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fixed computeSchedulerProbGreater0E. 

Previously, it did not enforce that psiStates are actually reached. For instance, it was ok to chose a probability 1 selfloop.


Former-commit-id: 518a3b33a9
main
TimQu 10 years ago
parent
4bb4e29e43
commit
67cc067f35
2 changed files with 56 additions and 7 deletions
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  1. 44
      src/utility/graph.cpp
  2. 19
      src/utility/graph.h

44
src/utility/graph.cpp
View File

@ -310,8 +310,46 @@ namespace storm {
}
template <typename T>
storm::storage::PartialScheduler computeSchedulerProbGreater0E(storm::storage::BitVector const& probGreater0EStates, storm::storage::SparseMatrix<T> const& transitionMatrix) {
return computeSchedulerWithOneSuccessorInStates(probGreater0EStates, transitionMatrix);
storm::storage::PartialScheduler computeSchedulerProbGreater0E(storm::storage::SparseMatrix<T> const& transitionMatrix, storm::storage::SparseMatrix<T> const& backwardTransitions, storm::storage::BitVector const& phiStates, storm::storage::BitVector const& psiStates, boost::optional<storm::storage::BitVector> const& rowFilter) {
//Perform backwards DFS from psiStates and find a valid choice for each visited state.
storm::storage::PartialScheduler result;
std::vector<uint_fast64_t> stack;
storm::storage::BitVector currentStates(psiStates); //the states that are either psiStates or for which we have found a valid choice.
stack.insert(stack.end(), currentStates.begin(), currentStates.end());
uint_fast64_t currentState = 0;
while (!stack.empty()) {
currentState = stack.back();
stack.pop_back();
for (typename storm::storage::SparseMatrix<T>::const_iterator predecessorEntryIt = backwardTransitions.begin(currentState), predecessorEntryIte = backwardTransitions.end(currentState); predecessorEntryIt != predecessorEntryIte; ++predecessorEntryIt) {
uint_fast64_t const& predecessor = predecessorEntryIt->getColumn();
if (phiStates.get(predecessor) && !currentStates.get(predecessor)) {
//The predecessor is a probGreater0E state that has not been considered yet. Let's find the right choice that leads to a state in currentStates.
bool foundValidChoice = false;
for (uint_fast64_t row = transitionMatrix.getRowGroupIndices()[predecessor]; row < transitionMatrix.getRowGroupIndices()[predecessor + 1]; ++row) {
if(rowFilter && !rowFilter->get(row)){
continue;
}
for (typename storm::storage::SparseMatrix<T>::const_iterator successorEntryIt = transitionMatrix.begin(row), successorEntryIte = transitionMatrix.end(row); successorEntryIt != successorEntryIte; ++successorEntryIt) {
if(currentStates.get(successorEntryIt->getColumn())){
foundValidChoice = true;
break;
}
}
if(foundValidChoice){
result.setChoice(predecessor, row - transitionMatrix.getRowGroupIndices()[predecessor]);
currentStates.set(predecessor, true);
stack.push_back(predecessor);
break;
}
}
STORM_LOG_INFO_COND(foundValidChoice, "Could not find a valid choice for ProbGreater0E state " << predecessor << ".");
}
}
}
return result;
}
template <typename T>
@ -972,7 +1010,7 @@ namespace storm {
template storm::storage::PartialScheduler computeSchedulerProbGreater0E(storm::storage::BitVector const& probGreater0EStates, storm::storage::SparseMatrix<double> const& transitionMatrix);
template storm::storage::PartialScheduler computeSchedulerProbGreater0E(storm::storage::SparseMatrix<double> const& transitionMatrix, storm::storage::SparseMatrix<double> const& backwardTransitions, storm::storage::BitVector const& phiStates, storm::storage::BitVector const& psiStates, boost::optional<storm::storage::BitVector> const& rowFilter);
template storm::storage::PartialScheduler computeSchedulerProb0E(storm::storage::BitVector const& prob0EStates, storm::storage::SparseMatrix<double> const& transitionMatrix);

19
src/utility/graph.h
View File

@ -234,13 +234,20 @@ namespace storm {
storm::storage::PartialScheduler computeSchedulerWithOneSuccessorInStates(storm::storage::BitVector const& states, storm::storage::SparseMatrix<T> const& transitionMatrix);
/*!
* Computes a scheduler for the given states that have a scheduler that has a probability greater 0.
* Computes a scheduler for the ProbGreater0E-States such that in the induced system the given psiStates are reachable via phiStates
*
* @param probGreater0EStates The states that have a scheduler achieving a probablity greater 0.
* @param transitionMatrix The transition matrix of the system.
* @param backwardTransitions The reversed transition relation.
* @param phiStates The set of states satisfying phi.
* @param psiStates The set of states satisfying psi.
* @param rowFilter If given, the returned scheduler will only pick choices such that rowFilter is true for the corresponding matrixrow.
* @return A Scheduler for the ProbGreater0E-States
*
* @note No choice is defined for ProbGreater0E-States if all the probGreater0-choices violate the row filter.
* This also holds for states that only reach psi via such states.
*/
template <typename T>
storm::storage::PartialScheduler computeSchedulerProbGreater0E(storm::storage::BitVector const& probGreater0EStates, storm::storage::SparseMatrix<T> const& transitionMatrix);
storm::storage::PartialScheduler computeSchedulerProbGreater0E(storm::storage::SparseMatrix<T> const& transitionMatrix, storm::storage::SparseMatrix<T> const& backwardTransitions, storm::storage::BitVector const& phiStates, storm::storage::BitVector const& psiStates, boost::optional<storm::storage::BitVector> const& rowFilter = boost::none);
/*!
* Computes a scheduler for the given states that have a scheduler that has a probability 0.
@ -252,10 +259,14 @@ namespace storm {
storm::storage::PartialScheduler computeSchedulerProb0E(storm::storage::BitVector const& prob0EStates, storm::storage::SparseMatrix<T> const& transitionMatrix);
/*!
* Computes a scheduler for the given states that have a scheduler that has a probability 0.
* Computes a scheduler for the given prob1EStates such that in the induced system the given psiStates are reached with probability 1.
*
* @param prob1EStates The states that have a scheduler achieving probablity 1.
* @param transitionMatrix The transition matrix of the system.
* @param backwardTransitions The reversed transition relation.
* @param phiStates The set of states satisfying phi.
* @param psiStates The set of states satisfying psi.
* @return A scheduler for the Prob1E-States
*/
template <typename T>
storm::storage::PartialScheduler computeSchedulerProb1E(storm::storage::BitVector const& prob1EStates, storm::storage::SparseMatrix<T> const& transitionMatrix, storm::storage::SparseMatrix<T> const& backwardTransitions, storm::storage::BitVector const& phiStates, storm::storage::BitVector const& psiStates);

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