/// Clique Percolation method communities
void TCliqueOverlap::GetCPMCommunities(const PUNGraph& G, int MinMaxCliqueSize, TVec<TIntV>& NIdCmtyVV) {
printf("Clique Percolation Method\n");
TExeTm ExeTm;
TVec<TIntV> MaxCliques;
TCliqueOverlap::GetMaxCliques(G, MinMaxCliqueSize, MaxCliques);
// op RS 2012/05/15, commented out next line, a parameter is missing,
// creating a warning on OS X
// printf("...%d cliques found\n");
// get clique overlap matrix (graph)
PUNGraph OverlapGraph = TCliqueOverlap::CalculateOverlapMtx(MaxCliques, MinMaxCliqueSize-1);
printf("...overlap matrix (%d, %d)\n", G->GetNodes(), G->GetEdges());
// connected components are communities
TCnComV CnComV;
TSnap::GetWccs(OverlapGraph, CnComV);
NIdCmtyVV.Clr(false);
TIntSet CmtySet;
for (int c = 0; c < CnComV.Len(); c++) {
CmtySet.Clr(false);
for (int i = 0; i <CnComV[c].Len(); i++) {
const TIntV& CliqueNIdV = MaxCliques[CnComV[c][i]];
CmtySet.AddKeyV(CliqueNIdV);
}
NIdCmtyVV.Add();
CmtySet.GetKeyV(NIdCmtyVV.Last());
NIdCmtyVV.Last().Sort();
}
printf("done [%s].\n", ExeTm.GetStr());
}
double TAGMUtil::GetConductance(const PUNGraph& Graph, const TIntSet& CmtyS, const int Edges) {
const int Edges2 = Edges >= 0 ? 2*Edges : Graph->GetEdges();
int Vol = 0, Cut = 0;
double Phi = 0.0;
for (int i = 0; i < CmtyS.Len(); i++) {
if (! Graph->IsNode(CmtyS[i])) {
continue;
}
TUNGraph::TNodeI NI = Graph->GetNI(CmtyS[i]);
for (int e = 0; e < NI.GetOutDeg(); e++) {
if (! CmtyS.IsKey(NI.GetOutNId(e))) {
Cut += 1;
}
}
Vol += NI.GetOutDeg();
}
// get conductance
if (Vol != Edges2) {
if (2 * Vol > Edges2) {
Phi = Cut / double (Edges2 - Vol);
}
else if (Vol == 0) {
Phi = 0.0;
}
else {
Phi = Cut / double(Vol);
}
} else {
if (Vol == Edges2) {
Phi = 1.0;
}
}
return Phi;
}
// Compute the empirical edge probability between a pair of nodes who share no community (epsilon), based on current community affiliations.
double TAGMFit::CalcPNoComByCmtyVV(const int& SamplePairs) {
TIntV NIdV;
G->GetNIdV(NIdV);
uint64 PairNoCom = 0, EdgesNoCom = 0;
for (int u = 0; u < NIdV.Len(); u++) {
for (int v = u + 1; v < NIdV.Len(); v++) {
int SrcNID = NIdV[u], DstNID = NIdV[v];
TIntSet JointCom;
TAGMUtil::GetIntersection(NIDComVH.GetDat(SrcNID),NIDComVH.GetDat(DstNID),JointCom);
if(JointCom.Len() == 0) {
PairNoCom++;
if (G->IsEdge(SrcNID, DstNID)) { EdgesNoCom++; }
if (SamplePairs > 0 && PairNoCom >= (uint64) SamplePairs) { break; }
}
}
if (SamplePairs > 0 && PairNoCom >= (uint64) SamplePairs) { break; }
}
double DefaultVal = 1.0 / (double)G->GetNodes() / (double)G->GetNodes();
if (EdgesNoCom > 0) {
PNoCom = (double) EdgesNoCom / (double) PairNoCom;
} else {
PNoCom = DefaultVal;
}
printf("%s / %s edges without joint com detected (PNoCom = %f)\n", TUInt64::GetStr(EdgesNoCom).CStr(), TUInt64::GetStr(PairNoCom).CStr(), PNoCom.Val);
return PNoCom;
}
void end( const TWallVertexVector& vb, TIntVector& polygon, TIntVector& ib )
{
assert( polygonCount );
if( polygonCount == 1 ) {
// trivial case, just output input polygon
polygon.resize( 0 );
polygon.reserve( vertices.size() );
int idx0 = *vertices.begin();
int idx = idx0;
do {
polygon.push_back( idx );
const TIntVector& vnext = vertexNexts[idx];
assert( vnext.size() == 1 );
idx = vnext[0];
} while( idx != idx0 );
triangulator::process( vb, polygon, ib );
} else {
// mark vertex types
markVertexTypes();
// trace and triangulate the polygon(s)
traceBorder( vb, polygon, ib );
}
}
void LSH::ElCheapoHashing(TQuoteBase *QuoteBase, TInt ShingleLen,
THash<TMd5Sig, TIntSet>& ShingleToQuoteIds) {
fprintf(stderr, "Hashing shingles the el cheapo way...\n");
TIntV QuoteIds;
QuoteBase->GetAllQuoteIds(QuoteIds);
for (int qt = 0; qt < QuoteIds.Len(); qt++) {
if (qt % 1000 == 0) {
fprintf(stderr, "%d out of %d completed\n", qt, QuoteIds.Len());
}
TQuote Q;
QuoteBase->GetQuote(QuoteIds[qt], Q);
// Put x-character (or x-word) shingles into hash table; x is specified by ShingleLen parameter
TStr QContentStr;
Q.GetParsedContentString(QContentStr);
TChA QContentChA = TChA(QContentStr);
for (int i = 0; i < QContentChA.Len() - ShingleLen + 1; i++) {
TChA ShingleChA = TChA();
for (int j = 0; j < ShingleLen; j++) {
ShingleChA.AddCh(QContentChA.GetCh(i + j));
}
TStr Shingle = TStr(ShingleChA);
const TMd5Sig ShingleMd5(Shingle);
TIntSet ShingleQuoteIds;
if (ShingleToQuoteIds.IsKey(ShingleMd5)) {
ShingleQuoteIds = ShingleToQuoteIds.GetDat(ShingleMd5);
}
