void TMultimodalGraphImplB::RandomWalk(TVec< TPair<TInt,TInt> > NodeIds, int WalkLength) {
int CurrentLocalNodeId = NodeToModeMapping.GetKey(NodeToModeMapping.GetRndKeyId(TInt::Rnd));
TPair<TInt,TInt> CurrentNodeId = TPair<TInt,TInt>(NodeToModeMapping.GetDat(CurrentLocalNodeId), CurrentLocalNodeId);
int NodeIdIdx = 0;
NodeIds.SetVal(NodeIdIdx++, CurrentNodeId);
while (NodeIds.Len() < WalkLength) {
TNodeI NI = GetNI(CurrentNodeId);
TIntV AdjacentModes = TIntV(); NI.GetAdjacentModes(AdjacentModes);
// Throw an appropriately biased coin here
int EdgeId = TInt::Rnd.GetUniDevInt(NI.GetOutDeg());
int i;
for (i = 0; i < AdjacentModes.Len(); i++) {
int ModeOutDeg = NI.GetOutDeg(AdjacentModes.GetDat(i));
if (EdgeId < ModeOutDeg) { break; }
EdgeId -= ModeOutDeg;
}
NodeIds.SetVal(NodeIdIdx++, TPair<TInt,TInt>(AdjacentModes.GetDat(i), NI.GetOutNId(EdgeId, AdjacentModes.GetDat(i))));
}
}
TMultimodalGraphImplB::TEdgeI TMultimodalGraphImplB::GetEI(const TPair<TInt,TInt>& SrcNId, const TPair<TInt,TInt>& DstNId) const {
TNodeI CurNode = TNodeI(NodeToModeMapping.GetI(SrcNId.GetVal2()), &Graphs, &NodeToModeMapping);
TIntV AdjacentModes = TIntV();
CurNode.GetAdjacentModes(AdjacentModes);
TPair<TInt,TInt> ModeIdsKey = GetModeIdsKey(SrcNId.GetVal1(), DstNId.GetVal1());
int CurAdjacentMode = 0;
for (int i=0; i<AdjacentModes.Len();i++) {
if (AdjacentModes.GetDat(i) == DstNId.GetVal1()) {
CurAdjacentMode=i;
break;
}
}
return TEdgeI(CurNode, EndNI(), Graphs.GetDat(ModeIdsKey).GetEI(SrcNId.GetVal2(), DstNId.GetVal2()).GetCurEdge(), AdjacentModes, CurAdjacentMode);
}