110 lines
4.0 KiB
C++
110 lines
4.0 KiB
C++
// Copyright 2010-2021 Google LLC
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <numeric>
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#include "absl/flags/flag.h"
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#include "absl/status/status.h"
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#include "absl/strings/match.h"
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#include "absl/strings/str_cat.h"
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#include "absl/strings/str_join.h"
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#include "absl/strings/string_view.h"
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#include "ortools/base/commandlineflags.h"
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#include "ortools/base/file.h"
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#include "ortools/base/init_google.h"
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#include "ortools/base/logging.h"
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#include "ortools/base/timer.h"
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#include "ortools/packing/arc_flow_builder.h"
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#include "ortools/packing/arc_flow_solver.h"
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#include "ortools/packing/vector_bin_packing.pb.h"
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#include "ortools/packing/vector_bin_packing_parser.h"
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ABSL_FLAG(std::string, input, "", "Vector Bin Packing (.vpb) data file name.");
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ABSL_FLAG(std::string, params, "",
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"Parameters in solver specific text format.");
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ABSL_FLAG(std::string, solver, "sat", "Solver to use: sat, scip");
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ABSL_FLAG(double, time_limit, 900.0, "Time limit in seconds");
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ABSL_FLAG(int, threads, 1, "Number of threads");
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ABSL_FLAG(bool, display_proto, false, "Print the input protobuf");
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ABSL_FLAG(int, max_bins, -1,
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"Maximum number of bins: default = -1 meaning no limits");
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namespace operations_research {
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void ParseAndSolve(const std::string& filename, absl::string_view solver,
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const std::string& params) {
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std::string problem_name = filename;
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const size_t found = problem_name.find_last_of("/\\");
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if (found != std::string::npos) {
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problem_name = problem_name.substr(found + 1);
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}
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if (absl::EndsWith(problem_name, ".vbp")) {
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// TODO(user): Move naming code to parser.
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problem_name.resize(problem_name.size() - 4);
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}
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packing::vbp::VectorBinPackingProblem data;
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packing::vbp::VbpParser parser;
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if (!parser.ParseFile(filename)) {
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LOG(FATAL) << "Cannot read " << filename;
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}
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data = parser.problem();
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data.set_name(problem_name);
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if (data.max_bins() != 0) {
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LOG(WARNING)
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<< "Ignoring max_bins value. The feasibility problem is not supported.";
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}
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LOG(INFO) << "Solving vector packing problem '" << data.name() << "' with "
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<< data.item_size() << " item types, and "
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<< data.resource_capacity_size() << " dimensions.";
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if (absl::GetFlag(FLAGS_display_proto)) {
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LOG(INFO) << data.DebugString();
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}
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// Build optimization model.
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MPSolver::OptimizationProblemType solver_type;
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MPSolver::ParseSolverType(solver, &solver_type);
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packing::vbp::VectorBinPackingSolution solution =
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packing::SolveVectorBinPackingWithArcFlow(
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data, solver_type, params, absl::GetFlag(FLAGS_time_limit),
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absl::GetFlag(FLAGS_threads), absl::GetFlag(FLAGS_max_bins));
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if (!solution.bins().empty()) {
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for (int b = 0; b < solution.bins_size(); ++b) {
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LOG(INFO) << "Bin " << b;
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const packing::vbp::VectorBinPackingOneBinInSolution& bin =
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solution.bins(b);
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for (int i = 0; i < bin.item_indices_size(); ++i) {
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LOG(INFO) << " - item: " << bin.item_indices(i)
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<< ", copies: " << bin.item_copies(i);
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}
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}
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}
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}
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} // namespace operations_research
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int main(int argc, char** argv) {
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absl::SetFlag(&FLAGS_logtostderr, true);
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InitGoogle(argv[0], &argc, &argv, true);
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if (absl::GetFlag(FLAGS_input).empty()) {
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LOG(FATAL) << "Please supply a data file with --input=";
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}
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operations_research::ParseAndSolve(absl::GetFlag(FLAGS_input),
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absl::GetFlag(FLAGS_solver),
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absl::GetFlag(FLAGS_params));
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return EXIT_SUCCESS;
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}
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