ShingleQuoteIds.AddKey(QuoteIds[qt]);
ShingleToQuoteIds.AddDat(ShingleMd5, ShingleQuoteIds);
}
}
Err("Done with el cheapo hashing!\n");
}
///Generate graph using the AGM model. CProbV = vector of Pc
PUNGraph TAGM::GenAGM(TVec<TIntV>& CmtyVV, const TFltV& CProbV, TRnd& Rnd, const double PNoCom) {
PUNGraph G = TUNGraph::New(100 * CmtyVV.Len(), -1);
printf("AGM begins\n");
for (int i = 0; i < CmtyVV.Len(); i++) {
TIntV& CmtyV = CmtyVV[i];
for (int u = 0; u < CmtyV.Len(); u++) {
if ( G->IsNode(CmtyV[u])) {
continue;
}
G->AddNode(CmtyV[u]);
}
double Prob = CProbV[i];
RndConnectInsideCommunity(G, CmtyV, Prob, Rnd);
}
if (PNoCom > 0.0) { //if we want to connect nodes that do not share any community
TIntSet NIDS;
for (int c = 0; c < CmtyVV.Len(); c++) {
for (int u = 0; u < CmtyVV[c].Len(); u++) {
NIDS.AddKey(CmtyVV[c][u]);
}
}
TIntV NIDV;
NIDS.GetKeyV(NIDV);
RndConnectInsideCommunity(G,NIDV,PNoCom,Rnd);
}
printf("AGM completed (%d nodes %d edges)\n",G->GetNodes(),G->GetEdges());
G->Defrag();
return G;
}
bool TBagOfWords::Update(const TStrV& TokenStrV) {
// Generate Ngrams if necessary
TStrV NgramStrV;
GenerateNgrams(TokenStrV, NgramStrV);
// process tokens to update DF counts
bool UpdateP = false;
if (IsHashing()) {
// consolidate tokens and get their hashed IDs
TIntSet TokenIdH;
for (int TokenStrN = 0; TokenStrN < NgramStrV.Len(); TokenStrN++) {
const TStr& TokenStr = NgramStrV[TokenStrN];
TInt TokenId = TokenStr.GetHashTrick() % HashDim;
TokenIdH.AddKey(TokenId);
if (IsStoreHashWords()) { HashWordV[TokenId].AddKey(TokenStr); }
}
// update document counts
int KeyId = TokenIdH.FFirstKeyId();
while (TokenIdH.FNextKeyId(KeyId)) {
const int TokenId = TokenIdH.GetKey(KeyId);
// update DF
DocFqV[TokenId]++;
}
} else {
// consolidate tokens
TStrH TokenStrH;
for (int TokenStrN = 0; TokenStrN < NgramStrV.Len(); TokenStrN++) {
const TStr& TokenStr = NgramStrV[TokenStrN];
TokenStrH.AddKey(TokenStr);
}
// update document counts and update vocabulary with new tokens
int KeyId = TokenStrH.FFirstKeyId();
while (TokenStrH.FNextKeyId(KeyId)) {
// get token
const TStr& TokenStr = TokenStrH.GetKey(KeyId);
// different processing for hashing
int TokenId = TokenSet.GetKeyId(TokenStr);
if (TokenId == -1) {
// new token, remember the dimensionality change
UpdateP = true;
// remember the new token
TokenId = TokenSet.AddKey(TokenStr);
// increase document count table
const int TokenDfId = DocFqV.Add(0);
// increase also the old count table
OldDocFqV.Add(0.0);
// make sure we DF vector and TokenSet still in sync
IAssert(TokenId == TokenDfId);
IAssert(DocFqV.Len() == OldDocFqV.Len());
}
// document count update
DocFqV[TokenId]++;
}
}
// update document count
Docs++;
// tell if dimension changed
return UpdateP;
}
double TAGMFit::SelectLambdaSum(const TFltV& NewLambdaV, const TIntSet& ComK) {
double Result = 0.0;
for (TIntSet::TIter SI = ComK.BegI(); SI < ComK.EndI(); SI++) {
IAssert(NewLambdaV[SI.GetKey()] >= 0);
Result += NewLambdaV[SI.GetKey()];
}
return Result;
}
void TAGMUtil::GetNbhCom(const PUNGraph& Graph, const int NID, TIntSet& NBCmtyS) {
TUNGraph::TNodeI NI = Graph->GetNI(NID);
NBCmtyS.Gen(NI.GetDeg());
NBCmtyS.AddKey(NID);
for (int e = 0; e < NI.GetDeg(); e++) {
NBCmtyS.AddKey(NI.GetNbrNId(e));
}
}
// YES I COPIED AND PASTED CODE my section leader would be so ashamed :D
void LSH::MinHash(THash<TMd5Sig, TIntSet>& ShingleToQuoteIds,
TVec<THash<TIntV, TIntSet> >& SignatureBandBuckets) {
TRnd RandomGenerator; // TODO: make this "more random" by incorporating time
for (int i = 0; i < NumBands; ++i) {
THash < TInt, TIntV > Inverted; // (QuoteID, QuoteSignatureForBand)
THash < TIntV, TIntSet > BandBuckets; // (BandSignature, QuoteIDs)
for (int j = 0; j < BandSize; ++j) {
// Create new signature
TVec < TMd5Sig > Signature;
ShingleToQuoteIds.GetKeyV(Signature);
Signature.Shuffle(RandomGenerator);
// Place in bucket - not very efficient
int SigLen = Signature.Len();
for (int k = 0; k < SigLen; ++k) {
TIntSet CurSet = ShingleToQuoteIds.GetDat(Signature[k]);
for (TIntSet::TIter l = CurSet.BegI(); l < CurSet.EndI(); l++) {
TInt Key = l.GetKey();
if (Inverted.IsKey(Key)) {
TIntV CurSignature = Inverted.GetDat(Key);
if (CurSignature.Len() <= j) {
CurSignature.Add(k);
Inverted.AddDat(Key, CurSignature);
}
} else {
TIntV NewSignature;
NewSignature.Add(k);
Inverted.AddDat(Key, NewSignature);
}
}
}
}
TIntV InvertedKeys;
