@ -90,6 +90,13 @@ namespace storm {
}
}
// Set data for LRA objectives (if available)
if ( ! lraObjectives . empty ( ) ) {
lraMecDecomposition = LraMecDecomposition ( ) ;
lraMecDecomposition - > mecs = storm : : storage : : MaximalEndComponentDecomposition < ValueType > ( transitionMatrix , transitionMatrix . transpose ( true ) , totalReward0EStates , actionsWithoutRewardInUnboundedPhase ) ;
lraMecDecomposition - > auxMecValues . resize ( lraMecDecomposition - > mecs . size ( ) ) ;
}
// initialize data for the results
checkHasBeenCalled = false ;
objectiveResults . resize ( this - > objectives . size ( ) ) ;
@ -98,21 +105,37 @@ namespace storm {
optimalChoices . resize ( transitionMatrix . getRowGroupCount ( ) , 0 ) ;
}
template < class SparseModelType >
void StandardPcaaWeightVectorChecker < SparseModelType > : : check ( Environment const & env , std : : vector < ValueType > const & weightVector ) {
checkHasBeenCalled = true ;
STORM_LOG_INFO ( " Invoked WeightVectorChecker with weights " < < std : : endl < < " \t " < < storm : : utility : : vector : : toString ( storm : : utility : : vector : : convertNumericVector < double > ( weightVector ) ) ) ;
// Prepare and invoke weighted infinite horizon (long run average) phase
std : : vector < ValueType > weightedRewardVector ( transitionMatrix . getRowCount ( ) , storm : : utility : : zero < ValueType > ( ) ) ;
for ( auto objIndex : objectivesWithNoUpperTimeBound ) {
if ( ! lraObjectives . empty ( ) ) {
boost : : optional < std : : vector < ValueType > > weightedStateRewardVector ;
for ( auto objIndex : lraObjectives ) {
ValueType weight = storm : : solver : : minimize ( this - > objectives [ objIndex ] . formula - > getOptimalityType ( ) ) ? - weightVector [ objIndex ] : weightVector [ objIndex ] ;
storm : : utility : : vector : : addScaledVector ( weightedRewardVector , actionRewards [ objIndex ] , weight ) ;
if ( ! stateRewards [ objIndex ] . empty ( ) ) {
weightedStateRewardVector - > resize ( transitionMatrix . getRowGroupCount ( ) , storm : : utility : : zero < ValueType > ( ) ) ;
storm : : utility : : vector : : addScaledVector ( weightedStateRewardVector . get ( ) , stateRewards [ objIndex ] , weight ) ;
}
}
infiniteHorizonWeightedPhase ( env , weightedRewardVector , weightedStateRewardVector ) ;
// Clear all values of the weighted reward vector
weightedRewardVector . assign ( weightedRewardVector . size ( ) , storm : : utility : : zero < ValueType > ( ) ) ;
}
// Prepare and invoke weighted indefinite horizon (unbounded total reward) phase
auto totalRewardObjectives = objectivesWithNoUpperTimeBound & ~ lraObjectives ;
for ( auto objIndex : totalRewardObjectives ) {
if ( storm : : solver : : minimize ( this - > objectives [ objIndex ] . formula - > getOptimalityType ( ) ) ) {
storm : : utility : : vector : : addScaledVector ( weightedRewardVector , actionRewards [ objIndex ] , - weightVector [ objIndex ] ) ;
} else {
storm : : utility : : vector : : addScaledVector ( weightedRewardVector , actionRewards [ objIndex ] , weightVector [ objIndex ] ) ;
}
}
unboundedWeightedPhase ( env , weightedRewardVector , weightVector ) ;
unboundedIndividualPhase ( env , weightVector ) ;
@ -282,9 +305,32 @@ namespace storm {
return result ;
}
template < class SparseModelType >
void StandardPcaaWeightVectorChecker < SparseModelType > : : infiniteHorizonWeightedPhase ( Environment const & env , std : : vector < ValueType > const & weightedActionRewardVector , boost : : optional < std : : vector < ValueType > > const & weightedStateRewardVector ) {
// Compute the optimal (weighted) lra value for each mec, keeping track of the optimal choices
STORM_LOG_ASSERT ( lraMecDecomposition , " Mec decomposition for lra computations not initialized. " ) ;
storm : : modelchecker : : helper : : SparseNondeterministicInfiniteHorizonHelper < ValueType > helper = createNondetInfiniteHorizonHelper ( ) ;
helper . provideLongRunComponentDecomposition ( lraMecDecomposition - > mecs ) ;
helper . setOptimizationDirection ( storm : : solver : : OptimizationDirection : : Maximize ) ;
