Exemplo n.º 1
0
        public MDP ComputeGCPP(VerificationOutput VerificationOutput)
        {
            MDP toReturn = new MDP(Precision, MAX_DIFFERENCE);

            //add Initial
            MDPState Initial = new MDPState(InitState.ID);
            toReturn.AddState(Initial);
            toReturn.SetInit(Initial);

            //add target
            foreach (MDPState targetstate in this.TargetStates)
            {
                AddTargetStates(targetstate);
            }

            //note here remaining doesn't include the target states and initial states
            HashSet<MDPState> remaining = new HashSet<MDPState>();
            foreach (MDPState mdpState in States.Values)
            {
                if (!TargetStates.Contains(mdpState) && InitState != mdpState)
                {
                    remaining.Add(mdpState);
                }
            }

            //instantiate GCPP
            GCPP gcpp = new GCPP();
            Dictionary<string, int> table = new Dictionary<string, int>();

            foreach (MDPState mdpState in remaining)
            {
                gcpp.MDPTable.Add(mdpState.ID, mdpState);
                table.Add(mdpState.ID, 0);
            }

            int n = 0;
            foreach (MDPState mdpState1 in remaining)
            {
                foreach (MDPState mdpState2 in remaining)
                {
                    List<MDPState> list = new List<MDPState>();
                    if (mdpState1 != mdpState2 && table[mdpState1.ID] == table[mdpState2.ID] && PropositionEquals(mdpState1, mdpState2))
                    {
                        list.Add(mdpState1);
                        list.Add(mdpState2);
                        table[mdpState1.ID] = 1;
                        table[mdpState2.ID] = 1;
                        gcpp.PartOrder.Add(n, n);
                        gcpp.Partition.Add(n, list);
                        gcpp.PartitionGetKey.Add(list, n++);
                    }
                }
            }

            gcpp.partition = null;
            gcpp.partorder = null;

            while (gcpp.Partition != gcpp.partition || gcpp.PartOrder != gcpp.partorder)
            {
                gcpp.partition = gcpp.Partition;
                gcpp.partorder = gcpp.PartOrder;

                foreach (List<MDPState> B in gcpp.partition.Values)
                {
                    //GCPP item = new GCPP();
                    gcpp = Split(gcpp, B);
                    //∑:=∑\{B}∪{∑B}
                    gcpp.Partition.Remove(gcpp.PartitionGetKey[B]);
                    foreach (KeyValuePair<int, List<MDPState>> pair in gcpp.partition)
                    {
                        gcpp.Partition.Add(n, pair.Value);
                        gcpp.PartitionGetKey.Add(pair.Value, n);
                    }
                    //≤:=≤∪≤B
                    //   ∪{(B',X)|X∈∑:B'∈∑B:(B,X)∈≤}
                    //   ∪{(X,B')|X∈∑:B'∈∑B:(X,B)∈≤}
                    //    \{(B,X),(X,B)|X∈∑:(X,B),(B,X)∈≤}
                    foreach (KeyValuePair<int, int> pair in gcpp.partorder)
                    {
                        gcpp.PartOrder.Add(pair.Key, pair.Value);
                    }
                    foreach (List<MDPState> X in gcpp.Partition.Values)
                    {
                        if (SamePartOrder(X, B, gcpp.PartOrder, gcpp.PartitionGetKey) && SamePartOrder(B, X, gcpp.PartOrder, gcpp.PartitionGetKey))
                        {
                            var query1 = from p in gcpp.PartOrder
                                         where p.Key == gcpp.PartitionGetKey[B] && p.Value == gcpp.PartitionGetKey[X]
                                         select p.Key;
                            gcpp.PartOrder.Remove(query1.FirstOrDefault());

                            var query2 = from p in gcpp.PartOrder
                                         where p.Key == gcpp.PartitionGetKey[X] && p.Value == gcpp.PartitionGetKey[B]
                                         select p.Key;
                            gcpp.PartOrder.Remove(query2.FirstOrDefault());
                        }
                        foreach (List<MDPState> B1 in gcpp.partition.Values)
                        {
                            if (SamePartOrder(B, X, gcpp.PartOrder, gcpp.PartitionGetKey))
                            {
                                gcpp.PartOrder.Add(gcpp.PartitionGetKey[B1], gcpp.PartitionGetKey[X]);
                            }
                            if (SamePartOrder(X, B, gcpp.PartOrder, gcpp.PartitionGetKey))
                            {
                                gcpp.PartOrder.Add(gcpp.PartitionGetKey[X], gcpp.PartitionGetKey[B1]);
                            }
                        }
                    }

                }
            }

            return toReturn;
        }
Exemplo n.º 2
0
        //re-calculate the distribution after removing selfloop
        //public Distribution DistrbutionReCalculate(List<string> newSCC, MDPState node, Distribution distr)
        //{
        //    double nonSelfLoopProb = 0.0;
        //    for (int i = 0; i < distr.States.Count; i++)
        //    {
        //        KeyValuePair<double, MDPState> pair = distr.States[i];
        //        if (newSCC.Contains(pair.Value.ID))
        //        {
        //            //selfLoopProb += pair.Key;
        //            //hasSelfLoop = true;
        //            //the self loop is removed in this distribution
        //            distr.States.Remove(pair);
        //            //i-- is used to keep the loop correct after removing one element
        //            i--;
        //        }
        //        else
        //        {
        //            nonSelfLoopProb += pair.Key;
        //        }
        //    }
        //    foreach (KeyValuePair<double, MDPState> pair in distr.States)
        //    {
        //        //KeyValuePair<double, MDPState> newPair = new KeyValuePair<double, MDPState>(pair.Key / nonSelfLoopProb, pair.Value);
        //        distr.AddProbStatePair(pair.Key / nonSelfLoopProb, pair.Value);
        //        distr.States.Remove(pair);
        //    }
        //    return distr;
        //}
        //this method is used to remove all loops in a DTMC.
        public MDP BuildQuotientMDPBisimulation(VerificationOutput VerificationOutput)
        {
            MDP toReturn = new MDP(Precision, MAX_DIFFERENCE);

            //calculate the nonsafe states, whose maximal prob is not 0
            Stack<MDPState> NonSafe = new Stack<MDPState>(TargetStates);
            Stack<MDPState> helper = new Stack<MDPState>(TargetStates);

            //backward checking from target states
            while (helper.Count != 0)
            {
                MDPState t = helper.Pop();
                foreach (MDPState s in t.Pre)
                {
                    bool addState = false;

                    //check each distribution; as long as s has a post state in NonSafe, then s should be added.
                    foreach (Distribution distribution in s.Distributions)
                    {
                        foreach (KeyValuePair<double, MDPState> pair in distribution.States)
                        {
                            if (NonSafe.Contains(pair.Value))
                            {
                                addState = true;
                                //s.Distributions.Remove(distribution);
                                break;
                            }
                        }

                        if (addState)
                        {
                            break;
                        }
                    }

                    if (addState && !NonSafe.Contains(s))
                    {
                        helper.Push(s);
                        NonSafe.Push(s);
                    }

