files with 121 additions and 25 deletions
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  1. 121
      src/storm/modelchecker/multiobjective/preprocessing/SparseMultiObjectivePreprocessor.cpp
  2. 25
      src/storm/modelchecker/multiobjective/preprocessing/SparseMultiObjectivePreprocessor.h

121
src/storm/modelchecker/multiobjective/preprocessing/SparseMultiObjectivePreprocessor.cpp
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@ -17,6 +17,8 @@
#include "storm/utility/macros.h"
#include "storm/utility/vector.h"
#include "storm/utility/graph.h"
#include "storm/utility/FilteredRewardModel.h"
#include "storm/transformer/SubsystemBuilder.h"
#include "storm/settings/SettingsManager.h"
#include "storm/settings/modules/GeneralSettings.h"
@ -51,6 +53,9 @@ namespace storm {
model = storm::transformer::MemoryIncorporation<SparseModelType>::incorporateGoalMemory(originalModel, originalFormula.getSubformulas());
}
// Remove states that are irrelevant for all properties (e.g. because they are only reachable via goal states
removeIrrelevantStates(model, originalFormula);
PreprocessorData data(model);
//Invoke preprocessing on the individual objectives
@ -60,11 +65,8 @@ namespace storm {
data.objectives.back()->originalFormula = subFormula;
data.finiteRewardCheckObjectives.resize(data.objectives.size(), false);
data.upperResultBoundObjectives.resize(data.objectives.size(), false);
if (data.objectives.back()->originalFormula->isOperatorFormula()) {
preprocessOperatorFormula(data.objectives.back()->originalFormula->asOperatorFormula(), data);
} else {
STORM_LOG_THROW(false, storm::exceptions::InvalidPropertyException, "Could not preprocess the subformula " << *subFormula << " of " << originalFormula << " because it is not supported");
}
STORM_LOG_THROW(data.objectives.back()->originalFormula->isOperatorFormula(), storm::exceptions::InvalidPropertyException, "Could not preprocess the subformula " << *subFormula << " of " << originalFormula << " because it is not supported");
preprocessOperatorFormula(data.objectives.back()->originalFormula->asOperatorFormula(), data);
}
// Remove reward models that are not needed anymore
@ -78,6 +80,115 @@ namespace storm {
return buildResult(originalModel, originalFormula, data);
}
template <typename SparseModelType>
storm::storage::BitVector getOnlyReachableViaPhi(SparseModelType const& model, storm::storage::BitVector const& phi) {
// Get the complement of the states that are reachable without visiting phi
auto result = storm::utility::graph::getReachableStates(model.getTransitionMatrix(), model.getInitialStates(), ~phi, storm::storage::BitVector(phi.size(), false));
result.complement();
assert(phi.isSubsetOf(result));
return result;
}
template <typename SparseModelType>
storm::storage::BitVector getZeroRewardStates(SparseModelType const& model, storm::storage::SparseMatrix<typename SparseModelType::ValueType> const& backwardTransitions, typename SparseModelType::RewardModelType const& rewardModel, boost::optional<storm::storage::BitVector> const& rew0States) {
storm::storage::BitVector statesWithoutReward = rewardModel.getStatesWithZeroReward(model.getTransitionMatrix());
if (rew0States) {
statesWithoutReward |= rew0States.get();
}
storm::storage::BitVector result = storm::utility::graph::performProbGreater0E(model.getBackwardTransitions(), statesWithoutReward, ~statesWithoutReward);
result.complement();
return result;
}
template <typename SparseModelType>
void SparseMultiObjectivePreprocessor<SparseModelType>::removeIrrelevantStates(std::shared_ptr<SparseModelType>& model, storm::logic::MultiObjectiveFormula const& originalFormula) {
storm::storage::BitVector absorbingStates(model->getNumberOfStates(), true);
storm::modelchecker::SparsePropositionalModelChecker<SparseModelType> mc(*model);
storm::storage::SparseMatrix<ValueType> backwardTransitions = model->getBackwardTransitions();
for (auto const& opFormula : originalFormula.getSubformulas()) {
// Compute a set of states from which we can make any subset absorbing without affecting this subformula
