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starting on some builder optimizations

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dehnert 7 years ago
parent
7af70a77aa
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5e43c51f49
4 changed files with 151 additions and 87 deletions
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  1. 188
      src/storm/generator/PrismNextStateGenerator.cpp
  2. 12
      src/storm/generator/PrismNextStateGenerator.h
  3. 8
      src/storm/generator/VariableInformation.cpp
  4. 4
      src/storm/storage/expressions/Variable.cpp

188
src/storm/generator/PrismNextStateGenerator.cpp
View File

@ -136,48 +136,108 @@ namespace storm {
template<typename ValueType, typename StateType>
std::vector<StateType> PrismNextStateGenerator<ValueType, StateType>::getInitialStates(StateToIdCallback const& stateToIdCallback) {
// Prepare an SMT solver to enumerate all initial states.
storm::utility::solver::SmtSolverFactory factory;
std::unique_ptr<storm::solver::SmtSolver> solver = factory.create(program.getManager());
std::vector<storm::expressions::Expression> rangeExpressions = program.getAllRangeExpressions();
for (auto const& expression : rangeExpressions) {
solver->add(expression);
}
solver->add(program.getInitialStatesExpression());
// Proceed ss long as the solver can still enumerate initial states.
std::vector<StateType> initialStateIndices;
while (solver->check() == storm::solver::SmtSolver::CheckResult::Sat) {
// Create fresh state.
// If all states are initial, we can simplify the enumeration substantially.
if (program.hasInitialConstruct() && program.getInitialConstruct().getInitialStatesExpression().isTrue()) {
CompressedState initialState(this->variableInformation.getTotalBitOffset(true));
// Read variable assignment from the solution of the solver. Also, create an expression we can use to
// prevent the variable assignment from being enumerated again.
storm::expressions::Expression blockingExpression;
std::shared_ptr<storm::solver::SmtSolver::ModelReference> model = solver->getModel();
for (auto const& booleanVariable : this->variableInformation.booleanVariables) {
bool variableValue = model->getBooleanValue(booleanVariable.variable);
storm::expressions::Expression localBlockingExpression = variableValue ? !booleanVariable.variable : booleanVariable.variable;
blockingExpression = blockingExpression.isInitialized() ? blockingExpression || localBlockingExpression : localBlockingExpression;
initialState.set(booleanVariable.bitOffset, variableValue);
std::vector<int_fast64_t> currentIntegerValues;
currentIntegerValues.reserve(this->variableInformation.integerVariables.size());
for (auto const& variable : this->variableInformation.integerVariables) {
STORM_LOG_THROW(variable.lowerBound <= variable.upperBound, storm::exceptions::InvalidArgumentException, "Expecting variable with non-empty set of possible values.");
currentIntegerValues.emplace_back(0);
initialState.setFromInt(variable.bitOffset, variable.bitWidth, 0);
}
for (auto const& integerVariable : this->variableInformation.integerVariables) {
int_fast64_t variableValue = model->getIntegerValue(integerVariable.variable);
storm::expressions::Expression localBlockingExpression = integerVariable.variable != model->getManager().integer(variableValue);
blockingExpression = blockingExpression.isInitialized() ? blockingExpression || localBlockingExpression : localBlockingExpression;
initialState.setFromInt(integerVariable.bitOffset, integerVariable.bitWidth, static_cast<uint_fast64_t>(variableValue - integerVariable.lowerBound));
initialStateIndices.emplace_back(stateToIdCallback(initialState));
bool done = false;
while (!done) {
bool changedBooleanVariable = false;
for (auto const& booleanVariable : this->variableInformation.booleanVariables) {
if (initialState.get(booleanVariable.bitOffset)) {
initialState.set(booleanVariable.bitOffset);
changedBooleanVariable = true;
break;
} else {
initialState.set(booleanVariable.bitOffset, false);
}
}
bool changedIntegerVariable = false;
if (changedBooleanVariable) {
initialStateIndices.emplace_back(stateToIdCallback(initialState));
} else {
for (uint64_t integerVariableIndex = 0; integerVariableIndex < this->variableInformation.integerVariables.size(); ++integerVariableIndex) {
auto const& integerVariable = this->variableInformation.integerVariables[integerVariableIndex];
if (currentIntegerValues[integerVariableIndex] < integerVariable.upperBound - integerVariable.lowerBound) {
++currentIntegerValues[integerVariableIndex];
changedIntegerVariable = true;
} else {
currentIntegerValues[integerVariableIndex] = integerVariable.lowerBound;
}
initialState.setFromInt(integerVariable.bitOffset, integerVariable.bitWidth, currentIntegerValues[integerVariableIndex]);
if (changedIntegerVariable) {
break;
}
}
}
if (changedIntegerVariable) {
initialStateIndices.emplace_back(stateToIdCallback(initialState));
}
done = !changedBooleanVariable && !changedIntegerVariable;
}
STORM_LOG_DEBUG("Enumerated " << initialStateIndices.size() << " initial states using brute force enumeration.");
} else {
// Prepare an SMT solver to enumerate all initial states.
storm::utility::solver::SmtSolverFactory factory;
std::unique_ptr<storm::solver::SmtSolver> solver = factory.create(program.getManager());
std::vector<storm::expressions::Expression> rangeExpressions = program.getAllRangeExpressions();
for (auto const& expression : rangeExpressions) {
solver->add(expression);
}
solver->add(program.getInitialStatesExpression());
// Proceed ss long as the solver can still enumerate initial states.
while (solver->check() == storm::solver::SmtSolver::CheckResult::Sat) {
// Create fresh state.
CompressedState initialState(this->variableInformation.getTotalBitOffset(true));
// Read variable assignment from the solution of the solver. Also, create an expression we can use to