                }
            }

            //note here remaining doesn't include the target states and initial states
            HashSet<MDPState> remaining = new HashSet<MDPState>();
            foreach (MDPState mdpState in NonSafe)
            {
                if (!TargetStates.Contains(mdpState) && InitState != mdpState)
                {
                    remaining.Add(mdpState);
                }
            }

            //add Initial
            MDPState Initial = new MDPState(InitState.ID);
            toReturn.AddState(Initial);
            toReturn.SetInit(Initial);

            //add target
            MDPState Target = new MDPState("target");
            toReturn.AddState(Target);
            toReturn.AddTargetStates(Target);

            //add safe
            MDPState Safe = new MDPState("safe");
            toReturn.AddState(Safe);

            //add remaining
            //MDPState Remaining = new MDPState("remaining");
            //toReturn.AddState(Remaining);

            //add selfloop at Target.
            //Target.AddDistribution(new Distribution(Constants.TAU, Target));

            //add selfloop at Safe.
            //Safe.AddDistribution(new Distribution(Constants.TAU, Safe));

            //add the group distributions in Remaining

            List<HashSet<MDPState>> SeperatingRemaining = new List<HashSet<MDPState>>();

            SeperatingRemaining.Add(remaining);

            bool refinement = true;

            while (refinement)//if the former iteration has splitted some groups
            {
                refinement = false;

                for (int i = 0; i < SeperatingRemaining.Count; i++)
                {
                    HashSet<MDPState> mdpStates = SeperatingRemaining[i];

                    if (mdpStates.Count > 1)
                    {
                        Dictionary<string, HashSet<MDPState>> groups = SeperateGroup(SeperatingRemaining, mdpStates, Initial, Target, Safe);

                        if (groups.Count > 1)
                        {
                            SeperatingRemaining.RemoveAt(i--);

                            foreach (KeyValuePair<string, HashSet<MDPState>> keyValuePair in groups)
                            {
                                SeperatingRemaining.Add(keyValuePair.Value);
                            }

                            refinement = true;
                        }
                    }
                }
                //List<HashSet<MDPState>> NewSeperating = new List<HashSet<MDPState>>();

                //foreach (HashSet<MDPState> mdpStates in SeperatingRemaining)
                //{

                //    if (mdpStates.Count > 1)
                //        {
                //            int counter = 0;

                //            foreach (HashSet<MDPState> grouped in SeperateGroup(SeperatingRemaining, mdpStates, Initial, Target, Safe).Values)
                //            {
                //                counter++;
                //                NewSeperating.Add(grouped);
                //            }

                //            if (counter > 1)
                //            {
                //                refinement = true;
                //            }

                //        }
                //        else
                //        {
                //            NewSeperating.Add(mdpStates);
                //        }
                //    }

                ////todo: reduce the loop number
                //SeperatingRemaining = NewSeperating;

            }

            //add distributions after all the refinement
            foreach (HashSet<MDPState> mdpStates in SeperatingRemaining)
            {
                //add representative state of each groupd states
                MDPState Grouped = StateFromHashset(mdpStates);
                toReturn.AddState(new MDPState(Grouped.ID));

            }

            foreach (MDPState state in toReturn.States.Values)
            {
                if (state.ID == "target" || state.ID == "safe")
                {
                    continue;
                }

                HashSet<Distribution> DistrToAdd = new HashSet<Distribution>();

                foreach (Distribution Distr in this.States[state.ID].Distributions)
                {
                    Distribution newDistr = calcGroupedDistr(SeperatingRemaining, Distr, Initial, Target, Safe, toReturn);
                    DistrToAdd.Add(newDistr);
                }

                foreach (Distribution distribution in DistrToAdd)
                {
                    toReturn.AddDistribution(state.ID, distribution);
                }
            }
            //foreach (HashSet<MDPState> mdpStates in SeperatingRemaining)
            //{
            //    MDPState Grouped = StateFromHashset(mdpStates);
            //    FinalgroupedDistribution(SeperatingRemaining, Grouped, Target, Safe, toReturn);//calculate the grouped distributions
            //}

            //note: add initial state's distributions after refinement
            //FinalgroupedDistribution(SeperatingRemaining, InitState, Target, Safe, toReturn);
            return toReturn;
        }
Exemplo n.º 3
0
        public Distribution calcGroupedDistr(List<HashSet<MDPState>> ListHashMDP, Distribution Distr, MDPState Initial, MDPState Target, MDPState Safe, MDP mdp)
        {
            Distribution toReturn = new Distribution(Distr.Event);

            double toInit = 0;
            double toTarget = 0;
            double[] combined = new double[ListHashMDP.Count];
            //MDPState[] groupstates = new MDPState[seperation.Count];

            foreach (KeyValuePair<double, MDPState> transition in Distr.States)
            {
                if (TargetStates.Contains(transition.Value))
                {
                    toTarget += transition.Key;
                }
                else if (InitState == transition.Value)
                {
                    toInit += transition.Key;
                }
                else
                {
                    for (int i = 0; i < ListHashMDP.Count; i++)
                    {
                        if (ListHashMDP[i].Contains(transition.Value))
                        {
                            combined[i] += transition.Key;
                            break;
                        }
                    }
                }

            }

            double toSafe = 1 - toTarget - toInit;

            for (int i = 0; i < ListHashMDP.Count; i++)
            {
                toSafe -= combined[i];
            }

            if (toInit != 0)
            {
                toReturn.AddProbStatePair(Math.Round(toInit, 5), Initial);
            }

            if (toTarget != 0)
            {
                toReturn.AddProbStatePair(Math.Round(toTarget, 5), Target);
            }

            if (toSafe != 0)
            {
                toReturn.AddProbStatePair(Math.Round(toSafe, 5), Safe);
            }

            //toReturn.AddProbStatePair(toSafe, Safe);
            for (int j = 0; j < ListHashMDP.Count; j++)
            {
                if (combined[j] != 0)
                {
                    MDPState state = mdp.States[StateFromHashset(ListHashMDP[j]).ID];
                    toReturn.AddProbStatePair(Math.Round(combined[j], 5), state);
                    //toReturn.AddProbStatePair(Math.Round(combined[j], 5), StateFromHashset(ListHashMDP[j]));
                }

            }

            return toReturn;
        }
Exemplo n.º 4
0
        public MDP BuildQuotientMDP(VerificationOutput VerificationOutput)
        {
            //return this;

            MDP toReturn = new MDP(Precision, MAX_DIFFERENCE);

            //todo change to set
            List<KeyValuePair<string, string>> BoundaryOneTransition = new List<KeyValuePair<string, string>>();

            //todo change to set
            List<Distribution> ProbTransitions = new List<Distribution>();

            Dictionary<string, List<Distribution>> GlobalProbTransitions = new Dictionary<string, List<Distribution>>();

            StringDictionary<bool> visited = new StringDictionary<bool>(States.Count);
            List<KeyValuePair<HashSet<string>, MDPState>> sccs = new List<KeyValuePair<HashSet<string>, MDPState>>();

