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Improved product of model and memory structure: We can now enforce that certain states are considered reachable.

main
TimQu 8 years ago
parent
9bccae9c5c
commit
43642fef84
2 changed files with 56 additions and 36 deletions
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  1. 31
      src/storm/storage/memorystructure/SparseModelMemoryProduct.cpp
  2. 21
      src/storm/storage/memorystructure/SparseModelMemoryProduct.h

31
src/storm/storage/memorystructure/SparseModelMemoryProduct.cpp
View File

@ -19,9 +19,21 @@ namespace storm {
template <typename ValueType>
SparseModelMemoryProduct<ValueType>::SparseModelMemoryProduct(storm::models::sparse::Model<ValueType> const& sparseModel, storm::storage::MemoryStructure const& memoryStructure) : model(sparseModel), memory(memoryStructure) {
// intentionally left empty
reachableStates = storm::storage::BitVector(model.getNumberOfStates() * memory.getNumberOfStates(), false);
}
template <typename ValueType>
void SparseModelMemoryProduct<ValueType>::addReachableState(uint64_t const& modelState, uint64_t const& memoryState) {
reachableStates.set(modelState * memory.getNumberOfStates() + memoryState, true);
}
template <typename ValueType>
void SparseModelMemoryProduct<ValueType>::setBuildFullProduct() {
reachableStates.clear();
reachableStates.complement();
}
template <typename ValueType>
std::shared_ptr<storm::models::sparse::Model<ValueType>> SparseModelMemoryProduct<ValueType>::build() {
uint64_t modelStateCount = model.getNumberOfStates();
@ -38,7 +50,7 @@ namespace storm {
}
STORM_LOG_ASSERT(memoryInitIt == memory.getInitialMemoryStates().end(), "Unexpected number of initial states.");
storm::storage::BitVector reachableStates = computeReachableStates(memorySuccessors, initialStates);
computeReachableStates(memorySuccessors, initialStates);
// Compute the mapping to the states of the result
uint64_t reachableStateCount = 0;
@ -50,8 +62,8 @@ namespace storm {
// Build the model components
storm::storage::SparseMatrix<ValueType> transitionMatrix = model.getTransitionMatrix().hasTrivialRowGrouping() ?
buildDeterministicTransitionMatrix(reachableStates, memorySuccessors) :
buildNondeterministicTransitionMatrix(reachableStates, memorySuccessors);
buildDeterministicTransitionMatrix(memorySuccessors) :
buildNondeterministicTransitionMatrix(memorySuccessors);
storm::models::sparse::StateLabeling labeling = buildStateLabeling(transitionMatrix);
std::unordered_map<std::string, storm::models::sparse::StandardRewardModel<ValueType>> rewardModels = buildRewardModels(transitionMatrix, memorySuccessors);
@ -88,11 +100,12 @@ namespace storm {
}
template <typename ValueType>
storm::storage::BitVector SparseModelMemoryProduct<ValueType>::computeReachableStates(std::vector<uint64_t> const& memorySuccessors, storm::storage::BitVector const& initialStates) const {
void SparseModelMemoryProduct<ValueType>::computeReachableStates(std::vector<uint64_t> const& memorySuccessors, storm::storage::BitVector const& initialStates) {
uint64_t memoryStateCount = memory.getNumberOfStates();
// Explore the reachable states via DFS.
// A state s on the stack corresponds to the model state (s / memoryStateCount) and memory state (s % memoryStateCount)
storm::storage::BitVector reachableStates = initialStates;
reachableStates |= initialStates;
if (!reachableStates.full()) {
std::vector<uint64_t> stack(reachableStates.begin(), reachableStates.end());
while (!stack.empty()) {
uint64_t stateIndex = stack.back();
@ -114,11 +127,11 @@ namespace storm {
}
}
}
return reachableStates;
}
}
template <typename ValueType>
storm::storage::SparseMatrix<ValueType> SparseModelMemoryProduct<ValueType>::buildDeterministicTransitionMatrix(storm::storage::BitVector const& reachableStates, std::vector<uint64_t> const& memorySuccessors) const {
storm::storage::SparseMatrix<ValueType> SparseModelMemoryProduct<ValueType>::buildDeterministicTransitionMatrix(std::vector<uint64_t> const& memorySuccessors) const {
uint64_t memoryStateCount = memory.getNumberOfStates();
uint64_t numResStates = reachableStates.getNumberOfSetBits();
uint64_t numResTransitions = 0;
@ -144,7 +157,7 @@ namespace storm {
}
template <typename ValueType>
storm::storage::SparseMatrix<ValueType> SparseModelMemoryProduct<ValueType>::buildNondeterministicTransitionMatrix(storm::storage::BitVector const& reachableStates, std::vector<uint64_t> const& memorySuccessors) const {
storm::storage::SparseMatrix<ValueType> SparseModelMemoryProduct<ValueType>::buildNondeterministicTransitionMatrix(std::vector<uint64_t> const& memorySuccessors) const {
uint64_t memoryStateCount = memory.getNumberOfStates();
uint64_t numResStates = reachableStates.getNumberOfSetBits();
uint64_t numResChoices = 0;