Inverted.GetKeyV(InvertedKeys);
TInt InvertedLen = InvertedKeys.Len();
for (int k = 0; k < InvertedLen; ++k) {
TIntSet Bucket;
TIntV Signature = Inverted.GetDat(InvertedKeys[k]);
if (BandBuckets.IsKey(Signature)) {
Bucket = BandBuckets.GetDat(Signature);
}
Bucket.AddKey(InvertedKeys[k]);
BandBuckets.AddDat(Signature, Bucket);
}
SignatureBandBuckets.Add(BandBuckets);
Err("%d out of %d band signatures computed\n", i + 1, NumBands);
}
Err("Minhash step complete!\n");
}
// Helper: Return GroupSet based on NodeID
void GetGroupSet(int NId, TIntSet& GroupSet) {
GroupSet.Clr();
switch (NId) {
case 0:
GroupSet.AddKey(2);
GroupSet.AddKey(4);
GroupSet.AddKey(5);
break;
case 1:
// Empty Set
break;
case 2:
GroupSet.AddKey(0);
GroupSet.AddKey(3);
GroupSet.AddKey(5);
break;
case 3:
GroupSet.AddKey(0);
break;
case 4:
GroupSet.AddKey(0);
break;
case 5:
GroupSet.AddKey(0);
GroupSet.AddKey(1);
break;
default:
ASSERT_FALSE(true); // NId Outside Graph Construction FAIL
break;
}
}
void TNetInfBs::SavePajek(const TStr& OutFNm) {
TIntSet NIdSet;
FILE *F = fopen(OutFNm.CStr(), "wt");
fprintf(F, "*Vertices %d\r\n", NIdSet.Len());
for (THash<TInt, TNodeInfo>::TIter NI = NodeNmH.BegI(); NI < NodeNmH.EndI(); NI++) {
const TNodeInfo& I = NI.GetDat();
fprintf(F, "%d \"%s\" ic Blue x_fact %f y_fact %f\r\n", NI.GetKey().Val,
I.Name.CStr(), TMath::Mx<double>(log((double)I.Vol)-5,1), TMath::Mx<double>(log((double)I.Vol)-5,1));
}
fprintf(F, "*Arcs\r\n");
for (TNGraph::TEdgeI EI = Graph->BegEI(); EI < Graph->EndEI(); EI++) {
fprintf(F, "%d %d 1\r\n", EI.GetSrcNId(), EI.GetDstNId());
}
fclose(F);
}
void begin( int totalVerts )
{
polygonCount = 0;
vertices.clear();
borderVertices.clear();
vertexNexts.clear();
vertexPrevs.clear();
vertexUseCount.resize( 0 );
vertexUseCount.resize( totalVerts, 0 );
vertexTraceID.resize( totalVerts, -1 );
vertexTypes.resize( 0 );
vertexTypes.resize( totalVerts, VTYPE_NONE );
}
void TGraphKey::TakeGraph(const PNGraph& Graph, TIntPrV& NodeMap) {
TIntSet NodeIdH;
int n = 0;
NodeMap.Gen(Graph->GetNodes(), 0);
for (TNGraph::TNodeI NI = Graph->BegNI(); NI < Graph->EndNI(); NI++, n++) {
NodeIdH.AddKey(NI.GetId());
NodeMap.Add(TIntPr(NI.GetId(), n));
}
Nodes = Graph->GetNodes();
EdgeV.Gen(Nodes, 0);
for (TNGraph::TNodeI NI = Graph->BegNI(); NI < Graph->EndNI(); NI++) {
const int NewNId = NodeIdH.GetKeyId(NI.GetId());
for (int i = 0; i < NI.GetOutDeg(); i++) {
EdgeV.Add(TIntPr(NewNId, NodeIdH.GetKeyId(NI.GetOutNId(i))));
}
}
EdgeV.Sort(true);
EdgeV.Pack();
}
// For each (u, v) in edges, precompute C_uv (the set of communities u and v share).
void TAGMFit::GetEdgeJointCom() {
ComEdgesV.Gen(CIDNSetV.Len());
EdgeComVH.Gen(G->GetEdges());
for (TUNGraph::TNodeI SrcNI = G->BegNI(); SrcNI < G->EndNI(); SrcNI++) {
int SrcNID = SrcNI.GetId();
for (int v = 0; v < SrcNI.GetDeg(); v++) {
int DstNID = SrcNI.GetNbrNId(v);
if (SrcNID >= DstNID) { continue; }
TIntSet JointCom;
IAssert(NIDComVH.IsKey(SrcNID));
IAssert(NIDComVH.IsKey(DstNID));
TAGMUtil::GetIntersection(NIDComVH.GetDat(SrcNID), NIDComVH.GetDat(DstNID), JointCom);
EdgeComVH.AddDat(TIntPr(SrcNID,DstNID),JointCom);
for (int k = 0; k < JointCom.Len(); k++) {
ComEdgesV[JointCom[k]]++;
}
}
}
IAssert(EdgeComVH.Len() == G->GetEdges());
}
void QuoteGraph::CompareUsingShingles(THash<TMd5Sig, TIntSet>& Shingles) {
int Count = 0;
int RealCount = 0;
TVec<TMd5Sig> ShingleKeys;
Shingles.GetKeyV(ShingleKeys);
THashSet<TIntPr> EdgeCache;
for (int i = 0; i < ShingleKeys.Len(); i++) {
if (i % 100 == 0) {
Err("Processed %d out of %d shingles, count = %d\n", i, ShingleKeys.Len(), Count);
}
TIntSet Bucket;
Shingles.IsKeyGetDat(ShingleKeys[i], Bucket);
for (TIntSet::TIter Quote1 = Bucket.BegI(); Quote1 < Bucket.EndI(); Quote1++) {
TIntSet::TIter Quote1Copy = Quote1;
Quote1Copy++;
for (TIntSet::TIter Quote2 = Quote1Copy; Quote2 < Bucket.EndI(); Quote2++) {
if (!EdgeCache.IsKey(TIntPr(Quote1.GetKey(), Quote2.GetKey())) && !EdgeCache.IsKey(TIntPr(Quote2.GetKey(), Quote1.GetKey()))) {
EdgeCache.AddKey(TIntPr(Quote1.GetKey(), Quote2.GetKey()));
EdgeCache.AddKey(TIntPr(Quote2.GetKey(), Quote1.GetKey()));
RealCount++;
AddEdgeIfSimilar(Quote1.GetKey(), Quote2.GetKey());
}
}
}
int Len = Bucket.Len() * (Bucket.Len() - 1) / 2;
Count += Len;
}
fprintf(stderr, "NUMBER OF COMPARES: %d\n", Count);
fprintf(stderr, "NUMBER OF REAL COMPARES: %d\n", RealCount);
}
// I embarassingly don't know how templating works.
