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on-restart-benchmarks/software/minizinc/solvers/MIP/MIP_gurobi_wrap.cpp

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// * -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Gleb Belov <gleb.belov@monash.edu>
*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifdef _MSC_VER
#define _CRT_SECURE_NO_WARNINGS
#endif
#include <minizinc/config.hh>
#include <minizinc/exception.hh>
#include <minizinc/file_utils.hh>
#include <minizinc/utils_savestream.hh>
#include <cmath>
#include <cstring>
#include <ctime>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <sstream>
#include <stdexcept>
#include <string>
#ifdef GUROBI_PLUGIN
#ifdef HAS_DLFCN_H
#include <dlfcn.h>
#elif defined HAS_WINDOWS_H
#define NOMINMAX // Ensure the words min/max remain available
#include <Windows.h>
#undef ERROR
#endif
#endif
#include <minizinc/solvers/MIP/MIP_gurobi_wrap.hh>
#include <minizinc/utils.hh>
using namespace std;
string MIPGurobiWrapper::getDescription(FactoryOptions& factoryOpt,
MiniZinc::SolverInstanceBase::Options* opt) {
ostringstream oss;
oss << "MIP wrapper for Gurobi library " << getVersion(factoryOpt, nullptr);
oss << ". Compiled " __DATE__ " " __TIME__;
return oss.str();
}
string MIPGurobiWrapper::getVersion(FactoryOptions& factoryOpt,
MiniZinc::SolverInstanceBase::Options* opt) {
ostringstream oss;
MIPGurobiWrapper mgw(factoryOpt, nullptr); // to avoid opening the env
try {
mgw.checkDLL();
int major;
int minor;
int technical;
mgw.dll_GRBversion(&major, &minor, &technical);
oss << major << '.' << minor << '.' << technical;
return oss.str();
} catch (MiniZinc::InternalError&) {
return "<unknown version>";
}
}
vector<string> MIPGurobiWrapper::getRequiredFlags(FactoryOptions& f) {
FactoryOptions factoryOpt;
MIPGurobiWrapper mgw(factoryOpt, nullptr);
try {
mgw.checkDLL();
return {};
} catch (MiniZinc::InternalError&) {
return {"--gurobi-dll"};
}
}
vector<string> MIPGurobiWrapper::getFactoryFlags() { return {"--gurobi-dll"}; }
string MIPGurobiWrapper::getId() { return "gurobi"; }
string MIPGurobiWrapper::getName() { return "Gurobi"; }
vector<string> MIPGurobiWrapper::getTags() { return {"mip", "float", "api"}; }
vector<string> MIPGurobiWrapper::getStdFlags() { return {"-i", "-p", "-s", "-v"}; }
vector<string> gurobi_dlls() {
const vector<string> versions = {
"913", "912", "911", "910", "904", // Potential future versions which should load correctly
"903", "902", "901", "900", "811", "810", "801", "800", "752",
"751", "750", "702", "701", "700", "652", "651", "650"};
vector<string> dlls;
string lastMajorVersion;
for (const auto& version : versions) {
string majorVersion = version.substr(0, 2);
if (majorVersion != lastMajorVersion) {
dlls.push_back("gurobi" + majorVersion);
lastMajorVersion = majorVersion;
}
#ifdef _WIN32
dlls.push_back("C:\\gurobi" + version + "\\win64\\bin\\gurobi" + majorVersion + ".dll");
#elif __APPLE__
dlls.push_back("/Library/gurobi" + version + "/mac64/lib/libgurobi" + majorVersion + ".dylib");
#else
dlls.push_back("/opt/gurobi" + version + "/linux64/lib/libgurobi" + majorVersion + ".so");
#endif
}
return dlls;
}
void MIPGurobiWrapper::Options::printHelp(ostream& os) {
os << "GUROBI MIP wrapper options:"
<< std::endl
// -s print statistics
// << " --readParam <file> read GUROBI parameters from file
// << "--writeParam <file> write GUROBI parameters to file
// << "--tuneParam instruct GUROBI to tune parameters instead of solving
<< " -f\n free search (default)" << std::endl
<< " --fixed-search\n fixed search (approximation of the model's one by branching "
"priorities)"
<< std::endl
<< " --uniform-search\n 'more fixed' search (all variables in the search anns get "
"priority 1)"
<< std::endl
<< " --mipfocus <n>\n 1: feasibility, 2: optimality, 3: move bound (default is 0, "
"balanced)"
<< std::endl
<< " -i\n print intermediate solutions for optimization problems" << std::endl
<< " -p <N>, --parallel <N>\n use N threads, default: 1."
<< std::endl
// << " --nomippresolve disable MIP presolving NOT IMPL" << std::endl
<< " --solver-time-limit <N>, --solver-time\n"
" stop search after N milliseconds wall time"
<< std::endl
<< " --solver-time-limit-feas <N>, --solver-tlf\n"
" stop search after N milliseconds wall time after the first feasible solution"
<< std::endl
<< " -n <N>, --num-solutions <N>\n"
" stop search after N solutions"
<< std::endl
<< " -r <N>, --random-seed <N>\n"
" random seed, integer"
<< std::endl
<< " --workmem <N>, --nodefilestart <N>\n"
" maximal RAM for node tree used before writing to node file, GB, default: 0.5"
<< std::endl
<< " --nodefiledir <path>\n"
" nodefile directory"
<< std::endl
<< " --writeModel <file>\n write model to <file> (.lp, .mps, .sav, ...)" << std::endl
<< " --readParam <file>\n read GUROBI parameters from file" << std::endl
<< " --writeParam <file>\n write GUROBI parameters to file" << std::endl
<< " --readConcurrentParam <fileN>\n"
" read GUROBI parameters from file. Several such commands provide the"
" parameter files for concurrent solves (applied after all other settings)"
<< std::endl
// << " --tuneParam instruct GUROBI to tune parameters instead of solving NOT
// IMPL"
<< "\n --absGap <n>\n absolute gap |primal-dual| to stop" << std::endl
<< " --relGap <n>\n relative gap |primal-dual|/<solver-dep> to stop. Default 1e-8, set <0 "
"to use backend's default"
<< std::endl
<< " --feasTol <n>\n primal feasibility tolerance. Default 1e-8" << std::endl
<< " --intTol <n>\n integrality tolerance for a variable. Gurobi recommends at least "
"feasTol. Default 1e-8"
<< std::endl
// << " --objDiff <n> objective function discretization. Default 1.0" << std::endl
<< " --nonConvex <n>\n non-convexity. -1: solver default, 0: none, 1: if presolved, 2: "
"global. Default value 2."
