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Small bugfix for bisimulation decomposition. 

Former-commit-id: eae1447df4
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dehnert 11 years ago
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72c178dd08
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f3048d31c2
2 changed files with 22 additions and 18 deletions
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  1. 32
      src/storage/DeterministicModelBisimulationDecomposition.cpp
  2. 8
      src/storage/DeterministicModelBisimulationDecomposition.h

32
src/storage/DeterministicModelBisimulationDecomposition.cpp
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@ -579,16 +579,18 @@ namespace storm {
DeterministicModelBisimulationDecomposition<ValueType>::DeterministicModelBisimulationDecomposition(storm::models::Dtmc<ValueType> const& model, bool weak, bool buildQuotient) : comparator() {
STORM_LOG_THROW(!model.hasStateRewards() && !model.hasTransitionRewards(), storm::exceptions::IllegalFunctionCallException, "Bisimulation is currently only supported for models without reward structures.");
storm::storage::SparseMatrix<ValueType> backwardTransitions = model.getBackwardTransitions();
Partition initialPartition = getLabelBasedInitialPartition(model, backwardTransitions, weak);
partitionRefinement(model, backwardTransitions, initialPartition, weak ? BisimulationType::WeakDtmc : BisimulationType::Strong, buildQuotient);
BisimulationType bisimulationType = weak ? BisimulationType::WeakDtmc : BisimulationType::Strong;
Partition initialPartition = getLabelBasedInitialPartition(model, backwardTransitions, bisimulationType);
partitionRefinement(model, backwardTransitions, initialPartition, bisimulationType, buildQuotient);
}
template<typename ValueType>
DeterministicModelBisimulationDecomposition<ValueType>::DeterministicModelBisimulationDecomposition(storm::models::Ctmc<ValueType> const& model, bool weak, bool buildQuotient) {
STORM_LOG_THROW(!model.hasStateRewards() && !model.hasTransitionRewards(), storm::exceptions::IllegalFunctionCallException, "Bisimulation is currently only supported for models without reward structures.");
storm::storage::SparseMatrix<ValueType> backwardTransitions = model.getBackwardTransitions();
Partition initialPartition = getLabelBasedInitialPartition(model, backwardTransitions, weak);
partitionRefinement(model, backwardTransitions, initialPartition, weak ? BisimulationType::WeakCtmc : BisimulationType::Strong, buildQuotient);
BisimulationType bisimulationType = weak ? BisimulationType::WeakCtmc : BisimulationType::Strong;
Partition initialPartition = getLabelBasedInitialPartition(model, backwardTransitions, bisimulationType);
partitionRefinement(model, backwardTransitions, initialPartition, bisimulationType, buildQuotient);
}
template<typename ValueType>
@ -596,8 +598,9 @@ namespace storm {
STORM_LOG_THROW(!model.hasStateRewards() && !model.hasTransitionRewards(), storm::exceptions::IllegalFunctionCallException, "Bisimulation is currently only supported for models without reward structures.");
STORM_LOG_THROW(!weak || !bounded, storm::exceptions::IllegalFunctionCallException, "Weak bisimulation does not preserve bounded properties.");
storm::storage::SparseMatrix<ValueType> backwardTransitions = model.getBackwardTransitions();
Partition initialPartition = getMeasureDrivenInitialPartition(model, backwardTransitions, phiLabel, psiLabel, weak, bounded);
partitionRefinement(model, model.getBackwardTransitions(), initialPartition, weak ? BisimulationType::WeakDtmc : BisimulationType::Strong, buildQuotient);
BisimulationType bisimulationType = weak ? BisimulationType::WeakDtmc : BisimulationType::Strong;
Partition initialPartition = getMeasureDrivenInitialPartition(model, backwardTransitions, phiLabel, psiLabel, bisimulationType, bounded);
partitionRefinement(model, model.getBackwardTransitions(), initialPartition, bisimulationType, buildQuotient);
}
template<typename ValueType>
@ -605,8 +608,9 @@ namespace storm {
STORM_LOG_THROW(!model.hasStateRewards() && !model.hasTransitionRewards(), storm::exceptions::IllegalFunctionCallException, "Bisimulation is currently only supported for models without reward structures.");
STORM_LOG_THROW(!weak || !bounded, storm::exceptions::IllegalFunctionCallException, "Weak bisimulation does not preserve bounded properties.");
storm::storage::SparseMatrix<ValueType> backwardTransitions = model.getBackwardTransitions();
Partition initialPartition = getMeasureDrivenInitialPartition(model, backwardTransitions, phiLabel, psiLabel, weak, bounded);
partitionRefinement(model, model.getBackwardTransitions(), initialPartition, weak ? BisimulationType::WeakCtmc : BisimulationType::Strong, buildQuotient);
BisimulationType bisimulationType = weak ? BisimulationType::WeakCtmc : BisimulationType::Strong;
Partition initialPartition = getMeasureDrivenInitialPartition(model, backwardTransitions, phiLabel, psiLabel, bisimulationType, bounded);
partitionRefinement(model, model.getBackwardTransitions(), initialPartition, bisimulationType, buildQuotient);
}
template<typename ValueType>
@ -1177,13 +1181,13 @@ namespace storm {
template<typename ValueType>
template<typename ModelType>
typename DeterministicModelBisimulationDecomposition<ValueType>::Partition DeterministicModelBisimulationDecomposition<ValueType>::getMeasureDrivenInitialPartition(ModelType const& model, storm::storage::SparseMatrix<ValueType> const& backwardTransitions, std::string const& phiLabel, std::string const& psiLabel, bool weak, bool bounded) {
typename DeterministicModelBisimulationDecomposition<ValueType>::Partition DeterministicModelBisimulationDecomposition<ValueType>::getMeasureDrivenInitialPartition(ModelType const& model, storm::storage::SparseMatrix<ValueType> const& backwardTransitions, std::string const& phiLabel, std::string const& psiLabel, BisimulationType bisimulationType, bool bounded) {
std::pair<storm::storage::BitVector, storm::storage::BitVector> statesWithProbability01 = storm::utility::graph::performProb01(backwardTransitions, phiLabel == "true" ? storm::storage::BitVector(model.getNumberOfStates(), true) : model.getLabeledStates(phiLabel), model.getLabeledStates(psiLabel));
Partition partition(model.getNumberOfStates(), statesWithProbability01.first, bounded ? model.getLabeledStates(psiLabel) : statesWithProbability01.second, phiLabel, psiLabel);
Partition partition(model.getNumberOfStates(), statesWithProbability01.first, bounded ? model.getLabeledStates(psiLabel) : statesWithProbability01.second, phiLabel, psiLabel, bisimulationType == BisimulationType::WeakDtmc);
// If we are creating the initial partition for weak bisimulation, we need to (a) split off all divergent
// states of each initial block and (b) initialize the vector of silent probabilities held by the partition.
if (weak) {
if (bisimulationType == BisimulationType::WeakDtmc) {
this->splitOffDivergentStates(model, backwardTransitions, partition);
this->initializeSilentProbabilities(model, partition);
}
@ -1261,8 +1265,8 @@ namespace storm {
template<typename ValueType>
template<typename ModelType>
typename DeterministicModelBisimulationDecomposition<ValueType>::Partition DeterministicModelBisimulationDecomposition<ValueType>::getLabelBasedInitialPartition(ModelType const& model, storm::storage::SparseMatrix<ValueType> const& backwardTransitions, bool weak) {
Partition partition(model.getNumberOfStates(), weak);
typename DeterministicModelBisimulationDecomposition<ValueType>::Partition DeterministicModelBisimulationDecomposition<ValueType>::getLabelBasedInitialPartition(ModelType const& model, storm::storage::SparseMatrix<ValueType> const& backwardTransitions, BisimulationType bisimulationType) {
Partition partition(model.getNumberOfStates(), bisimulationType == BisimulationType::WeakDtmc);
for (auto const& label : model.getStateLabeling().getAtomicPropositions()) {
if (label == "init") {
continue;
@ -1272,7 +1276,7 @@ namespace storm {
// If we are creating the initial partition for weak bisimulation, we need to (a) split off all divergent
// states of each initial block and (b) initialize the vector of silent probabilities held by the partition.
if (weak) {
if (bisimulationType == BisimulationType::WeakDtmc) {
this->splitOffDivergentStates(model, backwardTransitions, partition);
this->initializeSilentProbabilities(model, partition);
}