void QuoteGraph::CompareUsingMinHash(TVec<THash<TMd5Sig, TIntSet> >& BucketsVector) {
THashSet<TIntPr> EdgeCache;
int Count = 0;
int RealCount = 0;
Err("Beginning edge creation step...\n");
for (int i = 0; i < BucketsVector.Len(); i++) {
Err("Processing band signature %d of %d - %d signatures\n", i+1, BucketsVector.Len(), BucketsVector[i].Len());
TVec<TMd5Sig> Buckets;
BucketsVector[i].GetKeyV(Buckets);
TVec<TMd5Sig>::TIter BucketEnd = Buckets.EndI();
for (TVec<TMd5Sig>::TIter BucketSig = Buckets.BegI(); BucketSig < BucketEnd; BucketSig++) {
TIntSet Bucket = BucketsVector[i].GetDat(*BucketSig);
Count += Bucket.Len() * (Bucket.Len() - 1) / 2;
for (TIntSet::TIter Quote1 = Bucket.BegI(); Quote1 < Bucket.EndI(); Quote1++) {
TIntSet::TIter Quote1Copy = Quote1;
Quote1Copy++;
for (TIntSet::TIter Quote2 = Quote1Copy; Quote2 < Bucket.EndI(); Quote2++) {
if (!EdgeCache.IsKey(TIntPr(Quote1.GetKey(), Quote2.GetKey())) && !EdgeCache.IsKey(TIntPr(Quote2.GetKey(), Quote1.GetKey()))) {
EdgeCache.AddKey(TIntPr(Quote1.GetKey(), Quote2.GetKey()));
EdgeCache.AddKey(TIntPr(Quote2.GetKey(), Quote1.GetKey()));
RealCount++;
AddEdgeIfSimilar(Quote1.GetKey(), Quote2.GetKey());
}
}
}
}
}
fprintf(stderr, "NUMBER OF COMPARES: %d\n", Count);
fprintf(stderr, "NUMBER OF REAL COMPARES: %d\n", RealCount);
}
void TGStatVec::SaveTxt(const TStr& FNmPref, const TStr& Desc) const {
FILE *F = fopen(TStr::Fmt("growth.%s.tab", FNmPref.CStr()).CStr(), "wt");
fprintf(F, "# %s\n", Desc.CStr());
fprintf(F, "# %s", TTmInfo::GetTmUnitStr(TmUnit).CStr());
TIntSet StatValSet;
for (int i = 0; i < Len(); i++) {
for (int v = gsvNone; v < gsvMx; v++) {
if (At(i)->HasVal(TGStatVal(v))) { StatValSet.AddKey(v); }
}
}
TIntV StatValV; StatValSet.GetKeyV(StatValV); StatValV.Sort();
for (int sv = 0; sv < StatValV.Len(); sv++) {
fprintf(F, "\t%s", TGStat::GetValStr(TGStatVal(StatValV[sv].Val)).CStr()); }
fprintf(F, "Time\n");
for (int i = 0; i < Len(); i++) {
const TGStat& G = *At(i);
for (int sv = 0; sv < StatValV.Len(); sv++) {
fprintf(F, "%g\t", G.GetVal(TGStatVal(StatValV[sv].Val))); }
fprintf(F, "%s\n", G.GetTmStr().CStr());
}
fclose(F);
}
void markVertexTypes()
{
TIntSet::const_iterator vit, vitEnd = vertices.end();
// first pass: mark all interior and single-border vertices
for( vit = vertices.begin(); vit != vitEnd; ++vit ) {
int idx = *vit;
if( vertexUseCount[idx] == 1 ) {
vertexTypes[idx] = VTYPE_SINGLE;
borderVertices.insert( idx );
} else if( isVertexInterior(idx) )
vertexTypes[idx] = VTYPE_INTERIOR;
}
// now, the unmarked vertices are all shared and on border
for( vit = vertices.begin(); vit != vitEnd; ++vit ) {
int idx = *vit;
if( vertexTypes[idx] == VTYPE_NONE ) {
vertexTypes[idx] = VTYPE_MULTI;
borderVertices.insert( idx );
}
}
}
void addPolygon( const TIntVector& ib )
{
++polygonCount;
TIntVector::const_iterator vit, vitEnd = ib.end();
for( vit = ib.begin(); vit != vitEnd; ++vit ) {
int idx = *vit;
assert( idx >= 0 && idx < vertexUseCount.size() );
vertices.insert( idx );
++vertexUseCount[idx];
int idxNext = (vit==vitEnd-1) ? ib.front() : *(vit+1);
int idxPrev = (vit==ib.begin()) ? ib.back() : *(vit-1);
vertexNexts[idx].push_back( idxNext );
vertexPrevs[idx].push_back( idxPrev );
}
}
void LSH::WordHashing(TQuoteBase *QuoteBase,
THash<TMd5Sig, TIntSet>& ShingleToQuoteIds) {
fprintf(stderr, "Hashing shingles using words...\n");
TIntV QuoteIds;
QuoteBase->GetAllQuoteIds(QuoteIds);
THash<TStr, TIntSet> Temp;
for (int qt = 0; qt < QuoteIds.Len(); qt++) {
if (qt % 1000 == 0) {
fprintf(stderr, "%d out of %d completed\n", qt, QuoteIds.Len());
}
TQuote Q;
QuoteBase->GetQuote(QuoteIds[qt], Q);
TStrV Content;
Q.GetParsedContent(Content);
int ContentLen = Content.Len();
for (int i = 0; i < ContentLen; i++) {
const TMd5Sig ShingleMd5(Content[i]);
TIntSet ShingleQuoteIds;
ShingleToQuoteIds.IsKeyGetDat(ShingleMd5, ShingleQuoteIds);
ShingleQuoteIds.AddKey(QuoteIds[qt]);
ShingleToQuoteIds.AddDat(ShingleMd5, ShingleQuoteIds);
///// COMMENT OUT LATER
TIntSet TempSet;
Temp.IsKeyGetDat(Content[i], TempSet);
TempSet.AddKey(QuoteIds[qt]);
Temp.AddDat(Content[i], TempSet);
}
}
TVec<TStr> ShingleKeys;
Temp.GetKeyV(ShingleKeys);
ShingleKeys.SortCmp(TCmpSetByLen(false, &Temp));
for (int i = 0; i < 100; i++) {
TIntSet TempSet = Temp.GetDat(ShingleKeys[i]);
Err("%d: %s - %d \n", i, ShingleKeys[i].CStr(), TempSet.Len());
}
Err("Done with word hashing!\n");
}
/// Barabasi-Albert model of scale-free graphs.
