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| // Copyright 2010-2024 Google LLC | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| // A pybind11 wrapper for set_cover_*. | ||
|
|
||
| #include <memory> | ||
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|
||
| #include "absl/base/nullability.h" | ||
| #include "ortools/algorithms/set_cover_heuristics.h" | ||
| #include "ortools/algorithms/set_cover_invariant.h" | ||
| #include "ortools/algorithms/set_cover_model.h" | ||
| #include "ortools/algorithms/set_cover_reader.h" | ||
| #include "pybind11/pybind11.h" | ||
| #include "pybind11/pytypes.h" | ||
| #include "pybind11/stl.h" | ||
| #include "pybind11_protobuf/native_proto_caster.h" | ||
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|
||
| using ::operations_research::ElementDegreeSolutionGenerator; | ||
| using ::operations_research::GreedySolutionGenerator; | ||
| using ::operations_research::GuidedLocalSearch; | ||
| using ::operations_research::Preprocessor; | ||
| using ::operations_research::RandomSolutionGenerator; | ||
| using ::operations_research::ReadBeasleySetCoverProblem; | ||
| using ::operations_research::ReadRailSetCoverProblem; | ||
| using ::operations_research::SetCoverInvariant; | ||
| using ::operations_research::SetCoverModel; | ||
| using ::operations_research::SteepestSearch; | ||
| using ::operations_research::SubsetIndex; | ||
| using ::operations_research::TrivialSolutionGenerator; | ||
|
|
||
| namespace py = pybind11; | ||
| using ::py::arg; | ||
|
|
||
| // General note about TODOs: the corresponding functions/classes/methods are | ||
| // more complex to wrap, as they use nonstandard types, and are less important, | ||
| // as they are not as useful to most users (mostly useful to write some custom | ||
| // Python heuristics). | ||
|
|
||
| PYBIND11_MODULE(set_cover, m) { | ||
| pybind11_protobuf::ImportNativeProtoCasters(); | ||
|
|
||
| // set_cover_model.h | ||
| py::class_<SetCoverModel>(m, "SetCoverModel") | ||
| .def(py::init<>()) | ||
| .def_property_readonly("num_elements", &SetCoverModel::num_elements) | ||
| .def_property_readonly("num_subsets", &SetCoverModel::num_subsets) | ||
| .def_property_readonly("num_nonzeros", &SetCoverModel::num_nonzeros) | ||
| .def_property_readonly("fill_rate", &SetCoverModel::FillRate) | ||
| .def("add_empty_subset", &SetCoverModel::AddEmptySubset, arg("cost")) | ||
| .def( | ||
| "add_element_to_last_subset", | ||
| [](SetCoverModel& model, int element) { | ||
| model.AddElementToLastSubset(element); | ||
| }, | ||
| arg("element")) | ||
| .def( | ||
| "set_subset_cost", | ||
| [](SetCoverModel& model, int subset, double cost) { | ||
| model.SetSubsetCost(subset, cost); | ||
| }, | ||
| arg("subset"), arg("cost")) | ||
| .def( | ||
| "add_element_to_subset", | ||
| [](SetCoverModel& model, int element, int subset) { | ||
| model.AddElementToSubset(element, subset); | ||
| }, | ||
| arg("subset"), arg("cost")) | ||
| .def("compute_feasibility", &SetCoverModel::ComputeFeasibility) | ||
| .def( | ||
| "reserve_num_subsets", | ||
| [](SetCoverModel& model, int num_subsets) { | ||
| model.ReserveNumSubsets(num_subsets); | ||
| }, | ||
| arg("num_subsets")) | ||
| .def( | ||
| "reserve_num_elements_in_subset", | ||