            Dictionary<string, int> preorder = new Dictionary<string, int>();
            Dictionary<string, int> lowlink = new Dictionary<string, int>();
            //HashSet<string> scc_found = new HashSet<string>();
            Stack<MDPState> TaskStack = new Stack<MDPState>();

            //Dictionary<string, List<string>> OutgoingTransitionTable = new Dictionary<string, List<string>>();
            Stack<MDPState> stepStack = new Stack<MDPState>(1024);

            visited.Add(InitState.ID, false);
            TaskStack.Push(InitState);

            //# Preorder counter
            int preor = 0;

            do
            {
                while (TaskStack.Count > 0)
                {
                    MDPState pair = TaskStack.Peek();
                    string v = pair.ID;

                    if (visited.GetContainsKey(v) && visited.GetContainsKey(v))
                    {
                        TaskStack.Pop();
                        continue;
                    }

                    if (!preorder.ContainsKey(v))
                    {
                        preorder.Add(v, preor);
                        preor++;
                    }

                    bool done = true;

                    List<Distribution> list = pair.Distributions;
                    List<MDPState> nonProbTrans = new List<MDPState>();
                    List<Distribution> ProbTrans = new List<Distribution>();

                    for (int i = 0; i < list.Count; i++)
                    {
                        if (list[i].IsTrivial())
                        {
                            nonProbTrans.Add(list[i].States[0].Value);
                        }
                        else
                        {
                            ProbTrans.Add(list[i]);
                        }
                    }

                    if (ProbTrans.Count > 0 && !GlobalProbTransitions.ContainsKey(v))
                    {
                        GlobalProbTransitions.Add(v, ProbTrans);
                        ProbTransitions.AddRange(ProbTrans);
                    }

                    for (int k = nonProbTrans.Count - 1; k >= 0; k--)
                    {
                        MDPState step = nonProbTrans[k];
                        string tmp = step.ID;

                        if (visited.ContainsKey(tmp))
                        {
                            //if this node is still not visited
                            if (!preorder.ContainsKey(tmp))
                            {
                                //only put the first one to the work list stack.
                                //if there are more than one node to be visited,
                                //simply ignore them and keep its event step in the list.
                                if (done)
                                {
                                    TaskStack.Push(step);
                                    done = false;
                                }
                            }
                        }
                        else
                        {
                            visited.Add(tmp, false);
                            //OutgoingTransitionTable.Add(tmp, new List<string>(8));

                            //only put the first one into the stack.
                            if (done)
                            {
                                TaskStack.Push(step);
                                done = false;
                            }
                        }
                    }

                    if (done)
                    {
                        int lowlinkV = preorder[v];
                        int preorderV = preorder[v];

                        bool selfLoop = false;
                        for (int j = 0; j < nonProbTrans.Count; j++)
                        {
                            string w = nonProbTrans[j].ID;

                            if (w == v)
                            {
                                selfLoop = true;
                            }

                            if (!visited.GetContainsKey(w))
                            {
                                if (preorder[w] > preorderV)
                                {
                                    lowlinkV = Math.Min(lowlinkV, lowlink[w]);
                                }
                                else
                                {
                                    lowlinkV = Math.Min(lowlinkV, preorder[w]);
                                }
                            }
                            else //in this case, there is a tau transition leading to an SCC; must add the transition into the toReturn automaton
                            {
                                BoundaryOneTransition.Add(new KeyValuePair<string, string>(v, w));
                            }
                        }

                        lowlink[v] = lowlinkV;

                        TaskStack.Pop();

                        HashSet<string> scc = new HashSet<string>();

                        if (lowlinkV == preorderV)
                        {
                            scc.Add(v);
                            visited.SetValue(v, true);

                            while (stepStack.Count > 0 && preorder[stepStack.Peek().ID] > preorderV)
                            {
                                string s = stepStack.Pop().ID;

                                scc.Add(s);
                                visited.SetValue(s, true);
                            }

                            MDPState newstate = new MDPState(toReturn.States.Count.ToString());
                            if (scc.Count > 1 || (scc.Count == 1 && selfLoop))
                            {
                                newstate.AddDistribution(new Distribution(Constants.TAU, newstate)); //add self loop: sun jun
                            }
                            sccs.Add(new KeyValuePair<HashSet<string>, MDPState>(scc, newstate));

                            toReturn.AddState(newstate);

                            if (scc.Contains(InitState.ID))
                            {
                                toReturn.SetInit(newstate);
                            }

                            foreach (MDPState state in TargetStates)
                            {
                                if (scc.Contains(state.ID))
                                {
                                    toReturn.AddTargetStates(newstate);
                                }
                            }
                        }
                        else
                        {
                            stepStack.Push(pair);
                        }
                    }
                }

                if (ProbTransitions.Count > 0)
                {
                    foreach (Distribution step in ProbTransitions)
                    {
                        foreach (KeyValuePair<double, MDPState> pair in step.States)
                        {
                            string stateID = pair.Value.ID;
                            if (!visited.ContainsKey(stateID))
                            {
                                TaskStack.Push(pair.Value);
                                visited.Add(stateID, false);
                            }
                        }
                    }
                    ProbTransitions.Clear();
                }
            } while (TaskStack.Count > 0);

            foreach (KeyValuePair<string, string> pair in BoundaryOneTransition)
            {
                MDPState source = null;
                MDPState target = null;

                foreach (KeyValuePair<HashSet<string>, MDPState> sccstate in sccs)
                {
                    if (sccstate.Key.Contains(pair.Key))
                    {
                        source = sccstate.Value;
                    }

                    if (sccstate.Key.Contains(pair.Value))
                    {
                        target = sccstate.Value;
                    }
                }

                toReturn.AddDistribution(source.ID, new Distribution(Constants.TAU, target));
                VerificationOutput.ReducedMDPTransitions++;

            }

            foreach (KeyValuePair<string, List<Distribution>> pair in GlobalProbTransitions)
            {
                MDPState source = null;

                foreach (KeyValuePair<HashSet<string>, MDPState> sccstate in sccs)
                {
                    if (sccstate.Key.Contains(pair.Key))
                    {
                        source = sccstate.Value;
                        break;
                    }
                }

                foreach (Distribution distribution in pair.Value)
                {
                    Distribution disNew = new Distribution(distribution.Event);
                    foreach (KeyValuePair<double, MDPState> state in distribution.States)
                    {
                        foreach (KeyValuePair<HashSet<string>, MDPState> sccstate in sccs)
                        {
                            if (sccstate.Key.Contains(state.Value.ID))
                            {
                                disNew.AddProbStatePair(state.Key, sccstate.Value);
                                VerificationOutput.ReducedMDPTransitions++;
                                break;
                            }
                        }
                    }

                    toReturn.AddDistribution(source.ID, disNew);
                }
            }
            VerificationOutput.ReducedMDPStates = toReturn.States.Count;
            return toReturn;
        }
Exemplo n.º 5
0
        protected MDP BuildMDP_SCC_Cut_Mutlicores()
        {
            Stack<KeyValuePair<MDPConfiguration, MDPState>> working = new Stack<KeyValuePair<MDPConfiguration, MDPState>>(1024);

            string initID = InitialStep.GetID();
            MDPState init = new MDPState(initID);
            working.Push(new KeyValuePair<MDPConfiguration, MDPState>(InitialStep as MDPConfiguration, init));
            MDP mdp = new MDP(init, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);

