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@ -578,27 +578,40 @@ namespace storm { |
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std::unique_ptr<CheckResult> SparseDtmcEliminationModelChecker<SparseDtmcModelType>::computeReachabilityRewards(storm::logic::ReachabilityRewardFormula const& rewardPathFormula, boost::optional<std::string> const& rewardModelName, bool qualitative, boost::optional<OptimizationDirection> const& optimalityType) { |
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// Retrieve the appropriate bitvectors by model checking the subformulas.
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std::unique_ptr<CheckResult> subResultPointer = this->check(rewardPathFormula.getSubformula()); |
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storm::storage::BitVector phiStates(this->getModel().getNumberOfStates(), true); |
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storm::storage::BitVector const& psiStates = subResultPointer->asExplicitQualitativeCheckResult().getTruthValuesVector(); |
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storm::storage::BitVector targetStates = subResultPointer->asExplicitQualitativeCheckResult().getTruthValuesVector(); |
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storm::storage::BitVector trueStates(this->getModel().getNumberOfStates(), true); |
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// Do some sanity checks to establish some required properties.
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RewardModelType const& rewardModel = this->getModel().getRewardModel(rewardModelName ? rewardModelName.get() : ""); |
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std::vector<ValueType> stateRewardValues = rewardModel.getTotalRewardVector(trueStates.getNumberOfSetBits(), this->getModel().getTransitionMatrix(), trueStates); |
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STORM_LOG_THROW(!rewardModel.empty(), storm::exceptions::IllegalArgumentException, "Input model does not have a reward model."); |
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std::vector<ValueType> result = computeReachabilityRewards(this->getModel().getTransitionMatrix(), this->getModel().getBackwardTransitions(), this->getModel().getInitialStates(), targetStates, stateRewardValues, this->computeResultsForInitialStatesOnly, qualitative, optimalityType); |
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// Construct check result
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std::unique_ptr<CheckResult> checkResult(new ExplicitQuantitativeCheckResult<ValueType>(result)); |
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return checkResult; |
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} |
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template<typename SparseDtmcModelType> |
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std::vector<typename SparseDtmcModelType::ValueType> SparseDtmcEliminationModelChecker<SparseDtmcModelType>::computeReachabilityRewards(storm::storage::SparseMatrix<ValueType> const& probabilityMatrix, storm::storage::SparseMatrix<ValueType> const& backwardTransitions, storm::storage::BitVector const& initialStates, storm::storage::BitVector const& targetStates, std::vector<ValueType> const& stateRewardValues, bool computeForInitialStatesOnly, bool qualitative, boost::optional<OptimizationDirection> const& optimalityType) { |
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uint_fast64_t numberOfStates = probabilityMatrix.getRowCount(); |
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// Then, compute the subset of states that has a reachability reward less than infinity.
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storm::storage::BitVector trueStates(this->getModel().getNumberOfStates(), true); |
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storm::storage::BitVector infinityStates = storm::utility::graph::performProb1(this->getModel().getBackwardTransitions(), trueStates, psiStates); |
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// Compute the subset of states that has a reachability reward less than infinity.
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storm::storage::BitVector trueStates(numberOfStates, true); |
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storm::storage::BitVector infinityStates = storm::utility::graph::performProb1(backwardTransitions, trueStates, targetStates); |
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infinityStates.complement(); |
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storm::storage::BitVector maybeStates = ~psiStates & ~infinityStates; |
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storm::storage::BitVector maybeStates = ~targetStates & ~infinityStates; |
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// Determine whether we need to perform some further computation.
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bool furtherComputationNeeded = true; |
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if (computeResultsForInitialStatesOnly) { |
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if (this->getModel().getInitialStates().isSubsetOf(infinityStates)) { |
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if (computeForInitialStatesOnly) { |
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if (initialStates.isSubsetOf(infinityStates)) { |
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STORM_LOG_DEBUG("The reward of all initial states was found in a preprocessing step."); |
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furtherComputationNeeded = false; |
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} |
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if (this->getModel().getInitialStates().isSubsetOf(psiStates)) { |
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if (initialStates.isSubsetOf(targetStates)) { |
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STORM_LOG_DEBUG("The reward of all initial states was found in a preprocessing step."); |
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furtherComputationNeeded = false; |
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} |
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@ -608,40 +621,37 @@ namespace storm { |
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if (furtherComputationNeeded) { |
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// If we compute the results for the initial states only, we can cut off all maybe state that are not
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// reachable from them.
