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first working version (for DTMCs only) 

Former-commit-id: d3c789596e
main
dehnert 10 years ago
parent
034cf626a0
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9f52d9fa97
2 changed files with 29 additions and 40 deletions
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  1. 67
      src/modelchecker/reachability/SparseMdpLearningModelChecker.cpp
  2. 2
      src/modelchecker/reachability/SparseMdpLearningModelChecker.h

67
src/modelchecker/reachability/SparseMdpLearningModelChecker.cpp
View File

@ -61,7 +61,6 @@ namespace storm {
lowerBoundsPerAction[rowGroupIndices[stateToRowGroupMapping[sourceStateId]] + action] = newLowerValue;
STORM_LOG_TRACE("Updating lower value of action " << action << " of state " << sourceStateId << " to " << newLowerValue << ".");
upperBoundsPerAction[rowGroupIndices[stateToRowGroupMapping[sourceStateId]] + action] = newUpperValue;
std::cout << "writing " << newUpperValue << " at index " << (rowGroupIndices[stateToRowGroupMapping[sourceStateId]] + action) << std::endl;
STORM_LOG_TRACE("Updating upper value of action " << action << " of state " << sourceStateId << " to " << newUpperValue << ".");
// Check if we need to update the values for the states.
@ -78,17 +77,10 @@ namespace storm {
template<typename ValueType>
void SparseMdpLearningModelChecker<ValueType>::updateProbabilitiesUsingStack(std::vector<std::pair<StateType, uint32_t>>& stateActionStack, std::vector<std::vector<storm::storage::MatrixEntry<StateType, ValueType>>> const& transitionMatrix, std::vector<StateType> const& rowGroupIndices, std::vector<StateType> const& stateToRowGroupMapping, std::vector<ValueType>& lowerBoundsPerAction, std::vector<ValueType>& upperBoundsPerAction, std::vector<ValueType>& lowerBoundsPerState, std::vector<ValueType>& upperBoundsPerState, StateType const& unexploredMarker) const {
std::cout << "stack:" << std::endl;
for (auto const& entry : stateActionStack) {
std::cout << entry.first << " -[" << entry.second << "]-> ";
}
std::cout << std::endl;
while (stateActionStack.size() > 1) {
stateActionStack.pop_back();
updateProbabilities(stateActionStack.back().first, stateActionStack.back().second, transitionMatrix, rowGroupIndices, stateToRowGroupMapping, lowerBoundsPerAction, upperBoundsPerAction, lowerBoundsPerState, upperBoundsPerState, unexploredMarker);
}
}
@ -102,30 +94,31 @@ namespace storm {
std::vector<uint32_t> allMaxActions;
// Determine the maximal value of any action.
// ValueType max = 0;
// for (uint32_t row = rowGroupIndices[rowGroup]; row < rowGroupIndices[rowGroup + 1]; ++row) {
// ValueType current = 0;
// for (auto const& element : transitionMatrix[row]) {
// current += element.getValue() * upperBoundsPerState[stateToRowGroupMapping[element.getColumn()]];
// }
//
// max = std::max(max, current);
// }
STORM_LOG_TRACE("Looking for action with value " << upperBoundsPerState[stateToRowGroupMapping[currentStateId]] << ".");
ValueType max = 0;
for (uint32_t row = rowGroupIndices[rowGroup]; row < rowGroupIndices[rowGroup + 1]; ++row) {
ValueType current = 0;
for (auto const& element : transitionMatrix[row]) {
current += element.getValue() * (stateToRowGroupMapping[element.getColumn()] == unexploredMarker ? storm::utility::one<ValueType>() : upperBoundsPerState[stateToRowGroupMapping[element.getColumn()]]);
}
max = std::max(max, current);
}
// STORM_LOG_TRACE("Looking for action with value " << upperBoundsPerState[stateToRowGroupMapping[currentStateId]] << ".");
STORM_LOG_TRACE("Looking for action with value " << max << ".");
for (uint32_t row = rowGroupIndices[rowGroup]; row < rowGroupIndices[rowGroup + 1]; ++row) {
ValueType current = 0;
for (auto const& element : transitionMatrix[row]) {
std::cout << "+= " << element.getValue() << " * " << (stateToRowGroupMapping[element.getColumn()] == unexploredMarker ? storm::utility::one<ValueType>() : upperBoundsPerState[stateToRowGroupMapping[element.getColumn()]]) << " (col: " << element.getColumn() << " // row (grp) " << stateToRowGroupMapping[element.getColumn()] << ")" << std::endl;