<< std::endl
<< "\n --gurobi-dll <file> or <basename>\n Gurobi DLL, or base name, such as gurobi75, "
"when using plugin. Default range tried: "
<< gurobi_dlls().front() << " .. " << gurobi_dlls().back() << std::endl
<< std::endl;
}
bool MIPGurobiWrapper::FactoryOptions::processOption(int& i, std::vector<std::string>& argv,
const std::string& workingDir) {
MiniZinc::CLOParser cop(i, argv);
return cop.get("--gurobi-dll", &gurobiDll);
}
bool MIPGurobiWrapper::Options::processOption(int& i, std::vector<std::string>& argv,
const std::string& workingDir) {
MiniZinc::CLOParser cop(i, argv);
std::string buf;
if (cop.get("-i")) {
flagIntermediate = true;
} else if (string(argv[i]) == "-f") { // NOLINT: Allow repeated empty if
} else if (string(argv[i]) == "--fixed-search") { // NOLINT: Allow repeated empty if
nFreeSearch = MIPGurobiWrapper::SearchType::FIXED_SEARCH;
} else if (string(argv[i]) == "--uniform-search") { // NOLINT: Allow repeated empty if
nFreeSearch = MIPGurobiWrapper::SearchType::UNIFORM_SEARCH;
} else if (cop.get("--mipfocus --mipFocus --MIPFocus --MIPfocus",
&nMIPFocus)) { // NOLINT: Allow repeated empty if
} else if (cop.get("--writeModel --exportModel --writemodel --exportmodel", &buf)) {
sExportModel = MiniZinc::FileUtils::file_path(buf, workingDir);
} else if (cop.get("-p --parallel", &nThreads)) { // NOLINT: Allow repeated empty if
} else if (cop.get("--solver-time-limit --solver-time",
&nTimeout1000)) { // NOLINT: Allow repeated empty if
} else if (cop.get("--solver-time-limit-feas --solver-tlf",
&nTimeoutFeas1000)) { // NOLINT: Allow repeated empty if
} else if (cop.get("-n --num-solutions", &nSolLimit)) { // NOLINT: Allow repeated empty if
} else if (cop.get("-r --random-seed", &nSeed)) { // NOLINT: Allow repeated empty if
} else if (cop.get("--workmem --nodefilestart",
&nWorkMemLimit)) { // NOLINT: Allow repeated empty if
} else if (cop.get("--nodefiledir --NodefileDir",
&sNodefileDir)) { // NOLINT: Allow repeated empty if
} else if (cop.get("--readParam --readParams", &buf)) {
sReadParams = MiniZinc::FileUtils::file_path(buf, workingDir);
} else if (cop.get("--writeParam --writeParams", &buf)) {
sWriteParams = MiniZinc::FileUtils::file_path(buf, workingDir);
} else if (cop.get("--readConcurrentParam --readConcurrentParams", &buf)) {
sConcurrentParamFiles.push_back(MiniZinc::FileUtils::file_path(buf, workingDir));
} else if (cop.get("--absGap", &absGap)) { // NOLINT: Allow repeated empty if
} else if (cop.get("--relGap", &relGap)) { // NOLINT: Allow repeated empty if
} else if (cop.get("--feasTol", &feasTol)) { // NOLINT: Allow repeated empty if
} else if (cop.get("--intTol", &intTol)) { // NOLINT: Allow repeated empty if
} else if (cop.get("--nonConvex --nonconvex --NonConvex",
&nonConvex)) { // NOLINT: Allow repeated empty if
// } else if ( cop.get( "--objDiff", &objDiff ) ) {
} else {
return false;
}
return true;
}
void MIPGurobiWrapper::wrapAssert(bool cond, const string& msg, bool fTerm) {
if (!cond) {
_gurobiBuffer = "[NO ERROR STRING GIVEN]";
if (_error != 0) {
_gurobiBuffer = dll_GRBgeterrormsg(_env);
}
string msgAll =
(" MIPGurobiWrapper runtime error: " + _gurobiBuffer + "\nMessage from caller: " + msg);
cerr << msgAll << "\nGurobi error code: " << _error << endl;
if (fTerm) {
cerr << "TERMINATING." << endl;
throw runtime_error(msgAll);
}
}
}
#ifdef GUROBI_PLUGIN
namespace {
void* dll_open(const char* file) {
#ifdef HAS_DLFCN_H
if (MiniZinc::FileUtils::is_absolute(file)) {
return dlopen(file, RTLD_NOW);
}
return dlopen((std::string("lib") + file + ".so").c_str(), RTLD_NOW);
#else
if (MiniZinc::FileUtils::is_absolute(file)) {
return LoadLibrary(file);
}
return LoadLibrary((std::string(file) + ".dll").c_str());
#endif
}
void* dll_sym(void* dll, const char* sym) {
#ifdef HAS_DLFCN_H
void* ret = dlsym(dll, sym);
#else
void* ret = GetProcAddress((HMODULE)dll, sym);
#endif
if (ret == nullptr) {
throw MiniZinc::InternalError("cannot load symbol " + string(sym) + " from gurobi dll");
}
return ret;
}
void dll_close(void* dll) {
#ifdef HAS_DLFCN_H
dlclose(dll);
#else
FreeLibrary((HMODULE)dll);
#endif
}
} // namespace
#endif
void MIPGurobiWrapper::checkDLL() {
#ifdef GUROBI_PLUGIN
_gurobiDll = nullptr;
if (!_factoryOptions.gurobiDll.empty()) {
_gurobiDll = dll_open(_factoryOptions.gurobiDll.c_str());
} else {
for (const auto& s : gurobi_dlls()) {
_gurobiDll = dll_open(s.c_str());
if (nullptr != _gurobiDll) {
break;
}
}
}
if (_gurobiDll == nullptr) {
if (_factoryOptions.gurobiDll.empty()) {
throw MiniZinc::InternalError("cannot load gurobi dll, specify --gurobi-dll");