            Stack<MDPState> stepStack = new Stack<MDPState>(1024);
            //MDPState2DRAStateMapping = new Dictionary<string, int>(Common.Classes.Ultility.Ultility.MC_INITIAL_SIZE);
            const int VISITED_NOPREORDER = -1;
            const int SCC_FOUND = -2;
            const int SCCBound = 20;
            //DFS data, which mapping each state to an int[] of size 3, first is the pre-order, second is the lowlink, last one is DRAState
            Dictionary<string, int[]> DFSData = new Dictionary<string, int[]>(Ultility.Ultility.MC_INITIAL_SIZE);

            DFSData.Add(initID, new int[] { VISITED_NOPREORDER, 0 });
            //build the MDP while identifying the SCCs
            List<List<MDPState>> SCCs = new List<List<MDPState>>(64);
            Dictionary<int, List<MDPState>> scc2out = new Dictionary<int, List<MDPState>>();
            Dictionary<int, HashSet<MDPState>> scc2input = new Dictionary<int, HashSet<MDPState>>();
            //Dictionary<string, int> preorder = new Dictionary<string, int>(Common.Classes.Ultility.Ultility.MC_INITIAL_SIZE);
            //Dictionary<string, int> lowlink = new Dictionary<string, int>(Common.Classes.Ultility.Ultility.MC_INITIAL_SIZE);

            int preordercounter = 0;
            Dictionary<string, List<MDPConfiguration>> ExpendedNode = new Dictionary<string, List<MDPConfiguration>>();

            bool reachTarget = true;

            do
            {
                if (CancelRequested)
                {
                    this.VerificationOutput.NoOfStates = this.VerificationOutput.NoOfStates + mdp.States.Count;
                    return mdp;
                }

                KeyValuePair<MDPConfiguration, MDPState> pair = working.Peek();
                MDPConfiguration evt = pair.Key;
                //int DRAState = pair.Key.state;
                string currentID = pair.Key.GetID();
                MDPState currentState = pair.Value;
                List<Distribution> outgoing = currentState.Distributions;

                //if (!preorder.ContainsKey(currentID))
                //{
                //    preorder.Add(currentID, preorderCounter);
                //    preorderCounter++;
                //}

                int[] nodeData = DFSData[currentID];

                if (nodeData[0] == VISITED_NOPREORDER)
                {
                    nodeData[0] = preordercounter;
                    preordercounter++;
                }

                bool done = true;

                if (ExpendedNode.ContainsKey(currentID))
                {
                    if (reachTarget)
                    {
                        currentState.ReachTarget = reachTarget;
                    }
                    else
                    {
                        reachTarget = currentState.ReachTarget;
                    }
                    List<MDPConfiguration> list = ExpendedNode[currentID];
                    if (list.Count > 0)
                    {
                        for (int k = list.Count - 1; k >= 0; k--)
                        {
                            MDPConfiguration step = list[k];

                            string stepID = step.GetID();
                            //if (!preorder.ContainsKey(stepID))
                            if (DFSData[stepID][0] == VISITED_NOPREORDER)
                            {
                                if (done)
                                {
                                    working.Push(new KeyValuePair<MDPConfiguration, MDPState>(step, mdp.States[stepID]));
                                    done = false;
                                    list.RemoveAt(k);
                                }
                            }
                            else
                            {
                                MDPState s = mdp.States[stepID];
                                if (s.ReachTarget)
                                {
                                    reachTarget = true;
                                    currentState.ReachTarget = reachTarget;

                                    if (s.SCCIndex >= 0)
                                    {
                                        scc2input[s.SCCIndex].Add(s);
                                    }

                                }
                                list.RemoveAt(k);
                            }
                        }
                    }
                }
                else
                {
                    reachTarget = false;
                    int currentDistriIndex = -1;
                    Distribution newDis = new Distribution(Constants.TAU);

                    //MDPConfiguration[] steps = evt.MakeOneMoveLocal();
                    IEnumerable<MDPConfiguration> steps = evt.MakeOneMoveLocal();
                    //NOTE: here we play a trick for deadlock case: if a deadlock exist in the MDP, we will make a
                    //self loop transition to remove the deadlock. Deadlock is meaningless in MDP.
                    if (evt.IsDeadLock)
                    {
                        //List<MDPConfiguration> stepsList = new List<MDPConfiguration>(steps);
                        working.Pop();
                        nodeData[0] = SCC_FOUND;
                        continue;
                        //stepsList.Add(CreateSelfLoopStep(evt));
                        //steps = stepsList.ToArray();
                        //HasDeadLock = true;
                    }
                    List<MDPConfiguration> stepsList = new List<MDPConfiguration>(steps);
                    //List<PCSPEventDRAPair> product = Next(steps, DRAState);
                    this.VerificationOutput.Transitions += stepsList.Count;

                    for (int k = stepsList.Count - 1; k >= 0; k--)
                    {
                        MDPConfiguration step = stepsList[k];
                        string tmp = step.GetID();
                        bool target = false;
                        ExpressionValue v = EvaluatorDenotational.Evaluate(ReachableStateCondition, step.GlobalEnv);

                        MDPState nextState;

                        if ((v as BoolConstant).Value)
                        {
                            target = true;
                            if (!DFSData.Keys.Contains(tmp))
                            {
                                DFSData.Add(tmp, new int[] { SCC_FOUND, SCC_FOUND });
                                //    nextState = new MDPState(tmp);
                                //    mdp.States.Add(tmp, nextState);
                                //preordercounter++;
                            }
                            //else if(DFSData[tmp][0] == VISITED_NOPREORDER)
                            //{
                            //    DFSData[tmp][0] = preordercounter;
                            //    preordercounter++;
                            //}
                        }
                        //int nextIndex = VisitedWithID.Count;

                        int[] data;
                        if (mdp.States.TryGetValue(tmp, out nextState))
                        {
                            DFSData.TryGetValue(tmp, out data);
                            if (!target && data[0] == VISITED_NOPREORDER)
                            {
                                //if (mdp.States.TryGetValue(tmp, out nextState))
                                //{

                                //    if (!preorder.ContainsKey(tmp))
                                //    {
                                if (done)
                                {
                                    working.Push(new KeyValuePair<MDPConfiguration, MDPState>(step, nextState));
                                    done = false;
                                    stepsList.RemoveAt(k);
                                }
                                else
                                {
                                    stepsList[k] = step;
                                }
                            }
                            else
                            {
                                stepsList.RemoveAt(k);
                                MDPState s = mdp.States[tmp];
                                if (s.ReachTarget)
                                {
                                    reachTarget = true;
                                    currentState.ReachTarget = reachTarget;
                                    if (s.SCCIndex >= 0)
                                    {
                                        scc2input[s.SCCIndex].Add(s);
                                    }
                                }
                            }
                        }
                        else
                        {
                            if (!target)
                            {
                                DFSData.Add(tmp, new int[] { VISITED_NOPREORDER, 0 });
                            }