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if (computeResultsForInitialStatesOnly) { |
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if (computeForInitialStatesOnly) { |
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// Determine the set of states that is reachable from the initial state without jumping over a target state.
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storm::storage::BitVector reachableStates = storm::utility::graph::getReachableStates(this->getModel().getTransitionMatrix(), this->getModel().getInitialStates(), maybeStates, psiStates); |
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storm::storage::BitVector reachableStates = storm::utility::graph::getReachableStates(probabilityMatrix, initialStates, maybeStates, targetStates); |
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// Subtract from the maybe states the set of states that is not reachable (on a path from the initial to a target state).
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maybeStates &= reachableStates; |
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} |
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// Determine the set of initial states of the sub-model.
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storm::storage::BitVector newInitialStates = this->getModel().getInitialStates() % maybeStates; |
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storm::storage::BitVector newInitialStates = initialStates % maybeStates; |
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// We then build the submatrix that only has the transitions of the maybe states.
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storm::storage::SparseMatrix<ValueType> submatrix = this->getModel().getTransitionMatrix().getSubmatrix(false, maybeStates, maybeStates); |
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storm::storage::SparseMatrix<ValueType> submatrix = probabilityMatrix.getSubmatrix(false, maybeStates, maybeStates); |
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storm::storage::SparseMatrix<ValueType> submatrixTransposed = submatrix.transpose(); |
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// Project the state reward vector to all maybe-states.
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std::vector<ValueType> stateRewardValues = rewardModel.getTotalRewardVector(maybeStates.getNumberOfSetBits(), this->getModel().getTransitionMatrix(), maybeStates); |
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std::vector<ValueType> subresult = computeReachabilityValues(submatrix, stateRewardValues, submatrixTransposed, newInitialStates, computeResultsForInitialStatesOnly, phiStates, psiStates, this->getModel().getTransitionMatrix().getConstrainedRowSumVector(maybeStates, psiStates)); |
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std::vector<ValueType> rewardValues = storm::utility::vector::filterVector(stateRewardValues, maybeStates); |
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storm::storage::BitVector phiStates(numberOfStates, true); |
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std::vector<ValueType> subresult = computeReachabilityValues(submatrix, rewardValues, submatrixTransposed, newInitialStates, computeForInitialStatesOnly, phiStates, targetStates, probabilityMatrix.getConstrainedRowSumVector(maybeStates, targetStates)); |
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storm::utility::vector::setVectorValues<ValueType>(result, maybeStates, subresult); |
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} |
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// Construct full result.
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storm::utility::vector::setVectorValues<ValueType>(result, infinityStates, storm::utility::infinity<ValueType>()); |
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storm::utility::vector::setVectorValues<ValueType>(result, psiStates, storm::utility::zero<ValueType>()); |
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// Construct check result based on whether we have computed values for all states or just the initial states.
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std::unique_ptr<CheckResult> checkResult(new ExplicitQuantitativeCheckResult<ValueType>(result)); |
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if (computeResultsForInitialStatesOnly) { |
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storm::utility::vector::setVectorValues<ValueType>(result, targetStates, storm::utility::zero<ValueType>()); |
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if (computeForInitialStatesOnly) { |
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// If we computed the results for the initial (and inf) states only, we need to filter the result to
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// only communicate these results.
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checkResult->filter(ExplicitQualitativeCheckResult(~maybeStates | this->getModel().getInitialStates())); |
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result = storm::utility::vector::filterVector(result, ~maybeStates | initialStates); |
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} |
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return checkResult; |
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return result; |
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} |
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template<typename SparseDtmcModelType> |
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Mavo
9 years ago