}
throw MiniZinc::InternalError("cannot load gurobi dll `" + _factoryOptions.gurobiDll + "'");
}
*(void**)(&dll_GRBversion) = dll_sym(_gurobiDll, "GRBversion");
*(void**)(&dll_GRBaddconstr) = dll_sym(_gurobiDll, "GRBaddconstr");
*(void**)(&dll_GRBaddgenconstrMin) = dll_sym(_gurobiDll, "GRBaddgenconstrMin");
*(void**)(&dll_GRBaddqconstr) = dll_sym(_gurobiDll, "GRBaddqconstr");
*(void**)(&dll_GRBaddgenconstrIndicator) = dll_sym(_gurobiDll, "GRBaddgenconstrIndicator");
*(void**)(&dll_GRBaddvars) = dll_sym(_gurobiDll, "GRBaddvars");
*(void**)(&dll_GRBcbcut) = dll_sym(_gurobiDll, "GRBcbcut");
*(void**)(&dll_GRBcbget) = dll_sym(_gurobiDll, "GRBcbget");
*(void**)(&dll_GRBcblazy) = dll_sym(_gurobiDll, "GRBcblazy");
*(void**)(&dll_GRBfreeenv) = dll_sym(_gurobiDll, "GRBfreeenv");
*(void**)(&dll_GRBfreemodel) = dll_sym(_gurobiDll, "GRBfreemodel");
*(void**)(&dll_GRBgetdblattr) = dll_sym(_gurobiDll, "GRBgetdblattr");
*(void**)(&dll_GRBgetdblattrarray) = dll_sym(_gurobiDll, "GRBgetdblattrarray");
*(void**)(&dll_GRBgetenv) = dll_sym(_gurobiDll, "GRBgetenv");
*(void**)(&dll_GRBgeterrormsg) = dll_sym(_gurobiDll, "GRBgeterrormsg");
*(void**)(&dll_GRBgetintattr) = dll_sym(_gurobiDll, "GRBgetintattr");
*(void**)(&dll_GRBloadenv) = dll_sym(_gurobiDll, "GRBloadenv");
*(void**)(&dll_GRBgetconcurrentenv) = dll_sym(_gurobiDll, "GRBgetconcurrentenv");
*(void**)(&dll_GRBnewmodel) = dll_sym(_gurobiDll, "GRBnewmodel");
*(void**)(&dll_GRBoptimize) = dll_sym(_gurobiDll, "GRBoptimize");
*(void**)(&dll_GRBreadparams) = dll_sym(_gurobiDll, "GRBreadparams");
*(void**)(&dll_GRBsetcallbackfunc) = dll_sym(_gurobiDll, "GRBsetcallbackfunc");
*(void**)(&dll_GRBsetdblparam) = dll_sym(_gurobiDll, "GRBsetdblparam");
*(void**)(&dll_GRBsetintattr) = dll_sym(_gurobiDll, "GRBsetintattr");
*(void**)(&dll_GRBsetintattrlist) = dll_sym(_gurobiDll, "GRBsetintattrlist");
*(void**)(&dll_GRBsetdblattrelement) = dll_sym(_gurobiDll, "GRBsetdblattrelement");
*(void**)(&dll_GRBsetdblattrlist) = dll_sym(_gurobiDll, "GRBsetdblattrlist");
*(void**)(&dll_GRBsetobjectiven) = dll_sym(_gurobiDll, "GRBsetobjectiven");
*(void**)(&dll_GRBsetintparam) = dll_sym(_gurobiDll, "GRBsetintparam");
*(void**)(&dll_GRBsetstrparam) = dll_sym(_gurobiDll, "GRBsetstrparam");
*(void**)(&dll_GRBterminate) = dll_sym(_gurobiDll, "GRBterminate");
*(void**)(&dll_GRBupdatemodel) = dll_sym(_gurobiDll, "GRBupdatemodel");
*(void**)(&dll_GRBwrite) = dll_sym(_gurobiDll, "GRBwrite");
*(void**)(&dll_GRBwriteparams) = dll_sym(_gurobiDll, "GRBwriteparams");
*(void**)(&dll_GRBemptyenv) = dll_sym(_gurobiDll, "GRBemptyenv");
*(void**)(&dll_GRBgetnumparams) = dll_sym(_gurobiDll, "GRBgetnumparams");
*(void**)(&dll_GRBgetparamname) = dll_sym(_gurobiDll, "GRBgetparamname");
*(void**)(&dll_GRBgetparamtype) = dll_sym(_gurobiDll, "GRBgetparamtype");
*(void**)(&dll_GRBgetintparaminfo) = dll_sym(_gurobiDll, "GRBgetintparaminfo");
*(void**)(&dll_GRBgetdblparaminfo) = dll_sym(_gurobiDll, "GRBgetdblparaminfo");
*(void**)(&dll_GRBgetstrparaminfo) = dll_sym(_gurobiDll, "GRBgetstrparaminfo");
#else
dll_GRBversion = GRBversion;
dll_GRBaddconstr = GRBaddconstr;
dll_GRBaddgenconstrIndicator = GRBaddgenconstrIndicator;
dll_GRBaddvars = GRBaddvars;
dll_GRBcbcut = GRBcbcut;
dll_GRBcbget = GRBcbget;
dll_GRBcblazy = GRBcblazy;
dll_GRBfreeenv = GRBfreeenv;
dll_GRBfreemodel = GRBfreemodel;
dll_GRBgetdblattr = GRBgetdblattr;
dll_GRBgetdblattrarray = GRBgetdblattrarray;
dll_GRBgetenv = GRBgetenv;
dll_GRBgeterrormsg = GRBgeterrormsg;
dll_GRBgetintattr = GRBgetintattr;
dll_GRBloadenv = GRBloadenv;
dll_GRBnewmodel = GRBnewmodel;
dll_GRBoptimize = GRBoptimize;
dll_GRBreadparams = GRBreadparams;
dll_GRBsetcallbackfunc = GRBsetcallbackfunc;
dll_GRBsetdblparam = GRBsetdblparam;
dll_GRBsetintattr = GRBsetintattr;
dll_GRBsetintattrlist = GRBsetintattrlist;
dll_GRBsetdblattrelement = GRBsetdblattrelement;
dll_GRBsetdblattrlist = GRBsetdblattrlist;
dll_GRBsetintparam = GRBsetintparam;
dll_GRBsetstrparam = GRBsetstrparam;
dll_GRBterminate = GRBterminate;
dll_GRBupdatemodel = GRBupdatemodel;
dll_GRBwrite = GRBwrite;
dll_GRBwriteparams = GRBwriteparams;
dll_GRBemptyenv = GRBemptyenv;
dll_GRBgetnumparams = GRBgetnumparams;
dll_GRBgetparamname = GRBgetparamname;
dll_GRBgetparamtype = GRBgetparamtype;
dll_GRBgetintparaminfo = dll_GRBgetintparaminfo;
dll_GRBgetdblparaminfo = dll_GRBgetdblparaminfo;
dll_GRBgetstrparaminfo = dll_GRBgetstrparaminfo;
#endif
}
void MIPGurobiWrapper::openGUROBI() {
checkDLL();
/* Initialize the GUROBI environment */
{
// cout << "% " << flush; // Gurobi 7.5.2 prints "Academic License..."
