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code skeleton for multi-dimensional reward unfolding

main
TimQu 8 years ago
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63917eb073
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7c23aab43c
4 changed files with 206 additions and 61 deletions
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  1. 67
      src/storm/modelchecker/multiobjective/pcaa/SparseMdpPcaaWeightVectorChecker.cpp
  2. 14
      src/storm/modelchecker/multiobjective/pcaa/SparseMdpPcaaWeightVectorChecker.h
  3. 108
      src/storm/modelchecker/multiobjective/rewardbounded/MultiDimensionalRewardUnfolding.cpp
  4. 74
      src/storm/modelchecker/multiobjective/rewardbounded/MultiDimensionalRewardUnfolding.h

67
src/storm/modelchecker/multiobjective/pcaa/SparseMdpPcaaWeightVectorChecker.cpp
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@ -115,60 +115,31 @@ namespace storm {
}
}
template <class SparseMdpModelType>
void SparseMdpPcaaWeightVectorChecker<SparseMdpModelType>::boundedPhaseWithRewardBounds(std::vector<ValueType> const& weightVector, std::vector<ValueType>& weightedRewardVector) {
STORM_LOG_THROW(false, storm::exceptions::NotSupportedException, "Multi-objective model checking with reward bounded objectives is not supported.");
}
template<class SparseModelType>
void SparseMdpPcaaWeightVectorChecker<SparseModelType>::discretizeRewardBounds() {
if (!rewardUnfolding) {
rewardUnfolding = std::make_unique<MultiDimensionalRewardUnfolding<ValueType>>(this->model, this->objectives, this->possibleECActions, this->possibleBottomStates);
}
auto initEpoch = rewardUnfolding->getStartEpoch();
auto epochOrder = rewardUnfolding->getEpochComputationOrder(initEpoch);
for (auto const& epoch : epochOrder) {
computeEpochSolution(epoch, weightVector);
}
std::map<std::string, uint_fast64_t> rewardModelNameToDimension;
objIndexToRewardDimensionMapping = std::vector<uint_fast64_t>(this->objectives.size(), std::numeric_limits<uint_fast64_t>::max());
auto solution = rewardUnfolding->getEpochSolution(initEpoch);
this->weightedResult = solution.weightedValues;
this->objectiveResults = solution.objectiveValues;
// Collect the reward models that occur as reward bound
uint_fast64_t dimensionCount = 0;
for (uint_fast64_t objIndex = 0; objIndex < this->objectives.size(); ++objIndex) {
auto const& obj = this->objectives[objIndex];
if (obj.timeBoundReference && obj.timeBoundReference->isRewardBound()) {
auto insertionRes = rewardModelNameToDimension.insert(std::make_pair(obj.timeBoundReference->getRewardName(), dimensionCount));
objIndexToRewardDimensionMapping[objIndex] = insertionRes.first->second;
if (insertionRes.second) {
++dimensionCount;
}
}
for (uint64_t objIndex = 0; objIndex < this->objectives.size(); ++objIndex) {
// Todo: we currently assume precise results...