// prevent the variable assignment from being enumerated again.
storm::expressions::Expression blockingExpression;
std::shared_ptr<storm::solver::SmtSolver::ModelReference> model = solver->getModel();
for (auto const& booleanVariable : this->variableInformation.booleanVariables) {
bool variableValue = model->getBooleanValue(booleanVariable.variable);
storm::expressions::Expression localBlockingExpression = variableValue ? !booleanVariable.variable : booleanVariable.variable;
blockingExpression = blockingExpression.isInitialized() ? blockingExpression || localBlockingExpression : localBlockingExpression;
initialState.set(booleanVariable.bitOffset, variableValue);
}
for (auto const& integerVariable : this->variableInformation.integerVariables) {
int_fast64_t variableValue = model->getIntegerValue(integerVariable.variable);
storm::expressions::Expression localBlockingExpression = integerVariable.variable != model->getManager().integer(variableValue);
blockingExpression = blockingExpression.isInitialized() ? blockingExpression || localBlockingExpression : localBlockingExpression;
initialState.setFromInt(integerVariable.bitOffset, integerVariable.bitWidth, static_cast<uint_fast64_t>(variableValue - integerVariable.lowerBound));
}
// Register initial state and return it.
StateType id = stateToIdCallback(initialState);
initialStateIndices.push_back(id);
// Register initial state and return it.
StateType id = stateToIdCallback(initialState);
initialStateIndices.push_back(id);
// Block the current initial state to search for the next one.
if (!blockingExpression.isInitialized()) {
break;
// Block the current initial state to search for the next one.
if (!blockingExpression.isInitialized()) {
break;
}
solver->add(blockingExpression);
}
solver->add(blockingExpression);
STORM_LOG_DEBUG("Enumerated " << initialStateIndices.size() << " initial states using SMT solving.");
}
return initialStateIndices;
@ -455,13 +515,29 @@ namespace storm {
return result;
}
template<typename ValueType, typename StateType>
void PrismNextStateGenerator<ValueType, StateType>::generateSynchronizedDistribution(storm::storage::BitVector const& state, ValueType const& probability, uint64_t position, std::vector<std::vector<std::reference_wrapper<storm::prism::Command const>>::const_iterator> const& iteratorList, storm::builder::jit::Distribution<StateType, ValueType>& distribution, StateToIdCallback stateToIdCallback) {
if (storm::utility::isZero<ValueType>(probability)) {
return;
}
if (position >= iteratorList.size()) {
StateType id = stateToIdCallback(state);
distribution.add(id, probability);
} else {
storm::prism::Command const& command = *iteratorList[position];
for (uint_fast64_t j = 0; j < command.getNumberOfUpdates(); ++j) {
storm::prism::Update const& update = command.getUpdate(j);
generateSynchronizedDistribution(applyUpdate(state, update), probability * this->evaluator->asRational(update.getLikelihoodExpression()), position + 1, iteratorList, distribution, stateToIdCallback);
}
}
}
template<typename ValueType, typename StateType>
std::vector<Choice<ValueType>> PrismNextStateGenerator<ValueType, StateType>::getLabeledChoices(CompressedState const& state, StateToIdCallback stateToIdCallback) {
std::vector<Choice<ValueType>> result;
storm::builder::jit::Distribution<CompressedState, ValueType> currentDistribution;
storm::builder::jit::Distribution<CompressedState, ValueType> nextDistribution;
for (uint_fast64_t actionIndex : program.getSynchronizingActionIndices()) {
boost::optional<std::vector<std::vector<std::reference_wrapper<storm::prism::Command const>>>> optionalActiveCommandLists = getActiveCommandsByActionIndex(actionIndex);
@ -475,37 +551,14 @@ namespace storm {
iteratorList[i] = activeCommandList[i].cbegin();
}
storm::builder::jit::Distribution<StateType, ValueType> distribution;
// As long as there is one feasible combination of commands, keep on expanding it.
bool done = false;
while (!done) {
currentDistribution.clear();
nextDistribution.clear();
currentDistribution.add(state, storm::utility::one<ValueType>());
for (uint_fast64_t i = 0; i < iteratorList.size(); ++i) {
storm::prism::Command const& command = *iteratorList[i];
for (uint_fast64_t j = 0; j < command.getNumberOfUpdates(); ++j) {
storm::prism::Update const& update = command.getUpdate(j);
for (auto const& stateProbability : currentDistribution) {
ValueType probability = stateProbability.getValue() * this->evaluator->asRational(update.getLikelihoodExpression());
if (!storm::utility::isZero<ValueType>(probability)) {
// Compute the new state under the current update and add it to the set of new target states.
CompressedState newTargetState = applyUpdate(stateProbability.getState(), update);
nextDistribution.add(newTargetState, probability);
}
}
}
nextDistribution.compress();
// If there is one more command to come, shift the target states one time step back.
if (i < iteratorList.size() - 1) {
currentDistribution = std::move(nextDistribution);
}
}
distribution.clear();
generateSynchronizedDistribution(state, storm::utility::one<ValueType>(), 0, iteratorList, distribution, stateToIdCallback);
distribution.compress();
// At this point, we applied all commands of the current command combination and newTargetStates
// contains all target states and their respective probabilities. That means we are now ready to
@ -529,9 +582,8 @@ namespace storm {
// Add the probabilities/rates to the newly created choice.
ValueType probabilitySum = storm::utility::zero<ValueType>();
for (auto const& stateProbability : nextDistribution) {
StateType actualIndex = stateToIdCallback(stateProbability.getState());
choice.addProbability(actualIndex, stateProbability.getValue());
for (auto const& stateProbability : distribution) {
choice.addProbability(stateProbability.getState(), stateProbability.getValue());
if (this->options.isExplorationChecksSet()) {
probabilitySum += stateProbability.getValue();
}