8
src/storage/DeterministicModelBisimulationDecomposition.h
View File

@ -460,24 +460,24 @@ namespace storm {
* @param backwardTransitions The backward transitions of the model.
* @param phiLabel The label that all phi states carry in the model.
* @param psiLabel The label that all psi states carry in the model.
* @param weak A flag indicating whether a weak bisimulation is to be computed.
* @param bisimulationType The kind of bisimulation that is to be computed.
* @param bounded If set to true, the initial partition will be chosen in such a way that preserves bounded
* reachability queries.
* @return The resulting partition.
*/
template<typename ModelType>
Partition getMeasureDrivenInitialPartition(ModelType const& model, storm::storage::SparseMatrix<ValueType> const& backwardTransitions, std::string const& phiLabel, std::string const& psiLabel, bool weak, bool bounded = false);
Partition getMeasureDrivenInitialPartition(ModelType const& model, storm::storage::SparseMatrix<ValueType> const& backwardTransitions, std::string const& phiLabel, std::string const& psiLabel, BisimulationType bisimulationType, bool bounded = false);
/*!
* Creates the initial partition based on all the labels in the given model.
*
* @param model The model whose state space is partitioned based on its labels.
* @param backwardTransitions The backward transitions of the model.
* @param weak A flag indicating whether a weak bisimulation is to be computed.
* @param bisimulationType The kind of bisimulation that is to be computed.
* @return The resulting partition.
*/
template<typename ModelType>
Partition getLabelBasedInitialPartition(ModelType const& model, storm::storage::SparseMatrix<ValueType> const& backwardTransitions, bool weak);
Partition getLabelBasedInitialPartition(ModelType const& model, storm::storage::SparseMatrix<ValueType> const& backwardTransitions, BisimulationType bisimulationType);
/*!
* Splits all blocks of the given partition into a block that contains all divergent states and another block

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