this->offsetsToUnderApproximation[objIndex] = storm::utility::zero<ValueType>();
this->offsetsToOverApproximation[objIndex] = storm::utility::zero<ValueType>();
}
}
// Now discretize each reward
discretizedActionRewards.reserve(dimensionCount);
discretizedRewardBounds = std::vector<uint_fast64_t>(this->objectives.size(), 0);
for (auto const& rewardName : rewardModelNameToDimension) {
STORM_LOG_THROW(this->model.hasRewardModel(rewardName.first), storm::exceptions::IllegalArgumentException, "No reward model with name '" << rewardName.first << "' found.");
auto const& rewardModel = this->model.getRewardModel(rewardName.first);
STORM_LOG_THROW(!rewardModel.hasTransitionRewards(), storm::exceptions::NotSupportedException, "Transition rewards are currently not supported.");
std::vector<typename RewardModelType::ValueType> actionRewards = rewardModel.getTotalRewardVector(this->model.getTransitionMatrix());
auto discretizedRewardsAndFactor = storm::utility::vector::toIntegralVector<typename RewardModelType::ValueType, uint_fast64_t>(actionRewards);
discretizedActionRewards.push_back(std::move(discretizedRewardsAndFactor.first));
// Find all objectives that reffer to this reward model and apply the discretization factor to the reward bounds
for (uint_fast64_t objIndex = 0; objIndex < objIndexToRewardDimensionMapping.size(); ++objIndex) {
if (objIndexToRewardDimensionMapping[objIndex] == rewardName.second) {
auto const& obj = this->objectives[objIndex];
STORM_LOG_THROW(!obj.lowerTimeBound, storm::exceptions::NotSupportedException, "Lower time bounds are not supported.");
STORM_LOG_THROW(obj.upperTimeBound, storm::exceptions::UnexpectedException, "Got formula with a bound reference but no bound.");
STORM_LOG_THROW(!obj.upperTimeBound->getBound().containsVariables(), storm::exceptions::UnexpectedException, "The upper bound of a reward bounded formula still contains variables.");
typename RewardModelType::ValueType discretizedBound = storm::utility::convertNumber<typename RewardModelType::ValueType>(obj.upperTimeBound->getBound().evaluateAsRational());
discretizedBound /= discretizedRewardsAndFactor.second;
if (obj.upperTimeBound->isStrict() && discretizedBound == storm::utility::floor(discretizedBound)) {
discretizedBound = storm::utility::floor(discretizedBound) - storm::utility::one<ValueType>();
} else {
discretizedBound = storm::utility::floor(discretizedBound);
}
discretizedRewardBounds[objIndex] = storm::utility::convertNumber<uint_fast64_t>(discretizedBound);
}
}
}
template <class SparseMdpModelType>
void SparseMdpPcaaWeightVectorChecker<SparseMdpModelType>::computeEpochSolution(typename MultiDimensionalRewardUnfolding<ValueType>::Epoch const& epoch, std::vector<ValueType> const& weightVector) {
// TODO
}

14
src/storm/modelchecker/multiobjective/pcaa/SparseMdpPcaaWeightVectorChecker.h
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@ -4,6 +4,7 @@
#include <vector>
#include "storm/modelchecker/multiobjective/pcaa/SparsePcaaWeightVectorChecker.h"
#include "storm/modelchecker/multiobjective/rewardbounded/MultiDimensionalRewardUnfolding.h"
namespace storm {
namespace modelchecker {
@ -65,18 +66,9 @@ namespace storm {
*/
void boundedPhaseWithRewardBounds(std::vector<ValueType> const& weightVector, std::vector<ValueType>& weightedRewardVector);
void computeEpochSolution(typename MultiDimensionalRewardUnfolding<ValueType>::Epoch const& epoch, std::vector<ValueType> const& weightVector);
/*!