MiniZinc::StreamRedir redirStdout(stdout, stderr);
_error = dll_GRBloadenv(&_env, nullptr);
}
wrapAssert(_error == 0, "Could not open GUROBI environment.");
_error = dll_GRBsetintparam(_env, "OutputFlag", 0); // Switch off output
// _error = dll_GRBsetintparam(_env, "LogToConsole",
// fVerbose ? 1 : 0); // also when flagIntermediate? TODO
/* Create the problem. */
_error =
dll_GRBnewmodel(_env, &_model, "mzn_gurobi", 0, nullptr, nullptr, nullptr, nullptr, nullptr);
wrapAssert(_model != nullptr, "Failed to create LP.");
}
void MIPGurobiWrapper::closeGUROBI() {
/* Free model */
// If not allocated, skip
if (nullptr != _model) {
/* Free up the problem as allocated by GRB_createprob, if necessary */
dll_GRBfreemodel(_model);
_model = nullptr;
}
/* Free environment */
if (nullptr != _env) {
dll_GRBfreeenv(_env);
}
/// and at last:
// MIPWrapper::cleanup();
#ifdef GUROBI_PLUGIN
// dll_close(_gurobiDll); // Is called too many times, disabling. 2019-05-06
#endif
}
std::vector<MiniZinc::SolverConfig::ExtraFlag> MIPGurobiWrapper::getExtraFlags(
FactoryOptions& factoryOpt) {
enum GurobiParamType { T_INT = 1, T_DOUBLE = 2, T_STRING = 3 };
MIPGurobiWrapper mgw(factoryOpt, nullptr);
GRBenv* env;
try {
mgw.checkDLL();
mgw.dll_GRBemptyenv(&env);
int num_params = mgw.dll_GRBgetnumparams(env);
std::vector<MiniZinc::SolverConfig::ExtraFlag> flags;
flags.reserve(num_params);
for (int i = 0; i < num_params; i++) {
char* name;
mgw.dll_GRBgetparamname(env, i, &name);
std::string param_name(name);
MiniZinc::SolverConfig::ExtraFlag::FlagType param_type;
std::vector<std::string> param_range;
std::string param_default;
int type = mgw.dll_GRBgetparamtype(env, name);
if (param_name == GRB_INT_PAR_THREADS || param_name == GRB_DBL_PAR_TIMELIMIT ||
param_name == GRB_INT_PAR_SOLUTIONLIMIT || param_name == GRB_INT_PAR_SEED ||
param_name == GRB_DBL_PAR_NODEFILESTART || param_name == GRB_STR_PAR_NODEFILEDIR ||
param_name == GRB_DBL_PAR_MIPGAPABS || param_name == GRB_INT_PAR_MIPFOCUS ||
param_name == GRB_DBL_PAR_MIPGAP || param_name == GRB_DBL_PAR_INTFEASTOL ||
param_name == GRB_DBL_PAR_FEASIBILITYTOL ||
#ifdef GRB_INT_PAR_NONCONVEX
param_name == GRB_INT_PAR_NONCONVEX ||
#endif
param_name == GRB_INT_PAR_PRECRUSH || param_name == GRB_INT_PAR_LAZYCONSTRAINTS ||
param_name == GRB_STR_PAR_DUMMY) {
// These parameters are handled by us or are not useful
continue;
}
switch (type) {
case T_INT: {
int current_value;
int min_value;
int max_value;
int default_value;
mgw.dll_GRBgetintparaminfo(env, name, &current_value, &min_value, &max_value,
&default_value);
param_type = MiniZinc::SolverConfig::ExtraFlag::FlagType::T_INT;
param_range = {std::to_string(min_value), std::to_string(max_value)};
param_default = std::to_string(default_value);
break;
}
case T_DOUBLE: {
double current_value;
double min_value;
double max_value;
double default_value;
mgw.dll_GRBgetdblparaminfo(env, name, &current_value, &min_value, &max_value,
&default_value);
param_type = MiniZinc::SolverConfig::ExtraFlag::FlagType::T_FLOAT;
param_range = {std::to_string(min_value), std::to_string(max_value)};
param_default = std::to_string(default_value);
break;
}
case T_STRING: {
char current_value[GRB_MAX_STRLEN];
char default_value[GRB_MAX_STRLEN];
mgw.dll_GRBgetstrparaminfo(env, name, current_value, default_value);
param_type = MiniZinc::SolverConfig::ExtraFlag::FlagType::T_STRING;
param_default = default_value;
break;
}
default:
break;
}
flags.emplace_back("--gurobi-" + param_name, param_name, param_type, param_range,
param_default);
}
return flags;
} catch (MiniZinc::InternalError&) {
return {};
}
return {};
}
void MIPGurobiWrapper::doAddVars(size_t n, double* obj, double* lb, double* ub,
MIPWrapper::VarType* vt, string* names) {
/// Convert var types:
vector<char> ctype(n);
vector<char*> pcNames(n);
for (size_t i = 0; i < n; ++i) {
pcNames[i] = (char*)names[i].c_str();
switch (vt[i]) {
case REAL:
ctype[i] = GRB_CONTINUOUS;
break;
case INT:
ctype[i] = GRB_INTEGER;
break;
case BINARY:
ctype[i] = GRB_BINARY;
break;
default:
throw runtime_error(" MIPWrapper: unknown variable type");
}
}
_error = dll_GRBaddvars(_model, static_cast<int>(n), 0, nullptr, nullptr, nullptr, obj, lb, ub,
&ctype[0], &pcNames[0]);
wrapAssert(_error == 0, "Failed to declare variables.");
_error = dll_GRBupdatemodel(_model);
wrapAssert(_error == 0, "Failed to update model.");
}
static char get_grb_sense(MIPWrapper::LinConType s) {
switch (s) {
case MIPWrapper::LQ:
return GRB_LESS_EQUAL;
case MIPWrapper::EQ:
return GRB_EQUAL;
case MIPWrapper::GQ:
return GRB_GREATER_EQUAL;
default:
throw runtime_error(" MIPGurobiWrapper: unknown constraint sense");
}
}
void MIPGurobiWrapper::addRow(int nnz, int* rmatind, double* rmatval, MIPWrapper::LinConType sense,
double rhs, int mask, const string& rowName) {
//// Make sure in order to notice the indices of lazy constr:
++nRows;
/// Convert var types:
char ssense = get_grb_sense(sense);
const char* pRName = rowName.c_str();
_error = dll_GRBaddconstr(_model, nnz, rmatind, rmatval, ssense, rhs, pRName);
wrapAssert(_error == 0, "Failed to add constraint.");
int nLazyAttr = 0;
const bool fUser = (MaskConsType_Usercut & mask) != 0;
const bool fLazy = (MaskConsType_Lazy & mask) != 0;
/// Gurobi 6.5.2 has lazyness 1-3.