storm::storage::BitVector absorbingStatesForSubformula;
STORM_LOG_THROW(opFormula->isOperatorFormula(), storm::exceptions::InvalidPropertyException, "Could not preprocess the subformula " << *opFormula << " of " << originalFormula << " because it is not supported");
auto const& pathFormula = opFormula->asOperatorFormula().getSubformula();
if (opFormula->isProbabilityOperatorFormula()) {
if (pathFormula.isUntilFormula()){
auto lhs = mc.check(pathFormula.asUntilFormula().getLeftSubformula())->asExplicitQualitativeCheckResult().getTruthValuesVector();
auto rhs = mc.check(pathFormula.asUntilFormula().getRightSubformula())->asExplicitQualitativeCheckResult().getTruthValuesVector();
absorbingStatesForSubformula = storm::utility::graph::performProb0A(backwardTransitions, lhs, rhs);
absorbingStatesForSubformula |= getOnlyReachableViaPhi(*model, ~lhs | rhs);
} else if (pathFormula.isBoundedUntilFormula()) {
if (!pathFormula.asBoundedUntilFormula().hasLowerBound()) {
auto lhs = mc.check(pathFormula.asBoundedUntilFormula().getLeftSubformula())->asExplicitQualitativeCheckResult().getTruthValuesVector();
auto rhs = mc.check(pathFormula.asBoundedUntilFormula().getRightSubformula())->asExplicitQualitativeCheckResult().getTruthValuesVector();
absorbingStatesForSubformula = storm::utility::graph::performProb0A(backwardTransitions, lhs, rhs);
absorbingStatesForSubformula |= getOnlyReachableViaPhi(*model, ~lhs | rhs);
}
} else if (pathFormula.isGloballyFormula()){
auto phi = mc.check(pathFormula.asGloballyFormula().getSubformula())->asExplicitQualitativeCheckResult().getTruthValuesVector();
auto notPhi = ~phi;
absorbingStatesForSubformula = storm::utility::graph::performProb0A(backwardTransitions, phi, notPhi);
absorbingStatesForSubformula |= getOnlyReachableViaPhi(*model, notPhi);
} else if (pathFormula.isEventuallyFormula()){
auto phi = mc.check(pathFormula.asEventuallyFormula().getSubformula())->asExplicitQualitativeCheckResult().getTruthValuesVector();
absorbingStatesForSubformula = storm::utility::graph::performProb0A(backwardTransitions, ~phi, phi);
absorbingStatesForSubformula |= getOnlyReachableViaPhi(*model, phi);
} else {
STORM_LOG_THROW(false, storm::exceptions::InvalidPropertyException, "The subformula of " << pathFormula << " is not supported.");
}
} else if (opFormula->isRewardOperatorFormula()) {
auto const& baseRewardModel = opFormula->asRewardOperatorFormula().hasRewardModelName() ? model->getRewardModel(opFormula->asRewardOperatorFormula().getRewardModelName()) : model->getUniqueRewardModel();
if (pathFormula.isEventuallyFormula()) {
auto rewardModel = storm::utility::createFilteredRewardModel(baseRewardModel, model->isDiscreteTimeModel(), pathFormula.asEventuallyFormula());
storm::storage::BitVector statesWithoutReward = rewardModel.get().getStatesWithZeroReward(model->getTransitionMatrix());
absorbingStatesForSubformula = storm::utility::graph::performProb0A(backwardTransitions, statesWithoutReward, ~statesWithoutReward);
auto phi = mc.check(pathFormula.asEventuallyFormula().getSubformula())->asExplicitQualitativeCheckResult().getTruthValuesVector();
absorbingStatesForSubformula |= storm::utility::graph::performProb1A(model->getTransitionMatrix(), model->getTransitionMatrix().getRowGroupIndices(), backwardTransitions, statesWithoutReward, phi);
absorbingStatesForSubformula |= getOnlyReachableViaPhi(*model, phi);
} else if (pathFormula.isCumulativeRewardFormula()) {
auto rewardModel = storm::utility::createFilteredRewardModel(baseRewardModel, model->isDiscreteTimeModel(), pathFormula.asCumulativeRewardFormula());
storm::storage::BitVector statesWithoutReward = rewardModel.get().getStatesWithZeroReward(model->getTransitionMatrix());
absorbingStatesForSubformula = storm::utility::graph::performProb0A(backwardTransitions, statesWithoutReward, ~statesWithoutReward);
} else if (pathFormula.isTotalRewardFormula()) {
auto rewardModel = storm::utility::createFilteredRewardModel(baseRewardModel, model->isDiscreteTimeModel(), pathFormula.asCumulativeRewardFormula());