| [](SetCoverModel& model, int num_elements, int subset) { | ||
| model.ReserveNumElementsInSubset(num_elements, subset); | ||
| }, | ||
| arg("num_elements"), arg("subset")) | ||
| .def("export_model_as_proto", &SetCoverModel::ExportModelAsProto) | ||
| .def("import_model_from_proto", &SetCoverModel::ImportModelFromProto); | ||
| // TODO(user): add support for subset_costs, columns, rows, | ||
| // row_view_is_valid, SubsetRange, ElementRange, all_subsets, | ||
| // CreateSparseRowView, ComputeCostStats, ComputeRowStats, | ||
| // ComputeColumnStats, ComputeRowDeciles, ComputeColumnDeciles. | ||
|
|
||
| // TODO(user): wrap IntersectingSubsetsIterator. | ||
|
|
||
| // set_cover_invariant.h | ||
| py::class_<SetCoverInvariant>(m, "SetCoverInvariant") | ||
| .def(py::init<SetCoverModel*>()) | ||
| .def("initialize", &SetCoverInvariant::Initialize) | ||
| .def("clear", &SetCoverInvariant::Clear) | ||
| .def("recompute_invariant", &SetCoverInvariant::RecomputeInvariant) | ||
| .def("model", &SetCoverInvariant::model) | ||
| .def_property( | ||
| "model", | ||
| // Expected semantics: give a pointer to Python **while | ||
| // keeping ownership** in C++. | ||
| [](SetCoverInvariant& invariant) -> std::shared_ptr<SetCoverModel> { | ||
| // https://pybind11.readthedocs.io/en/stable/advanced/smart_ptrs.html#std-shared-ptr | ||
| std::shared_ptr<SetCoverModel> ptr(invariant.model()); | ||
| return ptr; | ||
| }, | ||
| [](SetCoverInvariant& invariant, const SetCoverModel& model) { | ||
| *invariant.model() = model; | ||
| }) | ||
| .def("cost", &SetCoverInvariant::cost) | ||
| .def("num_uncovered_elements", &SetCoverInvariant::num_uncovered_elements) | ||
| .def("clear_trace", &SetCoverInvariant::ClearTrace) | ||
| .def("clear_removability_information", | ||
| &SetCoverInvariant::ClearRemovabilityInformation) | ||
| .def("compress_trace", &SetCoverInvariant::CompressTrace) | ||
| .def("check_consistency", &SetCoverInvariant::CheckConsistency) | ||
| .def( | ||
| "flip", | ||
| [](SetCoverInvariant& invariant, int subset) { | ||
| invariant.Flip(SubsetIndex(subset)); | ||
| }, | ||
| arg("subset")) | ||
| .def( | ||
| "flip_and_fully_update", | ||
| [](SetCoverInvariant& invariant, int subset) { | ||
| invariant.FlipAndFullyUpdate(SubsetIndex(subset)); | ||
| }, | ||
| arg("subset")) | ||
| .def( | ||
| "select", | ||
| [](SetCoverInvariant& invariant, int subset) { | ||
| invariant.Select(SubsetIndex(subset)); | ||
| }, | ||
| arg("subset")) | ||
| .def( | ||
| "select_and_fully_update", | ||
| [](SetCoverInvariant& invariant, int subset) { | ||
| invariant.SelectAndFullyUpdate(SubsetIndex(subset)); | ||
| }, | ||
| arg("subset")) | ||
| .def( | ||
| "deselect", | ||
| [](SetCoverInvariant& invariant, int subset) { | ||
| invariant.Deselect(SubsetIndex(subset)); | ||
| }, | ||
| arg("subset")) | ||
| .def( | ||
| "deselect_and_fully_update", | ||
| [](SetCoverInvariant& invariant, int subset) { | ||
| invariant.DeselectAndFullyUpdate(SubsetIndex(subset)); | ||
| }, | ||
| arg("subset")) | ||
| .def("export_solution_as_proto", | ||
| &SetCoverInvariant::ExportSolutionAsProto) | ||
| .def("import_solution_from_proto", | ||
| &SetCoverInvariant::ImportSolutionFromProto); | ||
| // TODO(user): add support for is_selected, num_free_elements, | ||