12
src/storm/generator/PrismNextStateGenerator.h
View File

@ -8,6 +8,13 @@
#include "storm/storage/prism/Program.h"
namespace storm {
namespace builder {
namespace jit {
template <typename StateType, typename ValueType>
class Distribution;
}
}
namespace generator {
template<typename ValueType, typename StateType = uint32_t>
@ -85,6 +92,11 @@ namespace storm {
*/
std::vector<Choice<ValueType>> getLabeledChoices(CompressedState const& state, StateToIdCallback stateToIdCallback);
/*!
* A recursive helper function to generate a synchronziing distribution.
*/
void generateSynchronizedDistribution(storm::storage::BitVector const& state, ValueType const& probability, uint64_t position, std::vector<std::vector<std::reference_wrapper<storm::prism::Command const>>::const_iterator> const& iteratorList, storm::builder::jit::Distribution<StateType, ValueType>& distribution, StateToIdCallback stateToIdCallback);
// The program used for the generation of next states.
storm::prism::Program program;

8
src/storm/generator/VariableInformation.cpp
View File

@ -30,15 +30,13 @@ namespace storm {
}
VariableInformation::VariableInformation(storm::prism::Program const& program, bool outOfBoundsState) : totalBitOffset(0) {
if(outOfBoundsState) {
if (outOfBoundsState) {
outOfBoundsBit = 0;
++totalBitOffset;
} else {
outOfBoundsBit = boost::none;
}
for (auto const& booleanVariable : program.getGlobalBooleanVariables()) {
booleanVariables.emplace_back(booleanVariable.getExpressionVariable(), totalBitOffset, true);
++totalBitOffset;
@ -77,15 +75,13 @@ namespace storm {
STORM_LOG_THROW(!automaton.getVariables().containsNonTransientUnboundedIntegerVariables(), storm::exceptions::InvalidArgumentException, "Cannot build model from JANI model that contains non-transient unbounded integer variables in automaton '" << automaton.getName() << "'.");
STORM_LOG_THROW(!automaton.getVariables().containsNonTransientRealVariables(), storm::exceptions::InvalidArgumentException, "Cannot build model from JANI model that contains non-transient real variables in automaton '" << automaton.getName() << "'.");
}
if(outOfBoundsState) {
if (outOfBoundsState) {
outOfBoundsBit = 0;
++totalBitOffset;
} else {
outOfBoundsBit = boost::none;
}
for (auto const& variable : model.getGlobalVariables().getBooleanVariables()) {
if (!variable.isTransient()) {
booleanVariables.emplace_back(variable.getExpressionVariable(), totalBitOffset, true);

4
src/storm/storage/expressions/Variable.cpp
View File

@ -16,7 +16,11 @@ namespace storm {
}
bool Variable::operator==(Variable const& other) const {
#ifndef NDEBUG
return &this->getManager() == &other.getManager() && index == other.index;
#else
return index == other.index;
#endif
}
bool Variable::operator!=(Variable const& other) const {

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