if (fUser) {
if (fLazy) {
nLazyAttr = 2; // just active lazy
} else {
nLazyAttr = 3; // even LP-active
}
} else if (fLazy) {
nLazyAttr = 1; // very lazy
}
if (nLazyAttr != 0) {
nLazyIdx.push_back(nRows - 1);
nLazyValue.push_back(nLazyAttr);
}
}
void MIPGurobiWrapper::addIndicatorConstraint(int iBVar, int bVal, int nnz, int* rmatind,
double* rmatval, MIPWrapper::LinConType sense,
double rhs, const string& rowName) {
wrapAssert(0 <= bVal && 1 >= bVal, "Gurobi: addIndicatorConstraint: bVal not 0/1");
//// Make sure in order to notice the indices of lazy constr: also here? TODO
++nRows;
char ssense = get_grb_sense(sense);
_error = dll_GRBaddgenconstrIndicator(_model, rowName.c_str(), iBVar, bVal, nnz, rmatind, rmatval,
ssense, rhs);
wrapAssert(_error == 0, "Failed to add indicator constraint.");
}
void MIPGurobiWrapper::addMinimum(int iResultVar, int nnz, int* ind, const std::string& rowName) {
_error = dll_GRBaddgenconstrMin(_model, rowName.c_str(), iResultVar, nnz, (const int*)ind,
GRB_INFINITY);
wrapAssert(_error == 0, "Failed: GRBaddgenconstrMin.");
}
void MIPGurobiWrapper::addTimes(int x, int y, int z, const string& rowName) {
/// As x*y - z == 0
double zCoef = -1.0;
double xyCoef = 1.0;
_error =
dll_GRBaddqconstr(_model, 1, &z, &zCoef, 1, &x, &y, &xyCoef, GRB_EQUAL, 0.0, rowName.c_str());
/// Gurobi 9.0.1 says we cannot have GRB_EQUAL but seems to work.
wrapAssert(_error == 0, "Failed: GRBaddqconstr.");
}
bool MIPGurobiWrapper::addSearch(const std::vector<VarId>& vars, const std::vector<int>& pri) {
assert(vars.size() == pri.size());
static_assert(sizeof(VarId) == sizeof(int), "VarId should be (u)int currently");
_error = dll_GRBsetintattrlist(_model, "BranchPriority", static_cast<int>(vars.size()),
(int*)vars.data(), (int*)pri.data());
wrapAssert(_error == 0, "Failed to add branching priorities");
return true;
}
int MIPGurobiWrapper::getFreeSearch() { return _options->nFreeSearch; }
bool MIPGurobiWrapper::addWarmStart(const std::vector<VarId>& vars,
const std::vector<double>& vals) {
assert(vars.size() == vals.size());
static_assert(sizeof(VarId) == sizeof(int), "VarId should be (u)int currently");
// _error = GRBsetdblattrelement(_model, "Start", 0, 1.0);
_error = dll_GRBsetdblattrlist(_model, "Start", static_cast<int>(vars.size()), (int*)vars.data(),
(double*)vals.data());
wrapAssert(_error == 0, "Failed to add warm start");
return true;
}
bool MIPGurobiWrapper::defineMultipleObjectives(const MultipleObjectives& mo) {
setObjSense(1); // Maximize
for (int iobj = 0; iobj < mo.size(); ++iobj) {
const auto& obj = mo.getObjectives()[iobj];
int objvar = obj.getVariable();
double coef = 1.0;
_error = dll_GRBsetobjectiven(_model, iobj, static_cast<int>(mo.size()) - iobj, obj.getWeight(),
0.0, 0.0, nullptr, 0.0, 1, &objvar, &coef);
wrapAssert(_error == 0, "Failed to set objective " + std::to_string(iobj));
}
return true;
}
void MIPGurobiWrapper::setVarBounds(int iVar, double lb, double ub) {
wrapAssert(lb <= ub, "mzn-gurobi: setVarBounds: lb>ub");
_error = dll_GRBsetdblattrelement(_model, GRB_DBL_ATTR_LB, iVar, lb);
wrapAssert(_error == 0, "mzn-gurobi: failed to set var lb.");
_error = dll_GRBsetdblattrelement(_model, GRB_DBL_ATTR_UB, iVar, ub);
wrapAssert(_error == 0, "mzn-gurobi: failed to set var ub.");
}
void MIPGurobiWrapper::setVarLB(int iVar, double lb) {
_error = dll_GRBsetdblattrelement(_model, GRB_DBL_ATTR_LB, iVar, lb);
wrapAssert(_error == 0, "mzn-gurobi: failed to set var lb.");
}
void MIPGurobiWrapper::setVarUB(int iVar, double ub) {
_error = dll_GRBsetdblattrelement(_model, GRB_DBL_ATTR_UB, iVar, ub);
wrapAssert(_error == 0, "mzn-gurobi: failed to set var ub.");
}
/// SolutionCallback ------------------------------------------------------------------------
/// Gurobi ensures thread-safety
static int __stdcall solcallback(GRBmodel* model, void* cbdata, int where, void* usrdata) {
auto* info = (MIPWrapper::CBUserInfo*)usrdata;
auto* gw = static_cast<MIPGurobiWrapper*>(info->wrapper);
double nodecnt = 0.0;
double actnodes = 0.0;
double objVal = 0.0;
int solcnt = 0;
int newincumbent = 0;
if (GRB_CB_MIP == where) {
/* General MIP callback */
gw->dll_GRBcbget(cbdata, where, GRB_CB_MIP_OBJBND, &info->pOutput->bestBound);
gw->dll_GRBcbget(cbdata, where, GRB_CB_MIP_NODLFT, &actnodes);
info->pOutput->nOpenNodes = static_cast<int>(actnodes);
/// Check time after the 1st feas
if (-1e100 != info->nTime1Feas) {
double tNow;
gw->dll_GRBcbget(cbdata, where, GRB_CB_RUNTIME, (void*)&tNow);
if (tNow - info->nTime1Feas >= info->nTimeoutFeas) {
gw->dll_GRBterminate(model);
}
}
} else if (GRB_CB_MESSAGE == where) {
/* Message callback */
if (info->fVerb) {
char* msg;
gw->dll_GRBcbget(cbdata, where, GRB_CB_MSG_STRING, &msg);
cerr << msg << flush;
}
} else if (GRB_CB_MIPSOL == where) {
/* MIP solution callback */
gw->dll_GRBcbget(cbdata, where, GRB_CB_MIPSOL_NODCNT, &nodecnt);
info->pOutput->nNodes = static_cast<int>(nodecnt);