current += element.getValue() * (stateToRowGroupMapping[element.getColumn()] == unexploredMarker ? storm::utility::one<ValueType>() : upperBoundsPerState[stateToRowGroupMapping[element.getColumn()]]);
}
STORM_LOG_TRACE("Computed (upper) bound " << current << " for row " << row << ".");
// If the action is one of the maximizing ones, insert it into our list.
// TODO: should this need to be an approximate check?
if (current == upperBoundsPerState[stateToRowGroupMapping[currentStateId]]) {
// if (current == upperBoundsPerState[stateToRowGroupMapping[currentStateId]]) {
if (current == max) {
allMaxActions.push_back(row);
std::cout << "found maximizing action " << row << std::endl;
}
}
@ -146,7 +139,9 @@ namespace storm {
// Now sample according to the probabilities.
std::discrete_distribution<StateType> distribution(probabilities.begin(), probabilities.end());
return transitionMatrix[row][distribution(generator)].getColumn();
StateType offset = distribution(generator);
STORM_LOG_TRACE("Sampled " << offset << " from " << probabilities.size() << " elements.");
return transitionMatrix[row][offset].getColumn();
}
template<typename ValueType>
@ -295,12 +290,12 @@ namespace storm {
// its behavior.
if (!foundTargetState) {
// Next, we insert the behavior into our matrix structure.
matrix.resize(matrix.size() + behavior.getNumberOfChoices());
StateType startRow = matrix.size();
matrix.resize(startRow + behavior.getNumberOfChoices());
uint32_t currentAction = 0;
for (auto const& choice : behavior) {
for (auto const& entry : choice) {
std::cout << "got " << currentStateId << " (row group " << stateToRowGroupMapping[currentStateId] << ") " << " -> " << entry.first << " with prob " << entry.second << std::endl;
matrix.back().emplace_back(entry.first, entry.second);
matrix[startRow + currentAction].emplace_back(entry.first, entry.second);
}
lowerBoundsPerAction.push_back(storm::utility::zero<ValueType>());
@ -324,6 +319,9 @@ namespace storm {
// we need to determine this now.
if (matrix[rowGroupIndices[stateToRowGroupMapping[currentStateId]]].empty()) {
foundTargetState = true;
// Update the bounds along the path to the terminal state.
updateProbabilitiesUsingStack(stateActionStack, matrix, rowGroupIndices, stateToRowGroupMapping, lowerBoundsPerAction, upperBoundsPerAction, lowerBoundsPerState, upperBoundsPerState, unexploredMarker);
}
}
@ -342,20 +340,11 @@ namespace storm {
}
}
for (auto const& el : lowerBoundsPerState) {
std::cout << el << " - ";
}
std::cout << std::endl;
for (auto const& el : upperBoundsPerState) {
std::cout << el << " - ";
}
std::cout << std::endl;
STORM_LOG_TRACE("Lower bound is " << lowerBoundsPerState[0] << ".");
STORM_LOG_TRACE("Upper bound is " << upperBoundsPerState[0] << ".");
STORM_LOG_DEBUG("Discovered states: " << stateStorage.numberOfStates << " (" << unexploredStates.size() << " unexplored).");
STORM_LOG_DEBUG("Lower bound is " << lowerBoundsPerState[0] << ".");
STORM_LOG_DEBUG("Upper bound is " << upperBoundsPerState[0] << ".");
ValueType difference = upperBoundsPerState[0] - lowerBoundsPerState[0];
STORM_LOG_TRACE("Difference after iteration " << iteration << " is " << difference << ".");
STORM_LOG_DEBUG("Difference after iteration " << iteration << " is " << difference << ".");
convergenceCriterionMet = difference < 1e-6;
++iteration;

2
src/modelchecker/reachability/SparseMdpLearningModelChecker.h
View File

@ -34,7 +34,7 @@ namespace storm {
uint32_t sampleFromMaxActions(StateType currentStateId, std::vector<std::vector<storm::storage::MatrixEntry<StateType, ValueType>>> const& transitionMatrix, std::vector<StateType> const& rowGroupIndices, std::vector<StateType> const& stateToRowGroupMapping, std::vector<ValueType>& upperBounds, StateType const& unexploredMarker);
StateType sampleSuccessorFromAction(StateType currentStateId, std::vector<std::vector<storm::storage::MatrixEntry<StateType, ValueType>>> const& transitionMatrix, std::vector<StateType> const& rowGroupIndices, std::vector<StateType> const& stateToRowGroupMapping);
// The program that defines the model to check.
storm::prism::Program program;

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