21
src/storm/storage/memorystructure/SparseModelMemoryProduct.h
View File

@ -14,9 +14,7 @@ namespace storm {
/*!
* This class builds the product of the given sparse model and the given memory structure.
* This is similar to the well-known product of a model with a deterministic rabin automaton.
* Note: we already do one memory-structure-step for the initial state, i.e., if s is an initial state of
* the given model and s satisfies memoryStructure.getTransitionMatrix[0][n], then (s,n) will be the corresponding
* initial state of the resulting model.
* The product contains only the reachable states of the product
*
* The states of the resulting sparse model will have the original state labels plus the labels of this
* memory structure.
@ -28,11 +26,18 @@ namespace storm {
SparseModelMemoryProduct(storm::models::sparse::Model<ValueType> const& sparseModel, storm::storage::MemoryStructure const& memoryStructure);
// Enforces that the given model and memory state as well as the successor(s) are considered reachable -- even if they are not reachable from an initial state.
void addReachableState(uint64_t const& modelState, uint64_t const& memoryState);
// Enforces that every state is considered reachable. If this is set, the result has size #modelStates * #memoryStates
void setBuildFullProduct();
// Invokes the building of the product
std::shared_ptr<storm::models::sparse::Model<ValueType>> build();
// Retrieves the state of the resulting model that represents the given memory and model state.
// An invalid index is returned, if the specifyied state does not exist (i.e., if it is not reachable).
// Should only be called AFTER calling build();
// An invalid index is returned, if the specifyied state does not exist (i.e., if it is not part of product).
uint64_t const& getResultState(uint64_t const& modelState, uint64_t const& memoryState) const;
private:
@ -42,13 +47,13 @@ namespace storm {
std::vector<uint64_t> computeMemorySuccessors() const;
// Computes the reachable states of the resulting model
storm::storage::BitVector computeReachableStates(std::vector<uint64_t> const& memorySuccessors, storm::storage::BitVector const& initialStates) const;
void computeReachableStates(std::vector<uint64_t> const& memorySuccessors, storm::storage::BitVector const& initialStates);
// Methods that build the model components
// Matrix for deterministic models
storm::storage::SparseMatrix<ValueType> buildDeterministicTransitionMatrix(storm::storage::BitVector const& reachableStates, std::vector<uint64_t> const& memorySuccessors) const;
storm::storage::SparseMatrix<ValueType> buildDeterministicTransitionMatrix(std::vector<uint64_t> const& memorySuccessors) const;
// Matrix for nondeterministic models
storm::storage::SparseMatrix<ValueType> buildNondeterministicTransitionMatrix(storm::storage::BitVector const& reachableStates, std::vector<uint64_t> const& memorySuccessors) const;
storm::storage::SparseMatrix<ValueType> buildNondeterministicTransitionMatrix(std::vector<uint64_t> const& memorySuccessors) const;
// State labeling. Note: DOES NOT ADD A LABEL FOR THE INITIAL STATES
storm::models::sparse::StateLabeling buildStateLabeling(storm::storage::SparseMatrix<ValueType> const& resultTransitionMatrix) const;
// Reward models
@ -61,6 +66,8 @@ namespace storm {
// Maps (modelState * memoryStateCount) + memoryState to the state in the result that represents (memoryState,modelState)
std::vector<uint64_t> toResultStateMapping;
// Indicates which states are considered reachable. (s, m) is reachable if this BitVector is true at (s * memoryStateCount) + m
storm::storage::BitVector reachableStates;
storm::models::sparse::Model<ValueType> const& model;
storm::storage::MemoryStructure const& memory;

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