                            nextState = new MDPState(tmp);
                            mdp.States.Add(tmp, nextState);
                            if (done)
                            {
                                if (target)
                                {
                                    mdp.AddTargetStates(nextState);
                                    reachTarget = true;
                                }
                                else
                                {
                                    working.Push(new KeyValuePair<MDPConfiguration, MDPState>(step, nextState));
                                }

                                done = false;
                                stepsList.RemoveAt(k);
                            }
                            else
                            {
                                if (target)
                                {
                                    stepsList.RemoveAt(k);
                                    mdp.AddTargetStates(nextState);
                                    reachTarget = true;
                                }
                                else
                                {
                                    stepsList[k] = step;
                                }
                            }
                        }

                        MDPConfiguration pstep = step;

                        if (pstep.DisIndex == -1)
                        {
                            if (currentDistriIndex >= 0)
                            {
                                //currentState.AddDistribution(newDis);
                                //note here no pre is stored
                                currentState.Distributions.Add(newDis);
                                newDis = new Distribution(Constants.TAU);
                            }

                            Distribution newTrivialDis = new Distribution(pstep.Event, nextState);
                            //currentState.AddDistribution(newTrivialDis);
                            currentState.Distributions.Add(newTrivialDis);
                        }
                        else if (currentDistriIndex != -1 && pstep.DisIndex != currentDistriIndex)
                        {
                            //currentState.AddDistribution(newDis);
                            currentState.Distributions.Add(newDis);
                            newDis = new Distribution(Constants.TAU);
                            newDis.AddProbStatePair(pstep.Probability, nextState);
                        }
                        else
                        {
                            newDis.AddProbStatePair(pstep.Probability, nextState);
                        }

                        currentDistriIndex = pstep.DisIndex;
                    }

                    if (currentDistriIndex >= 0)
                    {
                        //currentState.AddDistribution(newDis);
                        currentState.Distributions.Add(newDis);
                    }

                    ExpendedNode.Add(currentID, stepsList);
                }

                if (done)
                {
                    int lowlinkV = nodeData[0];
                    int preorderV = lowlinkV;

                    bool selfLoop = false;
                    foreach (Distribution list in outgoing)
                    {
                        foreach (KeyValuePair<double, MDPState> state in list.States)
                        {
                            string w = state.Value.ID;

                            if (w == currentID)
                            {
                                selfLoop = true;
                            }

                            //if (!MDPState2DRAStateMapping.ContainsKey(w))
                            //{
                            //    if (preorder[w] > preorderV)
                            //    {
                            //        lowlinkV = Math.Min(lowlinkV, lowlink[w]);
                            //    }
                            //    else
                            //    {
                            //        lowlinkV = Math.Min(lowlinkV, preorder[w]);
                            //    }
                            //}

                            int[] wdata = DFSData[w];
                            if (wdata[0] != SCC_FOUND)
                            {
                                if (wdata[0] > preorderV)
                                {
                                    lowlinkV = Math.Min(lowlinkV, wdata[1]);
                                }
                                else
                                {
                                    lowlinkV = Math.Min(lowlinkV, wdata[0]);
                                }
                            }
                        }
                    }

                    nodeData[1] = lowlinkV;
                    working.Pop();

                    if (lowlinkV == preorderV)
                    {
                        if (currentState.ReachTarget)
                        {
                            List<MDPState> SCC = new List<MDPState>();
                            //List<HashSet<MDPState>> Groupings = new List<HashSet<MDPState>>();
                            HashSet<MDPState> Grouping = new HashSet<MDPState>();
                            //bool reduceScc = false;
                            Grouping.Add(currentState);
                            SCC.Add(currentState);
                            //int count = 1;
                            //dtmcSCCstates.Add(currentID);
                            nodeData[0] = SCC_FOUND;
                            while (stepStack.Count > 0 && DFSData[stepStack.Peek().ID][0] > preorderV)
                            {
                                MDPState s = stepStack.Pop();
                                s.ReachTarget = true;
                                string sID = s.ID;
                                //Grouping.Add(s);
                                SCC.Add(s);
                                //dtmcSCCstates.Add(sID);
                                DFSData[sID][0] = SCC_FOUND;
                                //count++;
                            }

                            if (SCC.Count > 1 || selfLoop)
                            {
                                SCCs.Add(SCC);
                                HashSet<MDPState> inputs = new HashSet<MDPState>();
                                inputs.Add(currentState);
                                int Count = SCCs.Count;
                                foreach (var state in SCC)
                                {
                                    state.SCCIndex = Count - 1;
                                }
                                scc2input.Add(currentState.SCCIndex, inputs);

                                HashSet<MDPState> outputs = new HashSet<MDPState>();

                                //input.Add(currentState);
                                foreach (MDPState state in SCC)
                                {
                                    foreach (var distr in state.Distributions)
                                    {
                                        foreach (var KVpair in distr.States)
                                        {
                                            if (!SCC.Contains(KVpair.Value))
                                            {
                                                outputs.Add(KVpair.Value);
                                            }
                                        }
                                    }

                                }
                                List<MDPState> outofscc = new List<MDPState>(outputs);
                                scc2out.Add(SCCs.IndexOf(SCC), outofscc);
                            }
                            //}
                        }
                        else
                        {
                            //dtmcSCCstates.Add(currentID);
                            nodeData[0] = SCC_FOUND;
                            while (stepStack.Count > 0 && DFSData[stepStack.Peek().ID][0] > preorderV)
                            {
                                string sID = stepStack.Pop().ID;
                                DFSData[sID][0] = SCC_FOUND;
                            }
                        }

                    }
                    else
                    {
                        stepStack.Push(pair.Value);
                    }
                }
            } while (working.Count > 0);

            //List<string> EndComponents = new List<string>(SCCs.Count);

            //foreach (List<MDPState> scc in SCCs)
            var localMapSCCsWithOutputSmallSCC = new Dictionary<List<MDPState>, List<MDPState>>();
            while (SCCs.Count > 0)
            {

                for (int i = SCCs.Count - 1; i >= 0; i--)
                {
                    List<MDPState> SCC = SCCs[i];
                    int index;
                    //foreach(var state in SCC)
                    //{
                    //    index = state.SCCIndex;
                    //    break;
                    //}
                    //FindMECDistribution(SCC);
                    if (SCC.Count <= SCCBound)
                    {
                        // SCCReductionGaussianSparseMatrix(new List<MDPState>(SCC), scc2out[index]);
                        localMapSCCsWithOutputSmallSCC.Add(new List<MDPState>(SCC), scc2out[i]);
                        SCCs.RemoveAt(i);
                    }
                    else
                    {
                        List<MDPState> SCCi = new List<MDPState>(SCCs[i]);
                        int Counter = 0;
                        var localMapSCCsWithOutputSubCutSCC = new Dictionary<List<MDPState>, List<MDPState>>();
                        while (Counter < SCCi.Count - SCCBound)
                        {
                            List<MDPState> group = SCCi.GetRange(Counter, SCCBound);
                            HashSet<MDPState> outputs = new HashSet<MDPState>();

