259 lines
10 KiB
C++
259 lines
10 KiB
C++
// Copyright 2010-2018 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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// Command line interface to the MPSolver class.
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// See linear_solver.h and kUsageStr below.
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#include <csignal>
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#include <cstdio>
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#include <string>
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#include "absl/strings/match.h"
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#include "absl/strings/str_format.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/integral_types.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/linear_solver/linear_solver.h"
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#include "ortools/linear_solver/linear_solver.pb.h"
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#include "ortools/lp_data/mps_reader.h"
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#include "ortools/lp_data/proto_utils.h"
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#include "ortools/util/file_util.h"
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DEFINE_string(input, "", "REQUIRED: Input file name.");
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DEFINE_string(solver, "glop",
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"The solver to use: bop, cbc, clp, glop, glpk_lp, glpk_mip, "
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"gurobi_lp, gurobi_mip, scip, knapsack.");
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DEFINE_int32(num_threads, 1,
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"Number of threads to use by the underlying solver.");
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DEFINE_string(params_file, "",
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"Solver specific parameters file. "
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"If this flag is set, the --params flag is ignored.");
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DEFINE_string(params, "", "Solver specific parameters");
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DEFINE_int64(time_limit_ms, 0,
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"If strictly positive, specifies a limit in ms on the solving "
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"time. Otherwise, no time limit will be imposed.");
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DEFINE_string(output_csv, "",
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"If non-empty, write the returned solution in csv format with "
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"each line formed by a variable name and its value.");
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DEFINE_string(dump_format, "text",
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"Format in which to dump protos (if flags --dump_model, "
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"--dump_request, or --dump_response are used). Possible values: "
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"'text', 'binary', 'json' which correspond to text proto format "
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"binary proto format, and json. If 'binary' or 'json' are used, "
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"we append '.bin' and '.json' to file names.");
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DEFINE_bool(dump_gzip, false,
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"Whether to gzip dumped protos. Appends .gz to their name.");
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DEFINE_string(dump_model, "", "If non-empty, dumps MPModelProto there.");
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DEFINE_string(dump_request, "", "If non-empty, dumps MPModelRequest there.");
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DEFINE_string(dump_response, "", "If non-empty, dumps MPModelResponse there.");
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DECLARE_bool(verify_solution); // Defined in ./linear_solver.cc
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static const char kUsageStr[] =
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"Run MPSolver on the given input file. Many formats are supported: \n"
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" - a .mps or .mps.gz file,\n"
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" - an MPModelProto (binary or text, possibly gzipped),\n"
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" - an MPModelRequest (binary or text, possibly gzipped).\n"
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"MPModelProto and MPModelRequest files can comply with either the "
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"linear_solver.proto or the linear_solver.proto format.";
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namespace operations_research {
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namespace {
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// Returns false if an error was encountered.
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// More details should be available in the logs.
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bool Run() {
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// Create the solver and set its parameters.
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MPSolver::OptimizationProblemType type;
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CHECK(MPSolver::ParseSolverType(FLAGS_solver, &type))
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<< "Unsupported --solver: " << FLAGS_solver;
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// Load the problem into an MPModelProto.
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MPModelProto model_proto;
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MPModelRequest request_proto;
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if (absl::EndsWith(FLAGS_input, ".mps") ||
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absl::EndsWith(FLAGS_input, ".mps.gz")) {
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CHECK_OK(glop::MPSReader().ParseFile(FLAGS_input, &model_proto))
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<< "Error while parsing the mps file '" << FLAGS_input << "'.";
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} else {
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ReadFileToProto(FLAGS_input, &model_proto);
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ReadFileToProto(FLAGS_input, &request_proto);
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// If the input proto is in binary format, both ReadFileToProto could return
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// true. Instead use the actual number of variables found to test the
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// correct format of the input.
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const bool is_model_proto = model_proto.variable_size() > 0;
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const bool is_request_proto = request_proto.model().variable_size() > 0;
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if (!is_model_proto && !is_request_proto) {
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LOG(FATAL) << "Failed to parse '" << FLAGS_input
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<< "' as an MPModelProto or an MPModelRequest.";
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} else {
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CHECK(!(is_model_proto && is_request_proto));
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if (is_request_proto) {
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LOG(INFO) << "Read input proto as an MPModelRequest.";
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model_proto.Swap(request_proto.mutable_model());
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} else {
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LOG(INFO) << "Read input proto as an MPModelProto.";
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}
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}
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}
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printf("%-12s: '%s'\n", "File", FLAGS_input.c_str());
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// Detect format to dump protos.
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operations_research::ProtoWriteFormat write_format;
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if (FLAGS_dump_format == "text") {
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write_format = ProtoWriteFormat::kProtoText;
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} else if (FLAGS_dump_format == "binary") {
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write_format = ProtoWriteFormat::kProtoBinary;
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} else if (FLAGS_dump_format == "json") {
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write_format = ProtoWriteFormat::kJson;
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} else {
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LOG(FATAL) << "Unsupported --dump_format: " << FLAGS_dump_format;
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}
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// Create the solver, we use the name of the model as the solver name.
