/** Create a set of candidate branching objects. */
int
MibSBranchStrategyMaxInf::createCandBranchObjects(int numPassesLeft, double ub)
{
int numInfs = 0;
int i, col, preferDir, maxInfDir, maxScoreDir;
double score, maxScore = 0.0;
double infeasibility, maxInf = 0.0;
BlisModel *model = dynamic_cast<BlisModel *>(model_);
BlisObjectInt * intObject = 0;
BlisObjectInt * maxInfIntObject = 0;
BlisObjectInt * maxScoreIntObject = 0;
//MibSObjectInt * intObject = 0;
//MibSObjectInt * maxInfIntObject = 0;
//MibSObjectInt * maxScoreIntObject = 0;
int numObjects = model->numObjects();
double *objCoef = model->getObjCoef();
MibSModel *mibsmodel = dynamic_cast<MibSModel *>(model);
bool bilevelBranch = mibsmodel->bS_->useBilevelBranching_;
if(bilevelBranch){
//create branch based on bilevel infeasibility
std::cout << "Using Bilevel Branching." << std::endl;
}
else{
//use Blis MaxInf branching
for (i = 0; i < numObjects; ++i) {
// TODO: currently all integer object.
intObject = dynamic_cast<BlisObjectInt *>(model->objects(i));
//intObject = dynamic_cast<MibSObjectInt *>(model->objects(i));
infeasibility = intObject->infeasibility(model, preferDir);
if (infeasibility) {
++numInfs;
if (infeasibility > maxInf) {
maxInfIntObject = intObject;
maxInfDir = preferDir;
maxInf = infeasibility;
}
col = intObject->columnIndex();
score = ALPS_FABS(objCoef[col] * infeasibility);
if (score > maxScore) {
maxScoreIntObject = intObject;
maxScoreDir = preferDir;
maxScore = score;
}
}
}
assert(numInfs > 0);
if (maxScoreIntObject) {
maxInfIntObject = maxScoreIntObject;
maxInfDir = maxScoreDir;
}
}
numBranchObjects_ = 1;
//FIXME: THINK I NEED TO DERIVE MY OWN BRANCHING OBJECT CLASS
branchObjects_ = new BcpsBranchObject* [1];
branchObjects_[0] = maxInfIntObject->createBranchObject(model,
maxInfDir);
return 0;
}
/** Create a set of candidate branching objects. */
int
BlisBranchStrategyMaxInf::createCandBranchObjects(int numPassesLeft,
double ub)
{
int numInfs = 0;
int i, col, preferDir, maxInfDir = 0, maxScoreDir = 0;
double score, maxScore = 0.0;
double infeasibility, maxInf = 0.0;
BlisModel *model = dynamic_cast<BlisModel *>(model_);
BlisObjectInt * intObject = 0;
BlisObjectInt * maxInfIntObject = 0;
BlisObjectInt * maxScoreIntObject = 0;
int numObjects = model->numObjects();
double *objCoef = model->getObjCoef();
for (i = 0; i < numObjects; ++i) {
// TODO: currently all integer object.
intObject = dynamic_cast<BlisObjectInt *>(model->objects(i));
infeasibility = intObject->infeasibility(model, preferDir);
if (infeasibility) {
++numInfs;
if (infeasibility > maxInf) {
maxInfIntObject = intObject;
maxInfDir = preferDir;
maxInf = infeasibility;
}
col = intObject->columnIndex();
score = ALPS_FABS(objCoef[col] * infeasibility);
if (score > maxScore) {
maxScoreIntObject = intObject;
maxScoreDir = preferDir;
maxScore = score;
}
}
}
assert(numInfs > 0);
if (maxScoreIntObject) {
maxInfIntObject = maxInfIntObject;
maxInfDir = maxScoreDir;
}
numBranchObjects_ = 1;
branchObjects_ = new BcpsBranchObject* [1];
branchObjects_[0] = maxInfIntObject->createBranchObject(model,
maxInfDir);
return 0;
}
