bool ParallelMcmcmc::restore(void){
if(stream.is_open())
stream.close();
stream.open((filename+".stream").c_str(), std::fstream::in);
size_t pos = stream.tellg();
size_t lastsample = pos;
while(!stream.eof()){
fromStream(stream,false);
lastsample = pos;
pos = stream.tellg();
}
if(numSteppingStones > 0)
{
int index = 0;
for ( size_t i = 0; i < numSteppingStones; i++)
{
stream.clear();
stream.seekg(lastsample);
stream >> currentGeneration;
if(numChains > 1){
stream >> index;
}
chains[i]->fromStream(stream);
chains[i]->setChainActive(i == 0);
chains[i]->setChainHeat(computeBeta(delta,sigma,i));
chainIdxByHeat[i] = i;
}
bool Optimize::eval_f(Ipopt::Index n, const Ipopt::Number *x, bool new_x, Ipopt::Number &obj_value)
{
UNUSED(n);
UNUSED(new_x);
if (updateCross(x) == false) return false;
obj_value = 0;
PointArray px = PointArray(x);
Ipopt::Number t[3];
Ipopt::Number r = 0;
double tmp;
int i = 0, size = EnergyVertices.size();
for (; i < size; i++)
{
obj_value += computeBeta(i, x) / VerticesWeight[i];
}
obj_value *= 2 * pOp->BendingEnergyCoef;
i = 0;
size = PositionConstraints.size();
for (; i < size; i++)
{
sub(px(PositionConstraints[i]), positions[i].data(), t);
r += sqrnorm(t);
}
r *= pOp->PositionConstraintsWeight;
obj_value += r;
r = 0;
i = 0;
size = TangentConstraints.size();
for (; i < size; ++i)
{
computeTangentEdge(i, x, t);
r += 1 - dot(t, tangents[i].data());
}
obj_value += r * pOp->TangentConstraintsCoef;
r = 0;
i = 0;
size = PlaneConstraints.size();
for (; i < size; ++i)
{
tmp = (getPoint(PlaneConstraints[i], x) | PlaneConstraintsInfo[i].first) + PlaneConstraintsInfo[i].second;
r += tmp * tmp;
}
obj_value += r * pOp->PlaneConstraintsCoef;
return true;
}
GrabCut::GrabCut( Image<Color>* image )
{
m_image = image;
m_w = m_image->width();
m_h = m_image->height();
m_trimap = new Image<TrimapValue>( m_w, m_h );
m_trimap->fill(TrimapUnknown);
m_GMMcomponent = new Image<unsigned int>( m_w, m_h );
m_hardSegmentation = new Image<SegmentationValue>( m_w, m_h );
m_hardSegmentation->fill(SegmentationBackground);
m_softSegmentation = 0; // Not yet implemented
m_TLinksImage = new Image<Color>(m_w, m_h);
m_TLinksImage->fill(Color(0,0,0));
m_NLinksImage = new Image<Real>(m_w, m_h);
m_NLinksImage->fill(0);
m_GMMImage = new Image<Color>(m_w, m_h);
m_GMMImage->fill(Color(0,0,0));
m_AlphaImage = new Image<Real>(m_w, m_h);
m_AlphaImage->fill(0);
m_foregroundGMM = new GMM(5);
m_backgroundGMM = new GMM(5);
//set some constants
m_lambda = 50;
computeL();
computeBeta();
m_NLinks = new Image<NLinks>( m_w, m_h );
computeNLinks();
m_graph = 0;
m_nodes = new Image<Graph::node_id>( m_w, m_h );
}
Vertices<CoordType> SpatialModelMaximalRepulsion3D<CoordType>::drawSample(const int numPoints)
{
ENTER("Vertices<CoordType> SpatialModelMaximalRepulsion3D<CoordType>::drawSample(const int)");
const int outerSteps = getNumMonteCarloCycles();
const int innerSteps = numPoints;
const CoordType beta = computeBeta();
const CoordType maxRadius = this->getTriMesh().equivalentRadius() / 50.0;