| // num_coverage_le_1_elements, coverage, ComputeCoverageInFocus, | ||
| // is_redundant, trace, new_removable_subsets, new_non_removable_subsets, | ||
| // LoadSolution, ComputeIsRedundant. | ||
|
|
||
| // set_cover_heuristics.h | ||
| py::class_<Preprocessor>(m, "Preprocessor") | ||
| .def(py::init<absl::Nonnull<SetCoverInvariant*>>()) | ||
| .def("next_solution", | ||
| [](Preprocessor& heuristic) -> bool { | ||
| return heuristic.NextSolution(); | ||
| }) | ||
| .def("num_columns_fixed_by_singleton_row", | ||
| &Preprocessor::num_columns_fixed_by_singleton_row); | ||
| // TODO(user): add support for focus argument. | ||
|
|
||
| py::class_<TrivialSolutionGenerator>(m, "TrivialSolutionGenerator") | ||
| .def(py::init<SetCoverInvariant*>()) | ||
| .def("next_solution", [](TrivialSolutionGenerator& heuristic) -> bool { | ||
| return heuristic.NextSolution(); | ||
| }); | ||
| // TODO(user): add support for focus argument. | ||
|
|
||
| py::class_<RandomSolutionGenerator>(m, "RandomSolutionGenerator") | ||
| .def(py::init<SetCoverInvariant*>()) | ||
| .def("next_solution", [](RandomSolutionGenerator& heuristic) -> bool { | ||
| return heuristic.NextSolution(); | ||
| }); | ||
| // TODO(user): add support for focus argument. | ||
|
|
||
| py::class_<GreedySolutionGenerator>(m, "GreedySolutionGenerator") | ||
| .def(py::init<SetCoverInvariant*>()) | ||
| .def("next_solution", [](GreedySolutionGenerator& heuristic) -> bool { | ||
| return heuristic.NextSolution(); | ||
| }); | ||
| // TODO(user): add support for focus and cost arguments. | ||
|
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| py::class_<ElementDegreeSolutionGenerator>(m, | ||
| "ElementDegreeSolutionGenerator") | ||
| .def(py::init<SetCoverInvariant*>()) | ||
| .def("next_solution", | ||
| [](ElementDegreeSolutionGenerator& heuristic) -> bool { | ||
| return heuristic.NextSolution(); | ||
| }); | ||
| // TODO(user): add support for focus and cost arguments. | ||
|
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| py::class_<SteepestSearch>(m, "SteepestSearch") | ||
| .def(py::init<SetCoverInvariant*>()) | ||
| .def("next_solution", | ||
| [](SteepestSearch& heuristic, int num_iterations) -> bool { | ||
| return heuristic.NextSolution(num_iterations); | ||
| }); | ||
| // TODO(user): add support for focus and cost arguments. | ||
|
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| py::class_<GuidedLocalSearch>(m, "GuidedLocalSearch") | ||
| .def(py::init<SetCoverInvariant*>()) | ||
| .def("initialize", &GuidedLocalSearch::Initialize) | ||
| .def("next_solution", | ||
| [](GuidedLocalSearch& heuristic, int num_iterations) -> bool { | ||
| return heuristic.NextSolution(num_iterations); | ||
| }); | ||
| // TODO(user): add support for focus and cost arguments. | ||
|
|
||
| // TODO(user): add support for ClearRandomSubsets, ClearRandomSubsets, | ||
| // ClearMostCoveredElements, ClearMostCoveredElements, TabuList, | ||
| // GuidedTabuSearch. | ||
|
|
||
| // set_cover_reader.h | ||
| m.def("read_beasly_set_cover_problem", &ReadBeasleySetCoverProblem); | ||
| m.def("read_rail_set_cover_problem", &ReadRailSetCoverProblem); | ||
|
|
||
| // set_cover_lagrangian.h | ||
| // TODO(user): add support for SetCoverLagrangian. | ||
| } |
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