gw->dll_GRBcbget(cbdata, where, GRB_CB_MIPSOL_OBJ, &objVal);
gw->dll_GRBcbget(cbdata, where, GRB_CB_MIPSOL_SOLCNT, &solcnt);
if (fabs(info->pOutput->objVal - objVal) > 1e-12 * (1.0 + fabs(objVal))) {
newincumbent = 1;
// Not confirmed yet, see lazy cuts
// info->pOutput->objVal = objVal;
// info->pOutput->status = MIPWrapper::SAT;
// info->pOutput->statusName = "feasible from a callback";
}
if (newincumbent != 0) {
assert(info->pOutput->x);
gw->dll_GRBcbget(cbdata, where, GRB_CB_MIPSOL_SOL, (void*)info->pOutput->x);
info->pOutput->dWallTime = std::chrono::duration<double>(std::chrono::steady_clock::now() -
info->pOutput->dWallTime0)
.count();
info->pOutput->dCPUTime = double(std::clock() - info->pOutput->cCPUTime0) / CLOCKS_PER_SEC;
}
/// Callback for lazy cuts
/// Before printing
if ((info->cutcbfn != nullptr) && ((info->cutMask & MIPWrapper::MaskConsType_Lazy) != 0)) {
MIPWrapper::CutInput cutInput;
cerr << " GRB: GRB_CB_MIPSOL (" << objVal << ") -> cut callback " << endl;
info->cutcbfn(*info->pOutput, cutInput, info->psi, true);
for (auto& cd : cutInput) {
// assert( cd.mask & MIPWrapper::MaskConsType_Lazy );
if ((cd.mask & MIPWrapper::MaskConsType_Lazy) != 0) { // take only lazy constr generators
int _error =
gw->dll_GRBcblazy(cbdata, static_cast<int>(cd.rmatind.size()), cd.rmatind.data(),
cd.rmatval.data(), get_grb_sense(cd.sense), cd.rhs);
if (_error != 0) {
cerr << " GRB_wrapper: failed to add lazy cut. " << endl;
} else {
newincumbent = -1;
}
// info->pOutput->objVal = 1e100; // to mark that we can get a new incumbent
// which should be printed
}
}
}
if (solcnt >= 0 /*This is solution number for Gurobi*/ && newincumbent >= 0) {
if (fabs(info->pOutput->objVal - objVal) > 1e-12 * (1.0 + fabs(objVal))) {
newincumbent = 1;
info->pOutput->objVal = objVal;
info->pOutput->status = MIPWrapper::SAT;
info->pOutput->statusName = "feasible from a callback";
}
}
if (newincumbent > 0) {
info->pOutput->dCPUTime = double(std::clock() - info->pOutput->cCPUTime0) / CLOCKS_PER_SEC;
/// Set time for the 1st feas
if (0 <= info->nTimeoutFeas && -1e100 == info->nTime1Feas) {
gw->dll_GRBcbget(cbdata, where, GRB_CB_RUNTIME, (void*)&info->nTime1Feas);
}
/// Call the user function:
if (info->solcbfn != nullptr) {
(*info->solcbfn)(*info->pOutput, info->psi);
}
if (0 == info->nTimeoutFeas) {
gw->dll_GRBterminate(model); // Straight after feas
}
}
} else if (GRB_CB_MIPNODE == where) {
int status;
gw->dll_GRBcbget(cbdata, where, GRB_CB_MIPNODE_STATUS, &status);
if (status == GRB_OPTIMAL && (info->cutcbfn != nullptr)) { // if cut handler given
MIPWrapper::Output outpRlx;
outpRlx.x = info->pOutput->x; // using the sol output storage TODO?
outpRlx.nCols = info->pOutput->nCols;
assert(outpRlx.x && outpRlx.nCols);
// dll_GRBcbget(cbdata, where, GRB_CB_MIPNODE_RELOBJ, outpRlx.objVal);
gw->dll_GRBcbget(cbdata, where, GRB_CB_MIPNODE_REL, (void*)outpRlx.x);
// cerr << " GRB: GRB_CB_MIPNODE -> cut callback " << endl;
MIPWrapper::CutInput cutInput;
info->cutcbfn(outpRlx, cutInput, info->psi, false);
// static int nCuts=0;
// nCuts += cutInput.size();
// if ( cutInput.size() )
// cerr << "\n N CUTS: " << nCuts << endl;
for (auto& cd : cutInput) {
if ((cd.mask & (MIPWrapper::MaskConsType_Usercut | MIPWrapper::MaskConsType_Lazy)) == 0) {
throw runtime_error("Cut callback: should be user/lazy");
}
if ((cd.mask & MIPWrapper::MaskConsType_Usercut) != 0) {
int _error =
gw->dll_GRBcbcut(cbdata, static_cast<int>(cd.rmatind.size()), cd.rmatind.data(),
cd.rmatval.data(), get_grb_sense(cd.sense), cd.rhs);
if (_error != 0) {
cerr << " GRB_wrapper: failed to add user cut. " << endl;
}
}
if ((cd.mask & MIPWrapper::MaskConsType_Lazy) != 0) {
int _error =
gw->dll_GRBcblazy(cbdata, static_cast<int>(cd.rmatind.size()), cd.rmatind.data(),
cd.rmatval.data(), get_grb_sense(cd.sense), cd.rhs);
if (_error != 0) {
cerr << " GRB_wrapper: failed to add lazy cut. " << endl;
}
}
}
}
}
return 0;
} /* END logcallback */
// end SolutionCallback ---------------------------------------------------------------------
MIPGurobiWrapper::Status MIPGurobiWrapper::convertStatus(int gurobiStatus) {
Status s = Status::UNKNOWN;
ostringstream oss;
/* Converting the status. */
if (gurobiStatus == GRB_OPTIMAL) {
s = Status::OPT;
oss << "Optimal";
} else if (gurobiStatus == GRB_INF_OR_UNBD) {
s = Status::UNSATorUNBND;
oss << "Infeasible or unbounded";
} else if (gurobiStatus == GRB_INFEASIBLE) {
s = Status::UNSAT;
oss << "Infeasible";
} else if (gurobiStatus == GRB_UNBOUNDED) {
oss << "Unbounded";
s = Status::UNBND;
} else {
int solcount = 0;
_error = dll_GRBgetintattr(_model, "SolCount", &solcount);
wrapAssert(_error == 0, " Failure to access solution count.", false);
if (solcount != 0) {
s = Status::SAT;
}
oss << "Gurobi stopped with status " << gurobiStatus;
}
output.statusName = _gurobiStatusBuffer = oss.str();
return s;
}
void MIPGurobiWrapper::solve() { // Move into ancestor?
