// Save and load directed, undirected and multi-graphs as list of edges, where nodes are ids
void SaveLoadEdgeList() {
const int NNodes = 500;
const int NEdges = 2000;
const char *FName = "demo.graph.dat";
const char *Desc = "Randomly generated graph for input/output.";
PNGraph GOut, GIn;
GOut = GenRndGnm<PNGraph>(NNodes, NEdges);
// Output node IDs as numbers
SaveEdgeList(GOut, FName, Desc);
// Load edge list
GIn = LoadEdgeList<PNGraph>(FName);
// Verify all nodes exist in input and output graphs
THashSet<TInt> OutNIdH, InNIdH;
for (TNGraph::TNodeI NI = GOut->BegNI(); NI < GOut->EndNI(); NI++) {
// Nodes that do not have edges are left off during input
if (NI.GetDeg() > 0) {
OutNIdH.AddKey(NI.GetId());
}
}
for (TNGraph::TNodeI NI = GIn->BegNI(); NI < GIn->EndNI(); NI++) {
InNIdH.AddKey(NI.GetId());
}
PrintGStats<PNGraph>("EdgeList - Out", GOut);
PrintGStats<PNGraph>("EdgeList - In", GIn);
}
// Saves and loads a graph in a MATLAB sparse matrix format
void IOMatlabSparseMtx() {
const int NNodes = 500;
const int NEdges = 2000;
const char *FName = "demo.matlab.dat";
PNGraph GOut, GIn;
GOut = GenRndGnm<PNGraph>(NNodes, NEdges);
SaveMatlabSparseMtx(GOut, FName);
GIn = TNGraph::New();
GIn->Reserve(NNodes, NEdges);
// Read-in Matlab-file
FILE *F = fopen(FName, "r");
while (! feof(F)) {
int Src, Dst, Edge;
fscanf(F, "%d %d %d\n", &Src, &Dst, &Edge);
Src--; Dst--; // SNAP graphs start at Node Ids of 0
if (not GIn->IsNode(Src)) {
GIn->AddNode(Src);
}
if (not GIn->IsNode(Dst)) {
GIn->AddNode(Dst);
}
GIn->AddEdge(Src, Dst);
}
fclose(F);
// Verify all nodes exist in input and output graphs (and no more)
THashSet<TInt> OutNIdH, InNIdH;
for (TNGraph::TNodeI NI = GOut->BegNI(); NI < GOut->EndNI(); NI++) {
// Nodes that do not have edges are left off during input
if (NI.GetDeg() > 0) {
OutNIdH.AddKey(NI.GetId());
}
}
for (TNGraph::TNodeI NI = GIn->BegNI(); NI < GIn->EndNI(); NI++) {
InNIdH.AddKey(NI.GetId());
}
PrintGStats("Matlab - Out", GOut);
PrintGStats("Matlab - In", GIn);
}
// Rok #13
//template<class PGraph>
int64 CountTriangles1(const TVec<TNGraph::TNodeI,int>& NV, const TIntV& IndV, const TIntV& MapV) {
struct timeval start, end;
float delta;
TTmProfiler Profiler;
int TimerId = Profiler.AddTimer("Profiler");
int ind = MapV.Len();
Profiler.ResetTimer(TimerId);
Profiler.StartTimer(TimerId);
gettimeofday(&start, NULL);
TVec<TIntV> HigherDegNbrV(ind);
for (int i = 0; i < ind; i++) {
HigherDegNbrV[i] = TVec<TInt>();
HigherDegNbrV[i].Reserve(NV[i].GetDeg());
HigherDegNbrV[i].Reduce(0);
}
gettimeofday(&end, NULL);
Profiler.StopTimer(TimerId);
delta = ((end.tv_sec - start.tv_sec) * 1000000u +
end.tv_usec - start.tv_usec) / 1.e6;
printf("__valloc__\ttime %7.3f\tcpu %8.3f\n", delta, Profiler.GetTimerSec(TimerId));
Profiler.ResetTimer(TimerId);
Profiler.StartTimer(TimerId);
gettimeofday(&start, NULL);
#pragma omp parallel for schedule(dynamic)
for (TInt i = 0; i < ind; i++) {
TNGraph::TNodeI NI = NV[i];
//HigherDegNbrV[i] = TVec<TInt>();
//HigherDegNbrV[i].Reserve(NI.GetDeg());
//HigherDegNbrV[i].Reduce(0);
GetMergeSortedV(HigherDegNbrV[i], NI);
int k = 0;
for (TInt j = 0; j < HigherDegNbrV[i].Len(); j++) {
TInt Vert = HigherDegNbrV[i][j];
TInt Deg = NV[IndV[Vert]].GetDeg();