                            //input.Add(currentState);
                            foreach (MDPState state in group)
                            {
                                foreach (var Distr in state.Distributions)
                                {
                                    foreach (KeyValuePair<double, MDPState> KVpair in Distr.States)
                                    {
                                        MDPState nextState = KVpair.Value;
                                        if (!group.Contains(nextState))
                                        {
                                            outputs.Add(nextState);
                                        }
                                    }
                                }
                            }

                            // List<MDPState> output = new List<MDPState>(outputs);
                            //SCCReductionGaussianSparseMatrix(group, output);
                            localMapSCCsWithOutputSubCutSCC.Add(group, new List<MDPState>(outputs));
                            //SCCReduction(group, output);
                            Counter += SCCBound;
                        }
                        Parallel.ForEach(localMapSCCsWithOutputSubCutSCC,
                                         subscc2Out =>
                                         SCCReductionGaussianSparseMatrix(subscc2Out.Key, subscc2Out.Value, true));

                        List<MDPState> Group = SCCi.GetRange(Counter, SCCi.Count - Counter);
                        HashSet<MDPState> Outputs = new HashSet<MDPState>();

                        //input.Add(currentState);
                        foreach (MDPState state in Group)
                        {
                            foreach (var Distr in state.Distributions)
                            {
                                foreach (var KVpair in Distr.States)
                                {
                                    MDPState nextState = KVpair.Value;
                                    if (!Group.Contains(nextState))
                                    {
                                        Outputs.Add(nextState);
                                    }
                                }
                            }
                        }

                        List<MDPState> Output = new List<MDPState>(Outputs);

                        //GL: TODO: this one is not in parallel
                        SCCReductionGaussianSparseMatrix(Group, Output, true);

                        //search for the useful subset of SCC that connecting to input states after reduction.
                        HashSet<MDPState> Working = scc2input[i];
                        HashSet<MDPState> visited = new HashSet<MDPState>();
                        do
                        {
                            HashSet<MDPState> newWorking = new HashSet<MDPState>();
                            foreach (var state in Working)
                            {
                                visited.Add(state);
                                foreach (var distr in state.Distributions)
                                {
                                    foreach (var tran in distr.States)
                                    {
                                        MDPState tranV = tran.Value;
                                        if (!visited.Contains(tranV) && SCCs[i].Contains(tranV))
                                        {
                                            newWorking.Add(tranV);
                                        }
                                    }
                                }
                            }
                            Working = newWorking;

                        } while (Working.Count > 0);

                        if (visited.Count > SCCBound && visited.Count < SCCs[i].Count)
                        {
                            SCCs[i] = new List<MDPState>(visited);
                        }
                        else
                        {
                            //List<MDPState> scc = new List<MDPState>(SCCs[i]);
                            // SCCReductionGaussianSparseMatrix(scc, scc2out[index]);
                            //SCCReductionMatlab(scc, scc2out[i]);
                            localMapSCCsWithOutputSmallSCC.Add(new List<MDPState>(visited), scc2out[i]);
                            SCCs.RemoveAt(i);
                        }
                    }

                }
            }
            Parallel.ForEach(localMapSCCsWithOutputSmallSCC,
                             subscc2Out =>
                             SCCReductionGaussianSparseMatrix(subscc2Out.Key, subscc2Out.Value, true));

            VerificationOutput.NoOfStates = VerificationOutput.NoOfStates + mdp.States.Count;
            int counter = 0;
            BuildPRE(mdp, ref counter);

            return mdp;
        }
Exemplo n.º 6
0
        protected MDP BuildMDP_SCC_Cut()
        {
            Stack<KeyValuePair<MDPConfiguration, MDPState>> working = new Stack<KeyValuePair<MDPConfiguration, MDPState>>(1024);

            string initID = InitialStep.GetID();
            MDPState init = new MDPState(initID);
            working.Push(new KeyValuePair<MDPConfiguration, MDPState>(InitialStep as MDPConfiguration, init));
            MDP mdp = new MDP(init, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);

            Stack<MDPState> stepStack = new Stack<MDPState>(1024);
            //MDPState2DRAStateMapping = new Dictionary<string, int>(Common.Classes.Ultility.Ultility.MC_INITIAL_SIZE);
            const int VISITED_NOPREORDER = -1;
            const int SCC_FOUND = -2;

            //DFS data, which mapping each state to an int[] of size 3, first is the pre-order, second is the lowlink, last one is DRAState
            Dictionary<string, int[]> DFSData = new Dictionary<string, int[]>(Ultility.Ultility.MC_INITIAL_SIZE);

            DFSData.Add(initID, new int[] { VISITED_NOPREORDER, 0 });
            //build the MDP while identifying the SCCs
            List<HashSet<MDPState>> SCCs = new List<HashSet<MDPState>>();
            //Dictionary<int, List<MDPState>> scc2out = new Dictionary<int, List<MDPState>>();
            List<HashSet<MDPState>> scc2out = new List<HashSet<MDPState>>();
            List<HashSet<MDPState>> scc2input = new List<HashSet<MDPState>>();
            //Dictionary<int, HashSet<MDPState>> scc2input = new Dictionary<int, HashSet<MDPState>>();
            //Dictionary<string, int> preorder = new Dictionary<string, int>(Common.Classes.Ultility.Ultility.MC_INITIAL_SIZE);
            //Dictionary<string, int> lowlink = new Dictionary<string, int>(Common.Classes.Ultility.Ultility.MC_INITIAL_SIZE);
            int preordercounter = 0;
            Dictionary<string, List<MDPConfiguration>> ExpendedNode = new Dictionary<string, List<MDPConfiguration>>();

            bool reachTarget = true;

            do
            {
                if (CancelRequested)
                {
                    this.VerificationOutput.NoOfStates = this.VerificationOutput.NoOfStates + mdp.States.Count;
                    return mdp;
                }

                KeyValuePair<MDPConfiguration, MDPState> pair = working.Peek();
                MDPConfiguration evt = pair.Key;
                //int DRAState = pair.Key.state;
                string currentID = pair.Key.GetID();
                MDPState currentState = pair.Value;
                List<Distribution> outgoing = currentState.Distributions;

                //if (!preorder.ContainsKey(currentID))
                //{
                //    preorder.Add(currentID, preorderCounter);
                //    preorderCounter++;
                //}

                int[] nodeData = DFSData[currentID];

                if (nodeData[0] == VISITED_NOPREORDER)
                {
                    nodeData[0] = preordercounter;
                    preordercounter++;
                }

                bool done = true;

                if (ExpendedNode.ContainsKey(currentID))
                {
                    if (reachTarget)
                    {
                        currentState.ReachTarget = reachTarget;
                    }
                    else
                    {
                        reachTarget = currentState.ReachTarget;
                    }
                    List<MDPConfiguration> list = ExpendedNode[currentID];
                    if (list.Count > 0)
                    {
                        for (int k = list.Count - 1; k >= 0; k--)
                        {
                            MDPConfiguration step = list[k];