* Discretizes the reward models that occurr at some bounded formula
*/
void discretizeRewardBounds();
std::vector<uint64_t> objIndexToRewardDimensionMapping;
std::vector<std::vector<uint64_t>> discretizedActionRewards;
std::vector<uint64_t> discretizedRewardBounds;
std::unique_ptr<MultiDimensionalRewardUnfolding<ValueType>> rewardUnfolding;
};

108
src/storm/modelchecker/multiobjective/rewardbounded/MultiDimensionalRewardUnfolding.cpp
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@ -0,0 +1,108 @@
#include "storm/modelchecker/multiobjective/rewardbounded/MultiDimensionalRewardUnfolding.h"
namespace storm {
namespace modelchecker {
namespace multiobjective {
template<typename ValueType>
MultiDimensionalRewardUnfolding<ValueType>::MultiDimensionalRewardUnfolding(storm::models::sparse::Mdp<ValueType> const& model, std::vector<storm::modelchecker::multiobjective::Objective<ValueType>> const& objectives, storm::storage::BitVector const& possibleECActions, storm::storage::BitVector const& allowedBottomStates) : model(model), objectives(objectives), possibleECActions(possibleECActions), allowedBottomStates(allowedBottomStates) {
}
template<typename ValueType>
typename MultiDimensionalRewardUnfolding<ValueType>::Epoch MultiDimensionalRewardUnfolding<ValueType>::getStartEpoch() {
return Epoch();
}
template<typename ValueType>
std::vector<typename MultiDimensionalRewardUnfolding<ValueType>::Epoch> MultiDimensionalRewardUnfolding<ValueType>::getEpochComputationOrder(Epoch const& startEpoch) {
return std::vector<Epoch>();
}
template<typename ValueType>
typename MultiDimensionalRewardUnfolding<ValueType>::EpochModel const& MultiDimensionalRewardUnfolding<ValueType>::getModelForEpoch(Epoch const& epoch) {
return EpochModel();
}
template<typename ValueType>
void MultiDimensionalRewardUnfolding<ValueType>::setEpochSolution(Epoch const& epoch, EpochSolution const& solution) {
}
template<typename ValueType>
void MultiDimensionalRewardUnfolding<ValueType>::setEpochSolution(Epoch const& epoch, EpochSolution&& solution) {
}
template<typename ValueType>
typename MultiDimensionalRewardUnfolding<ValueType>::EpochSolution const& MultiDimensionalRewardUnfolding<ValueType>::getEpochSolution(Epoch const& epoch) {
return EpochSolution();
}
template<typename ValueType>
typename MultiDimensionalRewardUnfolding<ValueType>::EpochClass MultiDimensionalRewardUnfolding<ValueType>::getClassOfEpoch(Epoch const& epoch) {
return 0;
}
/*
template<class SparseModelType>
void SparseMdpPcaaWeightVectorChecker<SparseModelType>::discretizeRewardBounds() {
std::map<std::string, uint_fast64_t> rewardModelNameToDimension;
objIndexToRewardDimensionMapping = std::vector<uint_fast64_t>(this->objectives.size(), std::numeric_limits<uint_fast64_t>::max());
// Collect the reward models that occur as reward bound
uint_fast64_t dimensionCount = 0;
for (uint_fast64_t objIndex = 0; objIndex < this->objectives.size(); ++objIndex) {
auto const& obj = this->objectives[objIndex];
if (obj.timeBoundReference && obj.timeBoundReference->isRewardBound()) {
auto insertionRes = rewardModelNameToDimension.insert(std::make_pair(obj.timeBoundReference->getRewardName(), dimensionCount));
objIndexToRewardDimensionMapping[objIndex] = insertionRes.first->second;
if (insertionRes.second) {
++dimensionCount;
}
}
}
// Now discretize each reward
discretizedActionRewards.reserve(dimensionCount);
discretizedRewardBounds = std::vector<uint_fast64_t>(this->objectives.size(), 0);
for (auto const& rewardName : rewardModelNameToDimension) {
STORM_LOG_THROW(this->model.hasRewardModel(rewardName.first), storm::exceptions::IllegalArgumentException, "No reward model with name '" << rewardName.first << "' found.");
auto const& rewardModel = this->model.getRewardModel(rewardName.first);
STORM_LOG_THROW(!rewardModel.hasTransitionRewards(), storm::exceptions::NotSupportedException, "Transition rewards are currently not supported.");
std::vector<typename RewardModelType::ValueType> actionRewards = rewardModel.getTotalRewardVector(this->model.getTransitionMatrix());
auto discretizedRewardsAndFactor = storm::utility::vector::toIntegralVector<typename RewardModelType::ValueType, uint_fast64_t>(actionRewards);