if (Deg > NI.GetDeg() ||
(Deg == NI.GetDeg() && Vert > NI.GetId())) {
HigherDegNbrV[i][k] = Vert;
k++;
}
}
HigherDegNbrV[i].Reduce(k);
}
gettimeofday(&end, NULL);
Profiler.StopTimer(TimerId);
delta = ((end.tv_sec - start.tv_sec) * 1000000u +
end.tv_usec - start.tv_usec) / 1.e6;
printf("__sort__\ttime %7.3f\tcpu %8.3f\n", delta, Profiler.GetTimerSec(TimerId));
Profiler.ResetTimer(TimerId);
Profiler.StartTimer(TimerId);
gettimeofday(&start, NULL);
int64 cnt = 0;
#pragma omp parallel for schedule(dynamic) reduction(+:cnt)
for (TInt i = 0; i < HigherDegNbrV.Len(); i++) {
for (TInt j = 0; j < HigherDegNbrV[i].Len(); j++) {
//TInt NbrInd = H.GetDat(HigherDegNbrV[i][j]);
TInt NbrInd = IndV[HigherDegNbrV[i][j]];
int64 num = GetCommon(HigherDegNbrV[i], HigherDegNbrV[NbrInd]);
cnt += num;
}
}
gettimeofday(&end, NULL);
Profiler.StopTimer(TimerId);
delta = ((end.tv_sec - start.tv_sec) * 1000000u +
end.tv_usec - start.tv_usec) / 1.e6;
printf("__count__\ttime %7.3f\tcpu %8.3f\n", delta, Profiler.GetTimerSec(TimerId));
return cnt;
}
int64 CountTriangles2(const PNGraph &Graph) {
struct timeval start, end;
float delta;
TTmProfiler Profiler;
int TimerId = Profiler.AddTimer("Profiler");
const int NNodes = Graph->GetNodes();
TIntV MapV(NNodes);
TVec<TNGraph::TNodeI> NV(NNodes);
NV.Reduce(0);
Profiler.ResetTimer(TimerId);
Profiler.StartTimer(TimerId);
gettimeofday(&start, NULL);
int MxId = -1;
int ind = 0;
for (TNGraph::TNodeI NI = Graph->BegNI(); NI < Graph->EndNI(); NI++) {
NV.Add(NI);
int Id = NI.GetId();
if (Id > MxId) {
MxId = Id;
}
MapV[ind] = Id;
ind++;
}
TIntV IndV(MxId+1);
for (int j = 0; j < NNodes; j++) {
IndV[MapV[j]] = j;
}
gettimeofday(&end, NULL);
Profiler.StopTimer(TimerId);
delta = ((end.tv_sec - start.tv_sec) * 1000000u +
end.tv_usec - start.tv_usec) / 1.e6;
printf("__nodemap__\ttime %7.3f\tcpu %8.3f\n", delta, Profiler.GetTimerSec(TimerId));
Profiler.ResetTimer(TimerId);
Profiler.StartTimer(TimerId);
gettimeofday(&start, NULL);
ind = MapV.Len();
Profiler.ResetTimer(TimerId);
Profiler.StartTimer(TimerId);
gettimeofday(&start, NULL);
TVec<TIntV> HigherDegNbrV(ind);
for (int i = 0; i < ind; i++) {
HigherDegNbrV[i] = TVec<TInt>();
HigherDegNbrV[i].Reserve(NV[i].GetDeg());
HigherDegNbrV[i].Reduce(0);
}
gettimeofday(&end, NULL);
Profiler.StopTimer(TimerId);
delta = ((end.tv_sec - start.tv_sec) * 1000000u +
end.tv_usec - start.tv_usec) / 1.e6;
printf("__valloc__\ttime %7.3f\tcpu %8.3f\n", delta, Profiler.GetTimerSec(TimerId));
Profiler.ResetTimer(TimerId);
Profiler.StartTimer(TimerId);
gettimeofday(&start, NULL);
#pragma omp parallel for schedule(dynamic)
for (TInt i = 0; i < ind; i++) {
TNGraph::TNodeI NI = NV[i];
//HigherDegNbrV[i] = TVec<TInt>();
//HigherDegNbrV[i].Reserve(NI.GetDeg());
//HigherDegNbrV[i].Reduce(0);
GetMergeSortedV(HigherDegNbrV[i], NI);
int k = 0;
for (TInt j = 0; j < HigherDegNbrV[i].Len(); j++) {
TInt Vert = HigherDegNbrV[i][j];
TInt Deg = NV[IndV[Vert]].GetDeg();
if (Deg > NI.GetDeg() ||
(Deg == NI.GetDeg() && Vert > NI.GetId())) {
HigherDegNbrV[i][k] = Vert;
k++;
}
}
HigherDegNbrV[i].Reduce(k);
}
gettimeofday(&end, NULL);
Profiler.StopTimer(TimerId);
delta = ((end.tv_sec - start.tv_sec) * 1000000u +
end.tv_usec - start.tv_usec) / 1.e6;