Vertices<CoordType> vertices = SpatialModelHardcoreDistance3D<CoordType>::drawSample( numPoints );
RandomGenerator& randomGenerator = this->getRandomGenerator();
CoordType currentEnergy, newEnergy, deltaEnergy;
Vector<CoordType> vertex;
bool acceptTransition;
int i, j, v;
ConvergenceTest<CoordType> convergenceTest;
CoordType sumEnergy;
bool converged = false;
_energyProfile.setZeros( outerSteps );
convergenceTest.setData( _energyProfile );
convergenceTest.setRange( 100 );
for (i = 0; !converged && i < outerSteps; ++i)
{
#if 0
if ( (i%20)==0 )
{
string filename = "max-repulsion-vertices-" + StringTools::toString(i,4,'0') + ".vx";
vertices.save( filename, true );
}
#endif
for (j = 0, sumEnergy = 0.0; j < innerSteps; ++j)
{
v = randomGenerator.uniformL( numPoints );
vertex = vertices[v];
if ( j == 0 ) currentEnergy = energy( vertices );
moveVertex( vertices, v, maxRadius );
newEnergy = energy( vertices );
deltaEnergy = newEnergy - currentEnergy;
acceptTransition = deltaEnergy <= .0 || randomGenerator.uniformLF() < exp( -beta*deltaEnergy );
if ( acceptTransition )
currentEnergy = newEnergy;
else vertices[v] = vertex;
sumEnergy += currentEnergy;
}
_energyProfile[i] = sumEnergy / innerSteps;
converged = convergenceTest.isPositive( i );
}
if ( !converged )
{
Exception exception;
exception.setWhere( "Vertices<CoordType> SpatialModelMaximalRepulsion3D<CoordType>::drawSample(const int)" );
exception.setWhat( "Convergence not reached after " + StringTools::toString(outerSteps) + " iterations" );
throw exception;
}
LEAVE();
return vertices;
}
ParallelMcmcmc::ParallelMcmcmc(Model* m, const std::vector<Move*> &moves, const std::vector<Monitor*> &mons, std::string fn, std::string sT, int ev, int nc, int np, int si, double dt, double st, double sh, bool saveall, size_t ss) : Cloneable( ),
filename(fn),
numChains(nc),
numProcesses(np),
scheduleType(sT),
every(ev),
currentGeneration(0),
swapInterval(si),
delta(dt),
sigma(st),
startingHeat(sh),
saveall(saveall),
numSteppingStones(ss)
{
activeIndex = 0;
std::vector<Monitor*> mons2 = mons;
if(numSteppingStones > 0)
mons2.clear();
size_t numMcmc = std::max(numSteppingStones,numChains);
for (size_t i = 0; i < numMcmc; i++)
{
// get chain heat
double b = computeBeta(delta,sigma,i) * startingHeat;
// create chains
bool a = (i == 0 ? true : false);
Mcmc* oneChain = new Mcmc(m, moves, mons2, scheduleType, a, b, i);
oneChain->setChainIndex(i);
oneChain->startMonitors();
// add chain to team
chains.push_back(oneChain);
chainIdxByHeat.push_back(i);
}
numNodes = chains[0]->getNumNodes();
//std::cout << "\n";
steppingStones = std::vector<std::vector<double> >(numSteppingStones, std::vector<double>());
numMcmc = numSteppingStones > 0 ? numSteppingStones : numChains;
if (numMcmc < numProcesses)
numProcesses = numMcmc;
// assign chains to processors
#if defined (USE_LIB_OPENMP)
omp_set_num_threads((unsigned)numProcesses);
#endif
chainsPerProcess.resize(numProcesses);
for (size_t i = 0, j = 0; i < numMcmc; i++, j++)
{
if (j >= numProcesses)
j = 0;
chainsPerProcess[j].push_back(i);
}
}