                            string stepID = step.GetID();
                            //if (!preorder.ContainsKey(stepID))
                            if (DFSData[stepID][0] == VISITED_NOPREORDER)
                            {
                                if (done)
                                {
                                    working.Push(new KeyValuePair<MDPConfiguration, MDPState>(step, mdp.States[stepID]));
                                    done = false;
                                    list.RemoveAt(k);
                                }
                            }
                            else
                            {
                                MDPState s = mdp.States[stepID];
                                if (s.ReachTarget)
                                {
                                    reachTarget = true;
                                    currentState.ReachTarget = reachTarget;

                                    if (s.SCCIndex >= 0)
                                    {
                                        scc2input[s.SCCIndex].Add(s);
                                    }

                                }
                                list.RemoveAt(k);
                            }
                        }
                    }
                }
                else
                {
                    reachTarget = false;
                    int currentDistriIndex = -1;
                    Distribution newDis = new Distribution(Constants.TAU);

                    //MDPConfiguration[] steps = evt.MakeOneMoveLocal();
                    IEnumerable<MDPConfiguration> steps = evt.MakeOneMoveLocal();
                    //NOTE: here we play a trick for deadlock case: if a deadlock exist in the MDP, we will make a
                    //self loop transition to remove the deadlock. Deadlock is meaningless in MDP.
                    if (evt.IsDeadLock)
                    {
                        //List<MDPConfiguration> stepsList = new List<MDPConfiguration>(steps);
                        working.Pop();
                        nodeData[0] = SCC_FOUND;
                        continue;
                        //stepsList.Add(CreateSelfLoopStep(evt));
                        //steps = stepsList.ToArray();
                        //HasDeadLock = true;
                    }
                    List<MDPConfiguration> stepsList = new List<MDPConfiguration>(steps);
                    //List<PCSPEventDRAPair> product = Next(steps, DRAState);
                    this.VerificationOutput.Transitions += stepsList.Count;

                    for (int k = stepsList.Count - 1; k >= 0; k--)
                    {
                        MDPConfiguration step = stepsList[k];
                        string tmp = step.GetID();
                        bool target = false;
                        ExpressionValue v = EvaluatorDenotational.Evaluate(ReachableStateCondition, step.GlobalEnv);

                        MDPState nextState;

                        if ((v as BoolConstant).Value)
                        {
                            target = true;
                            if (!DFSData.Keys.Contains(tmp))
                            {
                                DFSData.Add(tmp, new int[] { SCC_FOUND, SCC_FOUND });
                                //    nextState = new MDPState(tmp);
                                //    mdp.States.Add(tmp, nextState);
                                //preordercounter++;
                            }
                            //else if(DFSData[tmp][0] == VISITED_NOPREORDER)
                            //{
                            //    DFSData[tmp][0] = preordercounter;
                            //    preordercounter++;
                            //}
                        }
                        //int nextIndex = VisitedWithID.Count;

                        int[] data;
                        if (mdp.States.TryGetValue(tmp, out nextState))
                        {
                            nextState.TrivialPre = false;
                            DFSData.TryGetValue(tmp, out data);
                            if (!target && data[0] == VISITED_NOPREORDER)
                            {
                                //if (mdp.States.TryGetValue(tmp, out nextState))
                                //{

                                //    if (!preorder.ContainsKey(tmp))
                                //    {
                                if (done)
                                {
                                    working.Push(new KeyValuePair<MDPConfiguration, MDPState>(step, nextState));
                                    done = false;
                                    stepsList.RemoveAt(k);
                                }
                                else
                                {
                                    stepsList[k] = step;
                                }
                            }
                            else
                            {
                                stepsList.RemoveAt(k);
                                MDPState s = mdp.States[tmp];
                                if (s.ReachTarget)
                                {
                                    reachTarget = true;
                                    currentState.ReachTarget = reachTarget;
                                    if (s.SCCIndex >= 0 && !scc2input[s.SCCIndex].Contains(s))
                                    {
                                        scc2input[s.SCCIndex].Add(s);
                                    }
                                }
                            }
                        }
                        else
                        {
                            if (!target)
                            {
                                DFSData.Add(tmp, new int[] { VISITED_NOPREORDER, 0 });
                            }

                            nextState = new MDPState(tmp);
                            mdp.States.Add(tmp, nextState);
                            if (done)
                            {
                                if (target)
                                {
                                    mdp.AddTargetStates(nextState);
                                    reachTarget = true;
                                }
                                else
                                {
                                    working.Push(new KeyValuePair<MDPConfiguration, MDPState>(step, nextState));
                                }

                                done = false;
                                stepsList.RemoveAt(k);
                            }
                            else
                            {
                                if (target)
                                {
                                    stepsList.RemoveAt(k);
                                    mdp.AddTargetStates(nextState);
                                    reachTarget = true;
                                }
                                else
                                {
                                    stepsList[k] = step;
                                }
                            }
                        }

                        MDPConfiguration pstep = step;

                        if (pstep.DisIndex == -1)
                        {
                            if (currentDistriIndex >= 0)
                            {

                                    //note here no pre is stored
                                    currentState.Distributions.Add(newDis);

                                newDis = new Distribution(Constants.TAU);
                            }
                            if (nextState.ID != currentID)//note here self loop distribution is removed; so just used for PMAX
                            {
                                Distribution newTrivialDis = new Distribution(pstep.Event, nextState);

                                currentState.Distributions.Add(newTrivialDis);
                            }

                        }
                        else if (currentDistriIndex != -1 && pstep.DisIndex != currentDistriIndex)
                        {
                           //note here no pre is stored
                            currentState.Distributions.Add(newDis);

                            newDis = new Distribution(Constants.TAU);
                            newDis.AddProbStatePair(pstep.Probability, nextState);
                            nextState.TrivialPre = false;
                        }
                        else
                        {
                            newDis.AddProbStatePair(pstep.Probability, nextState);
                            nextState.TrivialPre = false;
                        }

                        currentDistriIndex = pstep.DisIndex;
                    }

                    if (currentDistriIndex >= 0)
                    {
                        currentState.Distributions.Add(newDis);
                    }

                    ExpendedNode.Add(currentID, stepsList);
                }

                if (done)
                {
                    int lowlinkV = nodeData[0];
                    int preorderV = lowlinkV;

                    bool selfLoop = false;
                    foreach (Distribution list in outgoing)
                    {
                        foreach (KeyValuePair<double, MDPState> state in list.States)
                        {
                            string w = state.Value.ID;

                            if (w == currentID)
                            {
                                selfLoop = true;
                            }