printf("__sort__\ttime %7.3f\tcpu %8.3f\n", delta, Profiler.GetTimerSec(TimerId));
Profiler.ResetTimer(TimerId);
Profiler.StartTimer(TimerId);
gettimeofday(&start, NULL);
int64 cnt = 0;
#pragma omp parallel for schedule(dynamic) reduction(+:cnt)
for (TInt i = 0; i < HigherDegNbrV.Len(); i++) {
for (TInt j = 0; j < HigherDegNbrV[i].Len(); j++) {
//TInt NbrInd = H.GetDat(HigherDegNbrV[i][j]);
TInt NbrInd = IndV[HigherDegNbrV[i][j]];
int64 num = GetCommon(HigherDegNbrV[i], HigherDegNbrV[NbrInd]);
cnt += num;
}
}
gettimeofday(&end, NULL);
Profiler.StopTimer(TimerId);
delta = ((end.tv_sec - start.tv_sec) * 1000000u +
end.tv_usec - start.tv_usec) / 1.e6;
printf("__count__\ttime %7.3f\tcpu %8.3f\n", delta, Profiler.GetTimerSec(TimerId));
return cnt;
}
// Test node, edge creation
TEST(TNGraph, ManipulateNodesEdges) {
int NNodes = 10000;
int NEdges = 100000;
const char *FName = "test.graph.dat";
PNGraph Graph;
PNGraph Graph1;
PNGraph Graph2;
int i;
int n;
int NCount;
int x,y;
int Deg, InDeg, OutDeg;
Graph = TNGraph::New();
EXPECT_EQ(1,Graph->Empty());
// create the nodes
for (i = 0; i < NNodes; i++) {
Graph->AddNode(i);
}
EXPECT_EQ(0,Graph->Empty());
EXPECT_EQ(NNodes,Graph->GetNodes());
// create random edges
NCount = NEdges;
while (NCount > 0) {
x = (long) (drand48() * NNodes);
y = (long) (drand48() * NNodes);
// Graph->GetEdges() is not correct for the loops (x == y),
// skip the loops in this test
if (x != y && !Graph->IsEdge(x,y)) {
n = Graph->AddEdge(x, y);
NCount--;
}
}
EXPECT_EQ(NEdges,Graph->GetEdges());
EXPECT_EQ(0,Graph->Empty());
EXPECT_EQ(1,Graph->IsOk());
for (i = 0; i < NNodes; i++) {
EXPECT_EQ(1,Graph->IsNode(i));
}
EXPECT_EQ(0,Graph->IsNode(NNodes));
EXPECT_EQ(0,Graph->IsNode(NNodes+1));
EXPECT_EQ(0,Graph->IsNode(2*NNodes));
// nodes iterator
NCount = 0;
for (TNGraph::TNodeI NI = Graph->BegNI(); NI < Graph->EndNI(); NI++) {
NCount++;
}
EXPECT_EQ(NNodes,NCount);
// edges per node iterator
NCount = 0;
for (TNGraph::TNodeI NI = Graph->BegNI(); NI < Graph->EndNI(); NI++) {
for (int e = 0; e < NI.GetOutDeg(); e++) {
NCount++;
}
}
EXPECT_EQ(NEdges,NCount);
// edges iterator
NCount = 0;
for (TNGraph::TEdgeI EI = Graph->BegEI(); EI < Graph->EndEI(); EI++) {
NCount++;
}
EXPECT_EQ(NEdges,NCount);
// node degree
for (TNGraph::TNodeI NI = Graph->BegNI(); NI < Graph->EndNI(); NI++) {
Deg = NI.GetDeg();
InDeg = NI.GetInDeg();
OutDeg = NI.GetOutDeg();
EXPECT_EQ(Deg,InDeg+OutDeg);
}
// assignment
Graph1 = TNGraph::New();
*Graph1 = *Graph;
EXPECT_EQ(NNodes,Graph1->GetNodes());
EXPECT_EQ(NEdges,Graph1->GetEdges());
EXPECT_EQ(0,Graph1->Empty());
EXPECT_EQ(1,Graph1->IsOk());
// saving and loading
{
TFOut FOut(FName);
Graph->Save(FOut);
FOut.Flush();
}
{
TFIn FIn(FName);
Graph2 = TNGraph::Load(FIn);
}
EXPECT_EQ(NNodes,Graph2->GetNodes());
EXPECT_EQ(NEdges,Graph2->GetEdges());
EXPECT_EQ(0,Graph2->Empty());
EXPECT_EQ(1,Graph2->IsOk());
// remove all the nodes and edges
for (i = 0; i < NNodes; i++) {
n = Graph->GetRndNId();
Graph->DelNode(n);
}
EXPECT_EQ(0,Graph->GetNodes());
EXPECT_EQ(0,Graph->GetEdges());
EXPECT_EQ(1,Graph->IsOk());
EXPECT_EQ(1,Graph->Empty());
Graph1->Clr();
EXPECT_EQ(0,Graph1->GetNodes());
EXPECT_EQ(0,Graph1->GetEdges());
EXPECT_EQ(1,Graph1->IsOk());
EXPECT_EQ(1,Graph1->Empty());
}