/// The graph has power-law degree distribution.
/// See: Emergence of scaling in random networks by Barabasi and Albert.
/// URL: http://arxiv.org/abs/cond-mat/9910332
PUNGraph GenPrefAttach(const int& Nodes, const int& NodeOutDeg, TRnd& Rnd) {
PUNGraph GraphPt = PUNGraph::New();
TUNGraph& Graph = *GraphPt;
Graph.Reserve(Nodes, NodeOutDeg*Nodes);
TIntV NIdV(NodeOutDeg*Nodes, 0);
// first edge
Graph.AddNode(0); Graph.AddNode(1);
NIdV.Add(0); NIdV.Add(1);
Graph.AddEdge(0, 1);
TIntSet NodeSet;
for (int node = 2; node < Nodes; node++) {
NodeSet.Clr(false);
while (NodeSet.Len() < NodeOutDeg && NodeSet.Len() < node) {
NodeSet.AddKey(NIdV[TInt::Rnd.GetUniDevInt(NIdV.Len())]);
}
const int N = Graph.AddNode();
for (int i = 0; i < NodeSet.Len(); i++) {
Graph.AddEdge(N, NodeSet[i]);
NIdV.Add(N);
NIdV.Add(NodeSet[i]);
}
}
return GraphPt;
}
// Simple test for Defrag()
TEST(THashSet, Defrag) {
TIntSet* TestSet = new TIntSet();
// fragment the set (IsKeyIdEqKeyN() will be false)
TestSet->AddKey(6);
TestSet->AddKey(4);
EXPECT_EQ(1,TestSet->IsKeyIdEqKeyN());
TestSet->AddKey(2);
EXPECT_EQ(1,TestSet->IsKeyIdEqKeyN());
TestSet->DelKey(2);
EXPECT_EQ(0,TestSet->IsKeyIdEqKeyN());
TestSet->Defrag();
EXPECT_EQ(1,TestSet->IsKeyIdEqKeyN());
TestSet->DelKey(4);
EXPECT_EQ(0,TestSet->IsKeyIdEqKeyN());
TestSet->Defrag();
EXPECT_EQ(1,TestSet->IsKeyIdEqKeyN());
// this does not work with a fragmented set
TestSet->DelKeyId(TestSet->GetRndKeyId(TInt::Rnd));
EXPECT_EQ(0,TestSet->IsKeyIdEqKeyN());
delete TestSet;
}
void traceBorder( const TWallVertexVector& vb, TIntVector& polygon, TIntVector& ib )
{
static int traceID = 0;
++traceID;
int idx0 = getBorderIndex();
assert( idx0 >= 0 && idx0 < vertexTypes.size() );
ib.resize( 0 );
polygon.resize( 0 );
polygon.reserve( vertices.size()/2 );
TIntVector localPolygon;
localPolygon.reserve( 128 );
TIntVector localIB;
localIB.reserve( 128 );
int idxPrev = idx0;
int idx = idx0;
int debugCounter = 0;
int debugLoopCounter = 0;
do {
localIB.resize( 0 );
bool willFormLoop;
do{
localPolygon.push_back( idx );
borderVertices.erase( idx );
vertexTraceID[idx] = traceID;
assert( ++debugCounter <= vertices.size()*2 );
// Next vertex is the neighbor of current, that is not interior
// and that is not the previous one.
// When there are many possible ones, trace based on angle.
int idxNext = -1;
SVector2 prevToCurr = vb[idx] - vb[idxPrev];
if( prevToCurr.lengthSq() < 1.0e-6f )
prevToCurr.set( -0.01f, -0.01f );
TIntIntsMap::const_iterator it;
it = vertexNexts.find( idx );
assert( it != vertexNexts.end() );
const TIntVector& vnext = it->second;
int n = vnext.size();
float bestAngle = 100.0f;
for( int i = 0; i < n; ++i ) {
int idx1 = vnext[i];
if( idx1 != idxPrev && vertexTypes[idx1] != VTYPE_INTERIOR ) {
//if( idx1 != idxPrev ) {
SVector2 currToNext = vb[idx1] - vb[idx];
float ang = signedAngle2D( prevToCurr, currToNext );
if( ang < bestAngle ) {
bestAngle = ang;
idxNext = idx1;
}
}
}
assert( bestAngle > -4.0f && bestAngle < 4.0f );
assert( idxNext >= 0 );
willFormLoop = (vertexTraceID[idxNext] == traceID);
// Optimization: if best angle is zero, then we're walking
// in a straight line. Optimize out the current vertex.
if( bestAngle == 0.0f && idx != idx0 && !willFormLoop ) {
localPolygon.pop_back();
}
idxPrev = idx;
idx = idxNext;
} while( !willFormLoop );
assert( localPolygon.size() >= 3 );
//if( localPolygon.size() < 3 ) {
// return;
//}
assert( ++debugLoopCounter < vertices.size() );
if( idx == idx0 ) {
// The polygon is simple or we found the last loop.
// Triangulate local and append to results.
triangulator::process( vb, localPolygon, localIB );
polygon.insert( polygon.end(), localPolygon.begin(), localPolygon.end() );
ib.insert( ib.end(), localIB.begin(), localIB.end() );
// We can have separated other loops. Try fetching them as well.
idx0 = getBorderIndex();
if( idx0 == -1 ) {
return;
} else {
localPolygon.resize( 0 );
idxPrev = idx0;
idx = idx0;
}
} else {
// The polygon must be complex, and we just found a closed loop.
// Take only the loop, triangulate it, append to results, continue.