helper . setProduceScheduler ( true ) ;
for ( uint64_t mecIndex = 0 ; mecIndex < lraMecDecomposition - > mecs . size ( ) ; + + mecIndex ) {
auto const & mec = lraMecDecomposition - > mecs [ mecIndex ] ;
auto actionValueGetter = [ & weightedActionRewardVector ] ( uint64_t const & a ) { return weightedActionRewardVector [ a ] ; } ;
typename storm : : modelchecker : : helper : : SparseNondeterministicInfiniteHorizonHelper < ValueType > : : ValueGetter stateValueGetter ;
if ( weightedStateRewardVector ) {
stateValueGetter = [ & weightedStateRewardVector ] ( uint64_t const & s ) { return weightedStateRewardVector . get ( ) [ s ] ; } ;
} else {
stateValueGetter = [ ] ( uint64_t const & ) { return storm : : utility : : zero < ValueType > ( ) ; } ;
}
lraMecDecomposition - > auxMecValues [ mecIndex ] = helper . computeLraForComponent ( env , stateValueGetter , actionValueGetter , mec ) ;
}
// Extract the produced optimal choices for the MECs
this - > optimalChoices = std : : move ( helper . getProducedOptimalChoices ( ) ) ;
}
template < class SparseModelType >
void StandardPcaaWeightVectorChecker < SparseModelType > : : unboundedWeightedPhase ( Environment const & env , std : : vector < ValueType > const & weightedRewardVector , std : : vector < ValueType > const & weightVector ) {
if ( this - > objectivesWithNoUpperTimeBound . empty ( ) | | ! storm : : utility : : vector : : hasNonZeroEntry ( weightedRewardVector ) ) {
if ( this - > objectivesWithNoUpperTimeBound . empty ( ) | | ( this - > lraObjectives . empty ( ) & & ! storm : : utility : : vector : : hasNonZeroEntry ( weightedRewardVector ) ) ) {
this - > weightedResult = std : : vector < ValueType > ( transitionMatrix . getRowGroupCount ( ) , storm : : utility : : zero < ValueType > ( ) ) ;
// Get an arbitrary scheduler that yields finite reward for all objectives
this - > optimalChoices = computeSchedulerFinitelyOften ( transitionMatrix , transitionMatrix . transpose ( true ) , ~ actionsWithoutRewardInUnboundedPhase ) ;
@ -293,7 +339,30 @@ namespace storm {
updateEcQuotient ( weightedRewardVector ) ;
// Set up the choice values
storm : : utility : : vector : : selectVectorValues ( ecQuotient - > auxChoiceValues , ecQuotient - > ecqToOriginalChoiceMapping , weightedRewardVector ) ;
if ( ! lraObjectives . empty ( ) ) {
// We also need to assign a value for each ecQuotientChoice that corresponds to "staying" in the eliminated EC. (at this point these choices should all have a value of zero).
// Since each of the eliminated ECs has to contain *at least* one LRA EC, we need to find the largest value among the contained LRA ECs
storm : : storage : : BitVector foundEcqChoices ( ecQuotient - > matrix . getRowCount ( ) , false ) ; // keeps track of choices we have already seen before
for ( uint64_t mecIndex = 0 ; mecIndex < lraMecDecomposition - > mecs . size ( ) ; + + mecIndex ) {
auto const & mec = lraMecDecomposition - > mecs [ mecIndex ] ;
auto const & mecValue = lraMecDecomposition - > auxMecValues [ mecIndex ] ;
uint64_t ecqState = ecQuotient - > originalToEcqStateMapping [ mec . begin ( ) - > first ] ;
uint64_t ecqChoice = ecQuotient - > ecqStayInEcChoices . getNextSetIndex ( ecQuotient - > matrix . getRowGroupIndices ( ) [ ecqState ] ) ;
STORM_LOG_ASSERT ( ecqChoice < ecQuotient - > matrix . getRowGroupIndices ( ) [ ecqState + 1 ] , " Unable to find choice that represents staying inside the (eliminated) ec. " ) ;
auto & ecqChoiceValue = ecQuotient - > auxChoiceValues [ ecqChoice ] ;
if ( foundEcqChoices . get ( ecqChoice ) ) {
ecqChoiceValue = std : : max ( ecqChoiceValue , mecValue ) ;
} else {
STORM_LOG_ASSERT ( storm : : utility : : isZero ( ecqChoiceValue ) , " Expected a total reward of zero for choices that represent staying in an EC for ever. " ) ;
ecqChoiceValue = mecValue ;
foundEcqChoices . set ( ecqChoice , true ) ;
}
}
}
// TODO: Continue to integrate LRA here (solver bounds need to be set correctly)
storm : : solver : : GeneralMinMaxLinearEquationSolverFactory < ValueType > solverFactory ;