storm::storage::BitVector statesWithoutReward = rewardModel.get().getStatesWithZeroReward(model->getTransitionMatrix());
absorbingStatesForSubformula = storm::utility::graph::performProb0A(backwardTransitions, statesWithoutReward, ~statesWithoutReward);
} else {
STORM_LOG_THROW(false, storm::exceptions::InvalidPropertyException, "The subformula of " << pathFormula << " is not supported.");
}
} else if (opFormula->isTimeOperatorFormula()) {
if (pathFormula.isEventuallyFormula()){
auto phi = mc.check(pathFormula.asEventuallyFormula().getSubformula())->asExplicitQualitativeCheckResult().getTruthValuesVector();
absorbingStatesForSubformula |= getOnlyReachableViaPhi(*model, phi);
} else {
STORM_LOG_THROW(false, storm::exceptions::InvalidPropertyException, "The subformula of " << pathFormula << " is not supported.");
}
} else {
STORM_LOG_THROW(false, storm::exceptions::InvalidPropertyException, "Could not preprocess the subformula " << *opFormula << " of " << originalFormula << " because it is not supported");
}
absorbingStates &= absorbingStatesForSubformula;
if (absorbingStates.empty()) {
break;
}
}
if (!absorbingStates.empty()) {
// We can make the states absorbing and delete unreachable states.
storm::storage::BitVector subsystemActions(model->getNumberOfChoices(), true);
for (auto const& absorbingState : absorbingStates) {
for (uint64_t action = model->getTransitionMatrix().getRowGroupIndices()[absorbingState]; action < model->getTransitionMatrix().getRowGroupIndices()[absorbingState + 1]; ++action) {
subsystemActions.set(action, false);
}
}
storm::transformer::SubsystemBuilderOptions options;
options.fixDeadlocks = true;
auto const& submodel = storm::transformer::buildSubsystem(*model, storm::storage::BitVector(model->getNumberOfStates(), true), subsystemActions, false, options);
STORM_LOG_INFO("Making states absorbing reduced the state space from " << model->getNumberOfStates() << " to " << submodel.model->getNumberOfStates() << ".");
model = submodel.model->template as<SparseModelType>();
}
}
template <typename SparseModelType>
SparseMultiObjectivePreprocessor<SparseModelType>::PreprocessorData::PreprocessorData(std::shared_ptr<SparseModelType> model) : model(model) {

25
src/storm/modelchecker/multiobjective/preprocessing/SparseMultiObjectivePreprocessor.h
View File

@ -50,6 +50,11 @@ namespace storm {
PreprocessorData(std::shared_ptr<SparseModelType> model);
};
/*!
* Removes states that are irrelevant for all objectives, e.g., because they are only reachable via goal states.
*/
static void removeIrrelevantStates(std::shared_ptr<SparseModelType>& model, storm::logic::MultiObjectiveFormula const& originalFormula);
/*!
* Apply the neccessary preprocessing for the given formula.
* @param formula the current (sub)formula
@ -78,26 +83,6 @@ namespace storm {
* Returns the query type
*/
static typename ReturnType::QueryType getQueryType(std::vector<Objective<ValueType>> const& objectives);
/*!
* Computes the set of states that have zero expected reward w.r.t. all expected reward objectives
*/
static void setReward0States(ReturnType& result, storm::storage::SparseMatrix<ValueType> const& backwardTransitions);
/*!
* Checks whether the occurring expected rewards are finite and sets the RewardFinitenessType accordingly
* Returns the set of states for which a scheduler exists that induces finite reward for all objectives
*/
static void checkRewardFiniteness(ReturnType& result, storm::storage::BitVector const& finiteRewardCheckObjectives, storm::storage::SparseMatrix<ValueType> const& backwardTransitions);
/*!
* Finds an upper bound for the expected reward of the objective with the given index (assuming it considers an expected reward objective)
*/
static boost::optional<ValueType> computeUpperResultBound(ReturnType const& result, uint64_t objIndex, storm::storage::SparseMatrix<ValueType> const& backwardTransitions);
};
}

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