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MPSolver solver(model_proto.name(), type);
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const util::Status set_num_threads_status =
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solver.SetNumThreads(FLAGS_num_threads);
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if (set_num_threads_status.ok()) {
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LOG(INFO) << "Set number of threads to " << FLAGS_num_threads << ".";
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} else {
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LOG(ERROR) << "Failed to set number of threads due to: "
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<< set_num_threads_status.message() << ". Using 1 as default.";
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}
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solver.EnableOutput();
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if (!FLAGS_params_file.empty()) {
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std::string file_contents;
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CHECK_OK(
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file::GetContents(FLAGS_params_file, &file_contents, file::Defaults()))
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<< "Could not read parameters file.";
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CHECK(solver.SetSolverSpecificParametersAsString(file_contents));
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} else if (!FLAGS_params.empty()) {
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CHECK(solver.SetSolverSpecificParametersAsString(FLAGS_params))
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<< "Wrong --params format.";
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}
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printf("%-12s: %s\n", "Solver",
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MPModelRequest::SolverType_Name(
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static_cast<MPModelRequest::SolverType>(solver.ProblemType()))
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.c_str());
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// Load the proto into the solver.
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std::string error_message;
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// If requested, save the model to file.
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if (!FLAGS_dump_model.empty()) {
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CHECK(WriteProtoToFile(FLAGS_dump_model, model_proto, write_format,
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FLAGS_dump_gzip));
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}
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const MPSolverResponseStatus status =
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solver.LoadModelFromProtoWithUniqueNamesOrDie(model_proto,
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&error_message);
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if (request_proto.has_solver_time_limit_seconds()) {
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solver.set_time_limit(
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static_cast<int64>(1000.0 * request_proto.solver_time_limit_seconds()));
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}
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// Note, the underlying MPSolver treats time limit equal to 0 as no limit.
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if (FLAGS_time_limit_ms >= 0) {
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solver.set_time_limit(FLAGS_time_limit_ms);
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}
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if (status != MPSOLVER_MODEL_IS_VALID) {
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LOG(ERROR) << MPSolverResponseStatus_Name(status) << ": " << error_message;
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return false;
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}
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printf("%-12s: %d x %d\n", "Dimension", solver.NumConstraints(),
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solver.NumVariables());
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// Solve.
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MPSolverParameters param;
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MPSolver::ResultStatus solve_status = MPSolver::NOT_SOLVED;
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absl::Duration solving_time;
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const absl::Time time_before = absl::Now();
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solve_status = solver.Solve(param);
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solving_time = absl::Now() - time_before;
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// If requested, re-create a corresponding MPModelRequest and save it to file.
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if (!FLAGS_dump_request.empty()) {
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operations_research::MPModelRequest request;
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request.set_solver_type(
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static_cast<MPModelRequest::SolverType>(solver.ProblemType()));
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request.set_solver_time_limit_seconds(solver.time_limit_in_secs());
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request.set_solver_specific_parameters(
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solver.GetSolverSpecificParametersAsString());
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*request.mutable_model() = model_proto;
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CHECK(WriteProtoToFile(FLAGS_dump_request, request, write_format,
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FLAGS_dump_gzip));
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}
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const bool has_solution =
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solve_status == MPSolver::OPTIMAL || solve_status == MPSolver::FEASIBLE;
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// If requested, get the MPModelResponse and save it to file.
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if (!FLAGS_dump_response.empty() && has_solution) {
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operations_research::MPSolutionResponse response;
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solver.FillSolutionResponseProto(&response);
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CHECK(WriteProtoToFile(FLAGS_dump_response, response, write_format,
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FLAGS_dump_gzip));
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}
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if (!FLAGS_output_csv.empty() && has_solution) {
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operations_research::MPSolutionResponse result;
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solver.FillSolutionResponseProto(&result);
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std::string csv_file;
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for (int i = 0; i < result.variable_value_size(); ++i) {
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csv_file += absl::StrFormat("%s,%e\n", model_proto.variable(i).name(),
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result.variable_value(i));
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}
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CHECK_OK(file::SetContents(FLAGS_output_csv, csv_file, file::Defaults()));
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}
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// If --verify_solution is true, we already verified it. If not, we add
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// a verification step here.
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if (has_solution && !FLAGS_verify_solution) {
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LOG(INFO) << "Verifying the solution";
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solver.VerifySolution(/*tolerance=*/param.GetDoubleParam(
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MPSolverParameters::PRIMAL_TOLERANCE),
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/*log_errors=*/true);
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}
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printf("%-12s: %s\n", "Status",
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MPSolverResponseStatus_Name(
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static_cast<MPSolverResponseStatus>(solve_status))
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.c_str());
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printf("%-12s: %15.15e\n", "Objective",
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has_solution ? solver.Objective().Value() : 0.0);
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printf("%-12s: %15.15e\n", "BestBound",
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has_solution ? solver.Objective().BestBound() : 0.0);
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absl::PrintF("%-12s: %d\n", "Iterations", solver.iterations());
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// NOTE(user): nodes() for non-MIP solvers crashes in debug mode by design.
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if (solver.IsMIP()) {
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absl::PrintF("%-12s: %d\n", "Nodes", solver.nodes());
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}
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printf("%-12s: %-6.4g\n", "Time", absl::ToDoubleSeconds(solving_time));
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return true;
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}
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} // namespace
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} // namespace operations_research
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int main(int argc, char** argv) {
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gflags::ParseCommandLineFlags(&argc, &argv, /*remove_flags=*/true);
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CHECK(!FLAGS_input.empty()) << "--input is required";
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operations_research::Run();
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return EXIT_SUCCESS;
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}
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