TIntVector::const_iterator itLoopStart =
std::find( localPolygon.begin(), localPolygon.end(), idx );
assert( itLoopStart != localPolygon.end() );
// append to results
TIntVector loopPolygon( itLoopStart, localPolygon.end() );
triangulator::process( vb, loopPolygon, localIB );
polygon.insert( polygon.end(), loopPolygon.begin(), loopPolygon.end() );
ib.insert( ib.end(), localIB.begin(), localIB.end() );
// continue - remove the looped polygon from local
localPolygon.resize( itLoopStart - localPolygon.begin() );
}
} while( true );
}
int getBorderIndex()
{
if( borderVertices.empty() )
return -1;
return *borderVertices.begin();
}
void LSH::MinHash(TQuoteBase *QB, THashSet<TMd5Sig>& Shingles,
TVec<THash<TMd5Sig, TIntSet> >& SignatureBandBuckets) {
Err("Creating buckets...\n");
THash < TMd5Sig, TIntV > Signatures;
ComputeSignatures(Shingles, Signatures, NumBands * BandSize);
// bucket creation
for (int i = 0; i < NumBands; ++i) {
SignatureBandBuckets.Add(THash<TMd5Sig, TIntSet>());
}
// bucket filling
int NumShingles = Shingles.Len();
THash<TInt, TQuote> Quotes;
QB->GetIdToTQuotes(Quotes);
THash<TInt, TQuote>::TIter CurI = Quotes.BegI();
THash<TInt, TQuote>::TIter EndI = Quotes.EndI();
TQuote Q; // SKYFALL
for (; CurI < EndI; CurI++) {
Q = CurI.GetDat();
TStrV Content;
Q.GetParsedContent(Content);
TInt Id = Q.GetId();
// signature for quote
int ContentLen = Content.Len();
TVec < TIntV > Signature;
for (int i = 0; i < ContentLen; i++) {
const TMd5Sig ShingleMd5(Content[i]);
Signature.Add(Signatures.GetDat(ShingleMd5));
}
// place in bucket
if (ContentLen < WordWindow) {
for (int i = 0; i < NumBands; ++i) {
TStr Sig;
for (int j = 0; j < BandSize; ++j) {
int CurSig = i * BandSize + j;
TInt min = NumShingles;
for (int k = 0; k < ContentLen; k++) {
if (Signature[k][CurSig] < min) {
min = Signature[k][CurSig];
}
}
Sig += min.GetStr() + "-";
}
//Err(Sig.CStr());
const TMd5Sig SigMd5(Sig);
TIntSet Bucket;
SignatureBandBuckets[i].IsKeyGetDat(SigMd5, Bucket);
Bucket.AddKey(Id);
SignatureBandBuckets[i].AddDat(SigMd5, Bucket);
}
} else {
}
}
Err("Minhash step complete!\n");
}
/// Newton method: DEPRECATED
int TAGMFast::MLENewton(const double& Thres, const int& MaxIter, const TStr PlotNm) {
TExeTm ExeTm;
int iter = 0, PrevIter = 0;
TIntFltPrV IterLV;
double PrevL = TFlt::Mn, CurL;
TUNGraph::TNodeI UI;
TIntV NIdxV;
G->GetNIdV(NIdxV);
int CID, UID, NewtonIter;
double Fuc, PrevFuc, Grad, H;
while(iter < MaxIter) {
NIdxV.Shuffle(Rnd);
for (int ui = 0; ui < F.Len(); ui++, iter++) {
if (! PlotNm.Empty() && iter % G->GetNodes() == 0) {
IterLV.Add(TIntFltPr(iter, Likelihood(false)));
}
UID = NIdxV[ui];
//find set of candidate c (we only need to consider c to which a neighbor of u belongs to)
TIntSet CIDSet;
UI = G->GetNI(UID);
if (UI.GetDeg() == 0) { //if the node is isolated, clear its membership and skip
if (! F[UID].Empty()) { F[UID].Clr(); }
continue;
}
for (int e = 0; e < UI.GetDeg(); e++) {
if (HOVIDSV[UID].IsKey(UI.GetNbrNId(e))) { continue; }
TIntFltH& NbhCIDH = F[UI.GetNbrNId(e)];
for (TIntFltH::TIter CI = NbhCIDH.BegI(); CI < NbhCIDH.EndI(); CI++) {
CIDSet.AddKey(CI.GetKey());
}
}
for (TIntFltH::TIter CI = F[UID].BegI(); CI < F[UID].EndI(); CI++) { //remove the community membership which U does not share with its neighbors
if (! CIDSet.IsKey(CI.GetKey())) {
DelCom(UID, CI.GetKey());
}
}
if (CIDSet.Empty()) { continue; }
for (TIntSet::TIter CI = CIDSet.BegI(); CI < CIDSet.EndI(); CI++) {
CID = CI.GetKey();
//optimize for UID, CID
//compute constants
TFltV AlphaKV(UI.GetDeg());
for (int e = 0; e < UI.GetDeg(); e++) {
if (HOVIDSV[UID].IsKey(UI.GetNbrNId(e))) { continue; }
AlphaKV[e] = (1 - PNoCom) * exp(- DotProduct(UID, UI.GetNbrNId(e)) + GetCom(UI.GetNbrNId(e), CID) * GetCom(UID, CID));
IAssertR(AlphaKV[e] <= 1.0, TStr::Fmt("AlphaKV=%f, %f, %f", AlphaKV[e].Val, PNoCom.Val, GetCom(UI.GetNbrNId(e), CID)));
}
Fuc = GetCom(UID, CID);
PrevFuc = Fuc;
Grad = GradientForOneVar(AlphaKV, UID, CID, Fuc), H = 0.0;
if (Grad <= 1e-3 && Grad >= -0.1) { continue; }
NewtonIter = 0;
while (NewtonIter++ < 10) {
Grad = GradientForOneVar(AlphaKV, UID, CID, Fuc), H = 0.0;
H = HessianForOneVar(AlphaKV, UID, CID, Fuc);