std : : unique_ptr < storm : : solver : : MinMaxLinearEquationSolver < ValueType > > solver = solverFactory . create ( env , ecQuotient - > matrix ) ;
@ -420,20 +489,32 @@ namespace storm {
template < class SparseModelType >
void StandardPcaaWeightVectorChecker < SparseModelType > : : updateEcQuotient ( std : : vector < ValueType > const & weightedRewardVector ) {
// Check whether we need to update the currently cached ecElimResult
storm : : storage : : BitVector newReward0Choices = storm : : utility : : vector : : filterZero ( weightedRewardVector ) ;
storm : : storage : : BitVector newTotalReward0Choices = storm : : utility : : vector : : filterZero ( weightedRewardVector ) ;
storm : : storage : : BitVector zeroLraRewardChoices ( weightedRewardVector . size ( ) , true ) ;
if ( lraMecDecomposition ) {
for ( uint64_t mecIndex = 0 ; mecIndex < lraMecDecomposition - > mecs . size ( ) ; + + mecIndex ) {
if ( ! storm : : utility : : isZero ( lraMecDecomposition - > auxMecValues [ mecIndex ] ) ) {
// The mec has a non-zero value, so flag all its choices as non-zero
auto const & mec = lraMecDecomposition - > mecs [ mecIndex ] ;
for ( auto const & stateChoices : mec ) {
for ( auto const & choice : stateChoices . second ) {
zeroLraRewardChoices . set ( choice , false ) ;
}
}
}
}
}
storm : : storage : : BitVector newReward0Choices = newTotalReward0Choices & zeroLraRewardChoices ;
if ( ! ecQuotient | | ecQuotient - > origReward0Choices ! = newReward0Choices ) {
// It is sufficient to consider the states from which a transition with non-zero reward is reachable. (The remaining states always have reward zero).
storm : : storage : : BitVector nonZeroRewardStates ( transitionMatrix . getRowGroupCount ( ) , false ) ;
for ( uint_fast64_t state = 0 ; state < transitionMatrix . getRowGroupCount ( ) ; + + state ) {
if ( newReward0Choices . getNextUnsetIndex ( transitionMatrix . getRowGroupIndices ( ) [ state ] ) < transitionMatrix . getRowGroupIndices ( ) [ state + 1 ] ) {
nonZeroRewardStates . set ( state ) ;
}
}
auto nonZeroRewardStates = transitionMatrix . getRowGroupFilter ( newReward0Choices , true ) ;
nonZeroRewardStates . complement ( ) ;
storm : : storage : : BitVector subsystemStates = storm : : utility : : graph : : performProbGreater0E ( transitionMatrix . transpose ( true ) , storm : : storage : : BitVector ( transitionMatrix . getRowGroupCount ( ) , true ) , nonZeroRewardStates ) ;
// Remove neutral end components, i.e., ECs in which no reward is earned.
auto ecElimResult = storm : : transformer : : EndComponentEliminator < ValueType > : : transform ( transitionMatrix , subsystemStates , ecChoicesHint & newReward0Choices , reward0EStates ) ;
// Remove neutral end components, i.e., ECs in which no total reward is earned.
// Note that such ECs contain one (or maybe more) LRA ECs.
auto ecElimResult = storm : : transformer : : EndComponentEliminator < ValueType > : : transform ( transitionMatrix , subsystemStates , ecChoicesHint & newTotalReward0Choices , totalReward0EStates ) ;
storm : : storage : : BitVector rowsWithSumLessOne ( ecElimResult . matrix . getRowCount ( ) , false ) ;
for ( uint64_t row = 0 ; row < rowsWithSumLessOne . size ( ) ; + + row ) {
@ -453,11 +534,10 @@ namespace storm {
ecQuotient - > matrix = std : : move ( ecElimResult . matrix ) ;
ecQuotient - > ecqToOriginalChoiceMapping = std : : move ( ecElimResult . newToOldRowMapping ) ;
ecQuotient - > originalToEcqStateMapping = std : : move ( ecElimResult . oldToNewStateMapping ) ;
ecQuotient - > ecqStayInEcChoices = std : : move ( ecElimResult . sinkRows ) ;
ecQuotient - > origReward0Choices = std : : move ( newReward0Choices ) ;
ecQuotient - > rowsWithSumLessOne = std : : move ( rowsWithSumLessOne ) ;
ecQuotient - > auxStateValues . reserve ( transitionMatrix . getRowGroupCount ( ) ) ;
ecQuotient - > auxStateValues . resize ( ecQuotient - > matrix . getRowGroupCount ( ) ) ;
ecQuotient - > auxChoiceValues . reserve ( transitionMatrix . getRowCount ( ) ) ;
ecQuotient - > auxChoiceValues . resize ( ecQuotient - > matrix . getRowCount ( ) ) ;
}
}
Tim Quatmann
5 years ago