                            int[] wdata = DFSData[w];
                            if (wdata[0] != SCC_FOUND)
                            {
                                if (wdata[0] > preorderV)
                                {
                                    lowlinkV = Math.Min(lowlinkV, wdata[1]);
                                }
                                else
                                {
                                    lowlinkV = Math.Min(lowlinkV, wdata[0]);
                                }
                            }
                        }
                    }

                    nodeData[1] = lowlinkV;
                    working.Pop();

                    if (lowlinkV == preorderV)
                    {
                        if (currentState.ReachTarget)
                        {
                            HashSet<MDPState> SCC = new HashSet<MDPState>();
                            //List<HashSet<MDPState>> Groupings = new List<HashSet<MDPState>>();
                            //HashSet<MDPState> Grouping = new HashSet<MDPState>();
                            //bool reduceScc = false;
                            //Grouping.Add(currentState);
                            SCC.Add(currentState);
                            //int count = 1;
                            //dtmcSCCstates.Add(currentID);
                            nodeData[0] = SCC_FOUND;
                            while (stepStack.Count > 0 && DFSData[stepStack.Peek().ID][0] > preorderV)
                            {
                                MDPState s = stepStack.Pop();
                                s.ReachTarget = true;
                                string sID = s.ID;
                                //Grouping.Add(s);
                                SCC.Add(s);
                                //dtmcSCCstates.Add(sID);
                                DFSData[sID][0] = SCC_FOUND;
                                //count++;
                            }

                            if (SCC.Count > 1 || selfLoop)
                            {
                                SCCs.Add(SCC);
                                HashSet<MDPState> inputs = new HashSet<MDPState>();
                                inputs.Add(currentState);
                                int Count = SCCs.Count;
                                foreach (MDPState state in SCC)
                                {
                                    state.SCCIndex = Count - 1;
                                }
                                scc2input.Add(inputs);

                                HashSet<MDPState> outputs = new HashSet<MDPState>();

                                //input.Add(currentState);
                                foreach (MDPState state in SCC)
                                {
                                    foreach (Distribution distr in state.Distributions)
                                    {
                                        foreach (KeyValuePair<double, MDPState> KVpair in distr.States)
                                        {
                                            if (!SCC.Contains(KVpair.Value))
                                            {
                                                outputs.Add(KVpair.Value);
                                            }
                                        }
                                    }

                                }
                                //List<MDPState> outofscc = new List<MDPState>(outputs);
                                scc2out.Add(outputs);
                            }
                            //}
                        }
                        else
                        {
                            //dtmcSCCstates.Add(currentID);
                            nodeData[0] = SCC_FOUND;
                            while (stepStack.Count > 0 && DFSData[stepStack.Peek().ID][0] > preorderV)
                            {
                                string sID = stepStack.Pop().ID;
                                DFSData[sID][0] = SCC_FOUND;
                            }
                        }

                    }
                    else
                    {
                        stepStack.Push(pair.Value);
                    }
                }
            } while (working.Count > 0);

            RemoveOneTran(SCCs, scc2input);
            for (int i = 0; i < SCCs.Count; i++)
            {
                FindMECDistribution(SCCs[i]);
            }
            if(BFS_CUT)
            {
                BFS_Cut(SCCs, scc2out, scc2input);
            }
            else
            {
                //DFS_CutAutoAdjustTreeLike(SCCs, scc2out, scc2input);
                 DFS_CutAutoAdjust(SCCs, scc2out, scc2input);
                 //DFS_Cut(SCCs, scc2out, scc2input);
            }

            VerificationOutput.NoOfStates = VerificationOutput.NoOfStates + mdp.States.Count;
            int counter = 0;
            BuildPRE(mdp, ref counter);
            return mdp;
        }
Exemplo n.º 7
0
        protected MDP BuildMDP()
        {
            Stack<KeyValuePair<MDPConfiguration, MDPState>> working = new Stack<KeyValuePair<MDPConfiguration, MDPState>>(1024);

            string initID = InitialStep.GetID();
            MDPState init = new MDPState(initID);
            working.Push(new KeyValuePair<MDPConfiguration, MDPState>(InitialStep as MDPConfiguration, init));
            MDP mdp = new MDP(init, Ultility.Ultility.DEFAULT_PRECISION, Ultility.Ultility.MAX_DIFFERENCE);

            do
            {
                if (CancelRequested)
                {
                    VerificationOutput.NoOfStates = mdp.States.Count;
                    return mdp;
                }

                KeyValuePair<MDPConfiguration, MDPState> current = working.Pop();
                IEnumerable<MDPConfiguration> list = current.Key.MakeOneMoveLocal();
                VerificationOutput.Transitions += list.Count();

                int currentDistriIndex = -1;
                Distribution newDis = new Distribution(Constants.TAU);

                //for (int i = 0; i < list.Count; i++)
                foreach (var step in list)
                {
                    //MDPConfiguration step = list[i];
                    string stepID = step.GetID();
                    MDPState nextState;

                    if (!mdp.States.TryGetValue(stepID, out nextState))
                    {
                        nextState = new MDPState(stepID);
                        mdp.AddState(nextState);

                        ExpressionValue v = EvaluatorDenotational.Evaluate(ReachableStateCondition, step.GlobalEnv);

                        if ((v as BoolConstant).Value)
                        {
                            mdp.AddTargetStates(nextState);
                        }
                        else
                        {
                            working.Push(new KeyValuePair<MDPConfiguration, MDPState>(step, nextState));
                        }
                    }

                    if (step.DisIndex == -1)
                    {
                        if (currentDistriIndex >= 0)
                        {
                            current.Value.AddDistribution(newDis);
                            newDis = new Distribution(Constants.TAU);
                        }

                        Distribution newTrivialDis = new Distribution(step.Event);
                        newTrivialDis.AddProbStatePair(1, nextState);
                        current.Value.AddDistribution(newTrivialDis);
                    }
                    else if (currentDistriIndex != -1 && step.DisIndex != currentDistriIndex)
                    {
                        current.Value.AddDistribution(newDis);
                        newDis = new Distribution(Constants.TAU);
                        newDis.AddProbStatePair(step.Probability, nextState);
                    }
                    else
                    {
                        newDis.AddProbStatePair(step.Probability, nextState);
                    }

                    currentDistriIndex = step.DisIndex;
                }

                if (currentDistriIndex >= 0)
                {
                    current.Value.AddDistribution(newDis);
                }
            } while (working.Count > 0);

            VerificationOutput.NoOfStates = mdp.States.Count;
            //mdp.BackUpTargetStates();
            return mdp;
        }
Exemplo n.º 8
0
        private void BuildPRE(MDP mdp, ref int counter)
        {
            HashSet<MDPState> working = new HashSet<MDPState>();
            HashSet<MDPState> visited = new HashSet<MDPState>();
            working.Add(mdp.InitState);
            visited.Add(mdp.InitState);
            do
            {
                HashSet<MDPState> newWorking = new HashSet<MDPState>();
                foreach (MDPState state in working)
                {
                    counter++;
                    foreach (var distr in state.Distributions)
                    {
                        foreach (var tran in distr.States)
                        {

                            MDPState tranV = tran.Value;
                            if (tranV.ReachTarget)
                            {
                                if (!tranV.Pre.Contains(state))
                                {
                                    tranV.Pre.Add(state);
                                }
                                if (!visited.Contains(tranV))
                                {
                                    visited.Add(tranV);
                                    newWorking.Add(tranV);
                                }
                            }
                        }

                    }
                }
                working = newWorking;
            } while (working.Count > 0);

            return;
        }