if (Fuc == 0.0 && Grad <= 0.0) { Grad = 0.0; }
if (fabs(Grad) < 1e-3) { break; }
if (H == 0.0) { Fuc = 0.0; break; }
double NewtonStep = - Grad / H;
if (NewtonStep < -0.5) { NewtonStep = - 0.5; }
Fuc += NewtonStep;
if (Fuc < 0.0) { Fuc = 0.0; }
}
if (Fuc == 0.0) {
DelCom(UID, CID);
}
else {
AddCom(UID, CID, Fuc);
}
}
}
if (iter - PrevIter >= 2 * G->GetNodes() && iter > 10000) {
PrevIter = iter;
CurL = Likelihood();
if (PrevL > TFlt::Mn && ! PlotNm.Empty()) {
printf("\r%d iterations, Likelihood: %f, Diff: %f", iter, CurL, CurL - PrevL);
}
fflush(stdout);
if (CurL - PrevL <= Thres * fabs(PrevL)) { break; }
else { PrevL = CurL; }
}
}
if (! PlotNm.Empty()) {
printf("\nMLE for Lambda completed with %d iterations(%s)\n", iter, ExeTm.GetTmStr());
TGnuPlot::PlotValV(IterLV, PlotNm + ".likelihood_Q");
}
return iter;
}
void TAGMFast::GradientForRow(const int UID, TIntFltH& GradU, const TIntSet& CIDSet) {
GradU.Gen(CIDSet.Len());
TFltV HOSumFV; //adjust for Fv of v hold out
if (HOVIDSV[UID].Len() > 0) {
HOSumFV.Gen(SumFV.Len());
for (int e = 0; e < HOVIDSV[UID].Len(); e++) {
for (int c = 0; c < SumFV.Len(); c++) {
HOSumFV[c] += GetCom(HOVIDSV[UID][e], c);
}
}
}
TUNGraph::TNodeI NI = G->GetNI(UID);
int Deg = NI.GetDeg();
TFltV PredV(Deg), GradV(CIDSet.Len());
TIntV CIDV(CIDSet.Len());
if (DoParallel && Deg + CIDSet.Len() > 10) {
#pragma omp parallel for schedule(static, 1)
for (int e = 0; e < Deg; e++) {
if (NI.GetNbrNId(e) == UID) { continue; }
if (HOVIDSV[UID].IsKey(NI.GetNbrNId(e))) { continue; }
PredV[e] = Prediction(UID, NI.GetNbrNId(e));
}
#pragma omp parallel for schedule(static, 1)
for (int c = 0; c < CIDSet.Len(); c++) {
int CID = CIDSet.GetKey(c);
double Val = 0.0;
for (int e = 0; e < Deg; e++) {
int VID = NI.GetNbrNId(e);
if (VID == UID) { continue; }
if (HOVIDSV[UID].IsKey(VID)) { continue; }
Val += PredV[e] * GetCom(VID, CID) / (1.0 - PredV[e]) + NegWgt * GetCom(VID, CID);
}
double HOSum = HOVIDSV[UID].Len() > 0? HOSumFV[CID].Val: 0.0;//subtract Hold out pairs only if hold out pairs exist
Val -= NegWgt * (SumFV[CID] - HOSum - GetCom(UID, CID));
CIDV[c] = CID;
GradV[c] = Val;
}
}
else {
for (int e = 0; e < Deg; e++) {
if (NI.GetNbrNId(e) == UID) { continue; }
if (HOVIDSV[UID].IsKey(NI.GetNbrNId(e))) { continue; }
PredV[e] = Prediction(UID, NI.GetNbrNId(e));
}
for (int c = 0; c < CIDSet.Len(); c++) {
int CID = CIDSet.GetKey(c);
double Val = 0.0;
for (int e = 0; e < Deg; e++) {
int VID = NI.GetNbrNId(e);
if (VID == UID) { continue; }
if (HOVIDSV[UID].IsKey(VID)) { continue; }
Val += PredV[e] * GetCom(VID, CID) / (1.0 - PredV[e]) + NegWgt * GetCom(VID, CID);
}
double HOSum = HOVIDSV[UID].Len() > 0? HOSumFV[CID].Val: 0.0;//subtract Hold out pairs only if hold out pairs exist
Val -= NegWgt * (SumFV[CID] - HOSum - GetCom(UID, CID));
CIDV[c] = CID;
GradV[c] = Val;
}
}
//add regularization
if (RegCoef > 0.0) { //L1
for (int c = 0; c < GradV.Len(); c++) {
GradV[c] -= RegCoef;
}
}
if (RegCoef < 0.0) { //L2
for (int c = 0; c < GradV.Len(); c++) {
GradV[c] += 2 * RegCoef * GetCom(UID, CIDV[c]);
}
}
for (int c = 0; c < GradV.Len(); c++) {
if (GetCom(UID, CIDV[c]) == 0.0 && GradV[c] < 0.0) { continue; }
if (fabs(GradV[c]) < 0.0001) { continue; }
GradU.AddDat(CIDV[c], GradV[c]);
}
for (int c = 0; c < GradU.Len(); c++) {
if (GradU[c] >= 10) { GradU[c] = 10; }
if (GradU[c] <= -10) { GradU[c] = -10; }
IAssert(GradU[c] >= -10);
}
}
namespace polygon_merger {
int polygonCount;
typedef std::set<int> TIntSet;
TIntSet vertices;
TIntSet borderVertices;
typedef std::map< int, TIntVector > TIntIntsMap;
TIntIntsMap vertexNexts;
TIntIntsMap vertexPrevs;
TIntVector vertexUseCount;
TIntVector vertexTraceID;
enum eVertexType {
VTYPE_NONE, ///< Not computed yet
VTYPE_INTERIOR, ///< Completely interior
VTYPE_SINGLE, ///< On the border, belongs to single polygon
VTYPE_MULTI, ///< On the border, belongs to multiple polygons
VTYPE_DONE, ///< Already fully processed (traced into result polygon)
};
TIntVector vertexTypes;
bool isVertexInterior( int idx )
{
assert( idx >= 0 && idx < vertexUseCount.size() );
// vertex is interior if it's use count is >1, AND
// it's all neighbors' use counts are >1, AND it has exactly "usecount"
// different neighbors.