_error = dll_GRBupdatemodel(_model); // for model export
wrapAssert(_error == 0, "Failed to update model.");
/// ADDING LAZY CONSTRAINTS IF ANY
if (!nLazyIdx.empty()) {
assert(nLazyIdx.size() == nLazyValue.size());
if (fVerbose) {
cerr << " MIPGurobiWrapper: marking " << nLazyIdx.size() << " lazy cuts." << endl;
}
_error = dll_GRBsetintattrlist(_model, "Lazy", static_cast<int>(nLazyIdx.size()),
nLazyIdx.data(), nLazyValue.data());
wrapAssert(_error == 0, "Failed to set constraint attribute.");
nLazyIdx.clear();
nLazyValue.clear();
_error = dll_GRBupdatemodel(_model); // for model export
wrapAssert(_error == 0, "Failed to update model after modifying some constraint attr.");
}
/////////////// Last-minute solver options //////////////////
/* Turn on output to file */
_error = dll_GRBsetstrparam(dll_GRBgetenv(_model), "LogFile",
""); // FAILS to switch off in Ubuntu 15.04
/* Turn on output to the screen */
_error = dll_GRBsetintparam(dll_GRBgetenv(_model), "OutputFlag",
/*fVerbose ? 1 :*/ 0); // switch off, redirect in callback
// _error = dll_GRBsetintparam(dll_GRBgetenv(_model), "LogToConsole",
// fVerbose ? 1 : 0); // also when flagIntermediate? TODO
wrapAssert(_error == 0, " GUROBI Warning: Failure to switch screen indicator.", false);
// _error = dll_GRB_setintparam (_env, GRB_PARAM_ClockType, 1); // CPU time
// _error = dll_GRB_setintparam (_env, GRB_PARAM_MIP_Strategy_CallbackReducedLP, GRB__OFF); //
// Access original model
if (!_options->sExportModel.empty()) {
_error = dll_GRBwrite(_model, _options->sExportModel.c_str());
wrapAssert(_error == 0, "Failed to write LP to disk.", false);
}
/// TODO
// if(all_solutions && obj.getImpl()) {
// IloNum lastObjVal = (obj.getSense() == IloObjective::Minimize ) ?
// _ilogurobi->use(SolutionCallback(_iloenv, lastObjVal, *this));
// Turn off GUROBI logging
if (_options->nThreads > 0) {
_error = dll_GRBsetintparam(dll_GRBgetenv(_model), GRB_INT_PAR_THREADS, _options->nThreads);
// int nn; // THE SETTING FAILS TO WORK IN 6.0.5.
// _error = dll_getintparam(_env, GRB_INT_PAR_THREADS, &nn);
// cerr << "Set " << nThreads << " threads, reported " << nn << endl;
wrapAssert(_error == 0, "Failed to set GRB_INT_PAR_THREADS.", false);
}
if (_options->nTimeout1000 > 0) {
_error = dll_GRBsetdblparam(dll_GRBgetenv(_model), GRB_DBL_PAR_TIMELIMIT,
static_cast<double>(_options->nTimeout1000) / 1000.0);
wrapAssert(_error == 0, "Failed to set GRB_PARAM_TimeLimit.", false);
}
if (_options->nSolLimit > 0) {
_error =
dll_GRBsetintparam(dll_GRBgetenv(_model), GRB_INT_PAR_SOLUTIONLIMIT, _options->nSolLimit);
wrapAssert(_error == 0, "Failed to set GRB_INT_PAR_SOLLIMIT.", false);
}
if (_options->nSeed >= 0) {
_error = dll_GRBsetintparam(dll_GRBgetenv(_model), GRB_INT_PAR_SEED, _options->nSeed);
wrapAssert(_error == 0, "Failed to set GRB_INT_PAR_SEED.", false);
}
if (_options->nWorkMemLimit > 0 && _options->nWorkMemLimit < 1e200) {
_error = dll_GRBsetdblparam(dll_GRBgetenv(_model), "NodefileStart", _options->nWorkMemLimit);
wrapAssert(_error == 0, "Failed to set NodefileStart.", false);
}
if (!_options->sNodefileDir.empty()) {
_error =
dll_GRBsetstrparam(dll_GRBgetenv(_model), "NodefileDir", _options->sNodefileDir.c_str());
wrapAssert(_error == 0, "Failed to set NodefileDir.", false);
}
if (_options->absGap >= 0.0) {
_error = dll_GRBsetdblparam(dll_GRBgetenv(_model), "MIPGapAbs", _options->absGap);
wrapAssert(_error == 0, "Failed to set MIPGapAbs.", false);
}
if (_options->nMIPFocus > 0) {
_error = dll_GRBsetintparam(dll_GRBgetenv(_model), GRB_INT_PAR_MIPFOCUS, _options->nMIPFocus);
wrapAssert(_error == 0, "Failed to set GRB_INT_PAR_MIPFOCUS.", false);
}
if (_options->relGap >= 0.0) {
_error = dll_GRBsetdblparam(dll_GRBgetenv(_model), "MIPGap", _options->relGap);
wrapAssert(_error == 0, "Failed to set MIPGap.", false);
}
if (_options->intTol >= 0.0) {
_error = dll_GRBsetdblparam(dll_GRBgetenv(_model), "IntFeasTol", _options->intTol);
wrapAssert(_error == 0, "Failed to set IntFeasTol.", false);
}
if (_options->feasTol >= 0.0) {
_error = dll_GRBsetdblparam(dll_GRBgetenv(_model), "FeasibilityTol", _options->feasTol);
wrapAssert(_error == 0, "Failed to set FeasTol.", false);
}
if (_options->nonConvex >= 0) {
#ifdef GRB_INT_PAR_NONCONVEX
int major;
int minor;
int technical;
dll_GRBversion(&major, &minor, &technical);
if (major >= 9) {
_error =
dll_GRBsetintparam(dll_GRBgetenv(_model), GRB_INT_PAR_NONCONVEX, _options->nonConvex);
wrapAssert(_error == 0, "Failed to set " GRB_INT_PAR_NONCONVEX, false);
} else {
std::cerr << "WARNING: Non-convex solving is unavailable in this version of Gurobi"
<< std::endl;
}
#else
std::cerr << "WARNING: Non-convex solving is unavailable in this version of Gurobi"
<< std::endl;
#endif
}
/// Solution callback
output.nCols = static_cast<int>(colObj.size());
_x.resize(output.nCols);