discretizedActionRewards.push_back(std::move(discretizedRewardsAndFactor.first));
// Find all objectives that reffer to this reward model and apply the discretization factor to the reward bounds
for (uint_fast64_t objIndex = 0; objIndex < objIndexToRewardDimensionMapping.size(); ++objIndex) {
if (objIndexToRewardDimensionMapping[objIndex] == rewardName.second) {
auto const& obj = this->objectives[objIndex];
STORM_LOG_THROW(!obj.lowerTimeBound, storm::exceptions::NotSupportedException, "Lower time bounds are not supported.");
STORM_LOG_THROW(obj.upperTimeBound, storm::exceptions::UnexpectedException, "Got formula with a bound reference but no bound.");
STORM_LOG_THROW(!obj.upperTimeBound->getBound().containsVariables(), storm::exceptions::UnexpectedException, "The upper bound of a reward bounded formula still contains variables.");
typename RewardModelType::ValueType discretizedBound = storm::utility::convertNumber<typename RewardModelType::ValueType>(obj.upperTimeBound->getBound().evaluateAsRational());
discretizedBound /= discretizedRewardsAndFactor.second;
if (obj.upperTimeBound->isStrict() && discretizedBound == storm::utility::floor(discretizedBound)) {
discretizedBound = storm::utility::floor(discretizedBound) - storm::utility::one<ValueType>();
} else {
discretizedBound = storm::utility::floor(discretizedBound);
}
discretizedRewardBounds[objIndex] = storm::utility::convertNumber<uint_fast64_t>(discretizedBound);
}
}
}
}
*/
template class MultiDimensionalRewardUnfolding<double>;
template class MultiDimensionalRewardUnfolding<storm::RationalNumber>;
}
}
}

74
src/storm/modelchecker/multiobjective/rewardbounded/MultiDimensionalRewardUnfolding.h
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@ -0,0 +1,74 @@
#pragma once
#include "storm/storage/BitVector.h"
#include "storm/storage/SparseMatrix.h"
#include "storm/modelchecker/multiobjective/Objective.h"
#include "storm/models/sparse/Mdp.h"
#include "storm/utility/vector.h"
namespace storm {
namespace modelchecker {
namespace multiobjective {
template<typename ValueType>
class MultiDimensionalRewardUnfolding {
public:
struct EpochModel {
storm::storage::SparseMatrix<ValueType> rewardTransitions;
storm::storage::SparseMatrix<ValueType> intermediateTransitions;
std::vector<std::vector<ValueType>> objectiveRewards;
};
struct EpochSolution {
std::vector<ValueType> weightedValues;
std::vector<std::vector<ValueType>> objectiveValues;
};
typedef std::vector<uint64_t> Epoch; // The number of reward steps that are "left" for each dimension
typedef uint64_t EpochClass; // Collection of epochs that consider the same epoch model
/*
*
* @param model The (preprocessed) model
* @param objectives The (preprocessed) objectives
* @param possibleECActions Overapproximation of the actions that are part of an EC
* @param allowedBottomStates The states which are allowed to become a bottom state under a considered scheduler
*
*/
MultiDimensionalRewardUnfolding(storm::models::sparse::Mdp<ValueType> const& model,
std::vector<storm::modelchecker::multiobjective::Objective<ValueType>> const& objectives,
storm::storage::BitVector const& possibleECActions,
storm::storage::BitVector const& allowedBottomStates);
Epoch getStartEpoch();
std::vector<Epoch> getEpochComputationOrder(Epoch const& startEpoch);
EpochModel const& getModelForEpoch(Epoch const& epoch);
void setEpochSolution(Epoch const& epoch, EpochSolution const& solution);
void setEpochSolution(Epoch const& epoch, EpochSolution&& solution);
EpochSolution const& getEpochSolution(Epoch const& epoch);
private:
EpochClass getClassOfEpoch(Epoch const& epoch);
storm::models::sparse::Mdp<ValueType> const& model;
std::vector<storm::modelchecker::multiobjective::Objective<ValueType>> const& objectives;
storm::storage::BitVector possibleECActions;
storm::storage::BitVector allowedBottomStates;
std::vector<std::pair<std::shared_ptr<storm::logic::Formula const>, uint64_t>> subObjectives;
std::vector<std::vector<uint64_t>> scaledRewards;
std::vector<ValueType> scalingFactors;
std::map<EpochClass, EpochModel> epochModels;
std::map<Epoch, EpochSolution> epochSolutions;
};
}
}
}
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