int useCount = vertexUseCount[idx];
assert( useCount >= 1 );
if( useCount < 2 )
return false;
TIntIntsMap::const_iterator it;
int i, n;
it = vertexNexts.find( idx );
assert( it != vertexNexts.end() );
const TIntVector& vnext = it->second;
n = vnext.size();
assert( n == useCount );
for( i = 0; i < n; ++i ) {
if( vertexUseCount[vnext[i]] < 2 )
return false;
}
it = vertexPrevs.find( idx );
assert( it != vertexPrevs.end() );
const TIntVector& vprev = it->second;
n = vprev.size();
assert( n == useCount );
for( i = 0; i < n; ++i ) {
int nidx = vprev[i];
if( vertexUseCount[nidx] < 2 )
return false;
if( std::find( vnext.begin(), vnext.end(), nidx ) == vnext.end() )
return false;
}
return true; // fall through: must be interior
}
void markVertexTypes()
{
TIntSet::const_iterator vit, vitEnd = vertices.end();
// first pass: mark all interior and single-border vertices
for( vit = vertices.begin(); vit != vitEnd; ++vit ) {
int idx = *vit;
if( vertexUseCount[idx] == 1 ) {
vertexTypes[idx] = VTYPE_SINGLE;
borderVertices.insert( idx );
} else if( isVertexInterior(idx) )
vertexTypes[idx] = VTYPE_INTERIOR;
}
// now, the unmarked vertices are all shared and on border
for( vit = vertices.begin(); vit != vitEnd; ++vit ) {
int idx = *vit;
if( vertexTypes[idx] == VTYPE_NONE ) {
vertexTypes[idx] = VTYPE_MULTI;
borderVertices.insert( idx );
}
}
}
int getBorderIndex()
{
if( borderVertices.empty() )
return -1;
return *borderVertices.begin();
}
void traceBorder( const TWallVertexVector& vb, TIntVector& polygon, TIntVector& ib )
{
static int traceID = 0;
++traceID;
int idx0 = getBorderIndex();
assert( idx0 >= 0 && idx0 < vertexTypes.size() );
ib.resize( 0 );
polygon.resize( 0 );
polygon.reserve( vertices.size()/2 );
TIntVector localPolygon;
localPolygon.reserve( 128 );
TIntVector localIB;
localIB.reserve( 128 );
int idxPrev = idx0;
int idx = idx0;
int debugCounter = 0;
int debugLoopCounter = 0;
do {
localIB.resize( 0 );
bool willFormLoop;
do{
localPolygon.push_back( idx );
borderVertices.erase( idx );
vertexTraceID[idx] = traceID;
assert( ++debugCounter <= vertices.size()*2 );
// Next vertex is the neighbor of current, that is not interior
// and that is not the previous one.
// When there are many possible ones, trace based on angle.
int idxNext = -1;
SVector2 prevToCurr = vb[idx] - vb[idxPrev];
if( prevToCurr.lengthSq() < 1.0e-6f )
prevToCurr.set( -0.01f, -0.01f );
TIntIntsMap::const_iterator it;
it = vertexNexts.find( idx );
assert( it != vertexNexts.end() );
const TIntVector& vnext = it->second;
int n = vnext.size();
float bestAngle = 100.0f;
for( int i = 0; i < n; ++i ) {
int idx1 = vnext[i];
if( idx1 != idxPrev && vertexTypes[idx1] != VTYPE_INTERIOR ) {
//if( idx1 != idxPrev ) {
SVector2 currToNext = vb[idx1] - vb[idx];
float ang = signedAngle2D( prevToCurr, currToNext );
if( ang < bestAngle ) {
bestAngle = ang;
idxNext = idx1;
}
}
}
assert( bestAngle > -4.0f && bestAngle < 4.0f );
assert( idxNext >= 0 );
willFormLoop = (vertexTraceID[idxNext] == traceID);
// Optimization: if best angle is zero, then we're walking
// in a straight line. Optimize out the current vertex.
if( bestAngle == 0.0f && idx != idx0 && !willFormLoop ) {
localPolygon.pop_back();
}
idxPrev = idx;
idx = idxNext;
} while( !willFormLoop );
assert( localPolygon.size() >= 3 );
//if( localPolygon.size() < 3 ) {
// return;
//}
assert( ++debugLoopCounter < vertices.size() );
if( idx == idx0 ) {
// The polygon is simple or we found the last loop.
// Triangulate local and append to results.
triangulator::process( vb, localPolygon, localIB );
polygon.insert( polygon.end(), localPolygon.begin(), localPolygon.end() );
ib.insert( ib.end(), localIB.begin(), localIB.end() );
// We can have separated other loops. Try fetching them as well.
idx0 = getBorderIndex();
if( idx0 == -1 ) {
return;
} else {
localPolygon.resize( 0 );
idxPrev = idx0;
idx = idx0;
}
} else {
// The polygon must be complex, and we just found a closed loop.
// Take only the loop, triangulate it, append to results, continue.
TIntVector::const_iterator itLoopStart =
std::find( localPolygon.begin(), localPolygon.end(), idx );
assert( itLoopStart != localPolygon.end() );
// append to results
TIntVector loopPolygon( itLoopStart, localPolygon.end() );
triangulator::process( vb, loopPolygon, localIB );
polygon.insert( polygon.end(), loopPolygon.begin(), loopPolygon.end() );
ib.insert( ib.end(), localIB.begin(), localIB.end() );
// continue - remove the looped polygon from local
localPolygon.resize( itLoopStart - localPolygon.begin() );
}
} while( true );
}
void begin( int totalVerts )
{
polygonCount = 0;
vertices.clear();
borderVertices.clear();
vertexNexts.clear();
vertexPrevs.clear();
vertexUseCount.resize( 0 );
vertexUseCount.resize( totalVerts, 0 );
vertexTraceID.resize( totalVerts, -1 );
vertexTypes.resize( 0 );
vertexTypes.resize( totalVerts, VTYPE_NONE );
}
void addPolygon( const TIntVector& ib )
{
++polygonCount;
TIntVector::const_iterator vit, vitEnd = ib.end();
for( vit = ib.begin(); vit != vitEnd; ++vit ) {
int idx = *vit;
assert( idx >= 0 && idx < vertexUseCount.size() );
vertices.insert( idx );
++vertexUseCount[idx];
int idxNext = (vit==vitEnd-1) ? ib.front() : *(vit+1);
int idxPrev = (vit==ib.begin()) ? ib.back() : *(vit-1);
vertexNexts[idx].push_back( idxNext );
vertexPrevs[idx].push_back( idxPrev );
}
}
void end( const TWallVertexVector& vb, TIntVector& polygon, TIntVector& ib )
{
assert( polygonCount );
if( polygonCount == 1 ) {
// trivial case, just output input polygon
polygon.resize( 0 );
polygon.reserve( vertices.size() );
int idx0 = *vertices.begin();
int idx = idx0;
do {
polygon.push_back( idx );
const TIntVector& vnext = vertexNexts[idx];
assert( vnext.size() == 1 );
idx = vnext[0];
} while( idx != idx0 );
triangulator::process( vb, polygon, ib );
} else {
// mark vertex types
markVertexTypes();
// trace and triangulate the polygon(s)
traceBorder( vb, polygon, ib );
}
}
}; // namespace polygon_merger