output.x = &_x[0];
SolCallbackFn solcbfn = cbui.solcbfn;
if (true) { // NOLINT: Need for logging
cbui.fVerb = fVerbose;
cbui.nTimeoutFeas = _options->nTimeoutFeas1000 / 1000.0;
if (!_options->flagIntermediate) {
cbui.solcbfn = nullptr;
}
if (cbui.cutcbfn != nullptr) {
assert(cbui.cutMask & (MaskConsType_Usercut | MaskConsType_Lazy));
if ((cbui.cutMask & MaskConsType_Usercut) != 0) {
// For user cuts, needs to keep some info after presolve
if (fVerbose) {
cerr << " MIPGurobiWrapper: user cut callback enabled, setting PreCrush=1" << endl;
}
_error = dll_GRBsetintparam(dll_GRBgetenv(_model), GRB_INT_PAR_PRECRUSH, 1);
wrapAssert(_error == 0, "Failed to set GRB_INT_PAR_PRECRUSH.", false);
}
if ((cbui.cutMask & MaskConsType_Lazy) != 0) {
// For lazy cuts, Gurobi disables some presolves
if (fVerbose) {
cerr << " MIPGurobiWrapper: lazy cut callback enabled, setting LazyConstraints=1"
<< endl;
}
_error = dll_GRBsetintparam(dll_GRBgetenv(_model), GRB_INT_PAR_LAZYCONSTRAINTS, 1);
wrapAssert(_error == 0, "Failed to set GRB_INT_PAR_LAZYCONSTRAINTS.", false);
}
}
_error = dll_GRBsetcallbackfunc(_model, solcallback, (void*)&cbui);
wrapAssert(_error == 0, "Failed to set callback", false);
}
// Process extra flags options
for (auto& it : _options->extraParams) {
auto name = it.first.substr(9);
int type = dll_GRBgetparamtype(dll_GRBgetenv(_model), name.c_str());
enum GurobiParamType { T_INT = 1, T_DOUBLE = 2, T_STRING = 3 };
switch (type) {
case T_INT:
_error = dll_GRBsetintparam(dll_GRBgetenv(_model), name.c_str(), stoi(it.second));
break;
case T_DOUBLE:
_error = dll_GRBsetdblparam(dll_GRBgetenv(_model), name.c_str(), stod(it.second));
break;
case T_STRING:
_error = dll_GRBsetstrparam(dll_GRBgetenv(_model), name.c_str(), it.second.c_str());
break;
default:
wrapAssert(false, "Could not determine type of parameter " + name, false);
break;
}
wrapAssert(_error == 0, "Failed to set parameter " + name + " = " + it.second, false);
}
/// after all modifs
if (!_options->sReadParams.empty()) {
_error = dll_GRBreadparams(dll_GRBgetenv(_model), _options->sReadParams.c_str());
wrapAssert(_error == 0, "Failed to read GUROBI parameters.", false);
}
if (!_options->sWriteParams.empty()) {
_error = dll_GRBwriteparams(dll_GRBgetenv(_model), _options->sWriteParams.c_str());
wrapAssert(_error == 0, "Failed to write GUROBI parameters.", false);
}
/* See if we should set up concurrent solving */
if (!_options->sConcurrentParamFiles.empty()) {
int iSetting = -1;
for (const auto& paramFile : _options->sConcurrentParamFiles) {
++iSetting;
auto* env_i = dll_GRBgetconcurrentenv(_model, iSetting);
_error = dll_GRBreadparams(env_i, paramFile.c_str());
wrapAssert(_error == 0, "Failed to read GUROBI parameters from file " + paramFile, false);
}
}
cbui.pOutput->dWallTime0 = output.dWallTime0 = std::chrono::steady_clock::now();
output.dCPUTime = cbui.pOutput->cCPUTime0 = std::clock();
/* Optimize the problem and obtain solution. */
_error = dll_GRBoptimize(_model);
wrapAssert(_error == 0, "Failed to optimize MIP.");
output.dWallTime =
std::chrono::duration<double>(std::chrono::steady_clock::now() - output.dWallTime0).count();
output.dCPUTime = (std::clock() - output.dCPUTime) / CLOCKS_PER_SEC;
int solstat;
_error = dll_GRBgetintattr(_model, GRB_INT_ATTR_STATUS, &solstat);
wrapAssert(_error == 0, "Failed to get MIP status.", false);
output.status = convertStatus(solstat);
/// Continuing to fill the output object:
if (Status::OPT == output.status || Status::SAT == output.status) {
_error = dll_GRBgetdblattr(_model, GRB_DBL_ATTR_OBJVAL, &output.objVal);
wrapAssert(_error == 0, "No MIP objective value available.");
// int cur_numrows = dll_GRB_getnumrows (env, lp);
int cur_numcols = getNCols();
assert(cur_numcols == colObj.size());
_x.resize(cur_numcols);
output.x = &_x[0];
_error = dll_GRBgetdblattrarray(_model, GRB_DBL_ATTR_X, 0, cur_numcols, (double*)output.x);
wrapAssert(_error == 0, "Failed to get variable values.");
if (!_options->flagIntermediate && (solcbfn != nullptr)) {
solcbfn(output, cbui.psi);
}
}
output.bestBound = std::numeric_limits<double>::has_quiet_NaN
? std::numeric_limits<double>::quiet_NaN()
: std::numeric_limits<double>::max();
int nObj = 0;
dll_GRBgetintattr(_model, GRB_INT_ATTR_NUMOBJ, &nObj);
if (1 >= nObj) {
_error = dll_GRBgetdblattr(_model, GRB_DBL_ATTR_OBJBOUNDC, &output.bestBound);
wrapAssert(_error == 0, "Failed to get the best bound.", false);
}
double nNodes = -1;
_error = dll_GRBgetdblattr(_model, GRB_DBL_ATTR_NODECOUNT, &nNodes);
output.nNodes = static_cast<int>(nNodes);
output.nOpenNodes = 0;
}
void MIPGurobiWrapper::setObjSense(int s) {
_error = dll_GRBsetintattr(_model, GRB_INT_ATTR_MODELSENSE, s > 0 ? GRB_MAXIMIZE : GRB_MINIMIZE);
wrapAssert(_error == 0, "Failed to set obj sense.");
}
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