source: lemon-0.x/test/bipartite_matching_test.cc @ 2462:7a096a6bf53a

/* -*- C++ -*-
 *
 * This file is a part of LEMON, a generic C++ optimization library
 *
 * Copyright (C) 2003-2007
 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
 * (Egervary Research Group on Combinatorial Optimization, EGRES).
 *
 * Permission to use, modify and distribute this software is granted
 * provided that this copyright notice appears in all copies. For
 * precise terms see the accompanying LICENSE file.
 *
 * This software is provided "AS IS" with no warranty of any kind,
 * express or implied, and with no claim as to its suitability for any
 * purpose.
 *
 */

#include <cstdlib>
#include <iostream>
#include <sstream>

#include <lemon/smart_graph.h>

#include <lemon/bpugraph_adaptor.h>
#include <lemon/bipartite_matching.h>
#include <lemon/pr_bipartite_matching.h>

#include <lemon/graph_utils.h>

#include <lemon/maps.h>

#include "test_tools.h"

using namespace std;
using namespace lemon;

typedef SmartBpUGraph Graph;
BPUGRAPH_TYPEDEFS(Graph);

const int N = 10;
const int M = 10;
const int E = 52;
const int C = 100;

const int sa[E] = { 6, 5, 6, 4, 1, 0, 9, 5, 2, 4, 4, 3, 5,
                    2, 3, 8, 3, 4, 9, 6, 9, 4, 3, 1, 5, 8,
                    4, 8, 9, 2, 2, 3, 0, 5, 2, 3, 6, 3, 8,
                    8, 4, 0, 9, 9, 6, 2, 1, 2, 7, 1, 9, 4};

const int ta[E] = { 2, 7, 4, 8, 6, 3, 4, 1, 7, 7, 0, 1, 6,
                    3, 2, 6, 8, 3, 5, 6, 3, 1, 8, 7, 2, 0,
                    6, 9, 6, 7, 8, 3, 3, 4, 5, 8, 6, 4, 1,
                    4, 3, 3, 8, 7, 7, 3, 7, 7, 3, 5, 1, 6};

const int wa[E] = { 3, 99, 85, 16, 79, 52, 83, 99, 62, 6, 42, 6, 95,
                    13, 34, 9, 5, 38, 39, 75, 99, 12, 73, 35, 93, 43,
                    54, 91, 45, 26, 77, 47, 11, 22, 50, 74, 37, 64, 91,
                    60, 6, 92, 29, 46, 34, 84, 67, 34, 45, 0, 39, 47};


int main() {
  Graph graph;
  vector<Node> aNodes;
  vector<Node> bNodes;

  Graph::UEdgeMap<int> weight(graph);

  int max_cardinality;
  int max_weight;
  int max_cardinality_max_weight;
  int min_cost_matching;

  for (int i = 0; i < N; ++i) {
    Node node = graph.addANode();
    aNodes.push_back(node);
  }
  for (int i = 0; i < M; ++i) {
    Node node = graph.addBNode();
    bNodes.push_back(node);
  }
  for (int i = 0; i < E; ++i) {
    Node aNode = aNodes[sa[i]];
    Node bNode = bNodes[ta[i]];
    UEdge uedge = graph.addEdge(aNode, bNode);
    weight[uedge] = wa[i];
  }


  {
    MaxBipartiteMatching<Graph> bpmatch(graph);

    bpmatch.run();

    Graph::UEdgeMap<bool> mm(graph);
    Graph::NodeMap<bool> cs(graph);
    
    check(bpmatch.coverSet(cs) == bpmatch.matching(mm), "INVALID PRIMAL-DUAL");
    
    for (UEdgeIt it(graph); it != INVALID; ++it) {
      check(cs[graph.aNode(it)] || cs[graph.bNode(it)], "INVALID DUAL");
    }
    
    for (ANodeIt it(graph); it != INVALID; ++it) {
      int num = 0;
      for (IncEdgeIt jt(graph, it); jt != INVALID; ++jt) {
        if (mm[jt]) ++num;
      }
      check(num <= 1, "INVALID PRIMAL");
    }
    max_cardinality = bpmatch.matchingSize();
  }

  {
    PrBipartiteMatching<Graph> bpmatch(graph);

    bpmatch.run();

    Graph::UEdgeMap<bool> mm(graph);
    Graph::NodeMap<bool> cs(graph);
    
    check(bpmatch.coverSet(cs) == bpmatch.matching(mm), "INVALID PRIMAL-DUAL");
    
    for (UEdgeIt it(graph); it != INVALID; ++it) {
      check(cs[graph.aNode(it)] || cs[graph.bNode(it)], "INVALID DUAL");
    }
    
    for (ANodeIt it(graph); it != INVALID; ++it) {
      int num = 0;
      for (IncEdgeIt jt(graph, it); jt != INVALID; ++jt) {
        if (mm[jt]) ++num;
      }
      check(num <= 1, "INVALID PRIMAL");
    }
    max_cardinality = bpmatch.matchingSize();
  }

  {
    Graph::UEdgeMap<bool> mm(graph);

    check(max_cardinality == maxBipartiteMatching(graph, mm),
          "WRONG MATCHING");
    
    for (ANodeIt it(graph); it != INVALID; ++it) {
      int num = 0;
      for (IncEdgeIt jt(graph, it); jt != INVALID; ++jt) {
        if (mm[jt]) ++num;
      }
      check(num <= 1, "INVALID PRIMAL");
    }
  }

  {
    MaxBipartiteMatching<Graph> bpmatch(graph);

    bpmatch.greedyInit();
    bpmatch.start();

    Graph::UEdgeMap<bool> mm(graph);
    Graph::NodeMap<bool> cs(graph);

    check(bpmatch.coverSet(cs) == bpmatch.matching(mm), "INVALID PRIMAL-DUAL");
    
    for (UEdgeIt it(graph); it != INVALID; ++it) {
      check(cs[graph.aNode(it)] || cs[graph.bNode(it)], "INVALID DUAL");
    }
    
    for (ANodeIt it(graph); it != INVALID; ++it) {
      int num = 0;
      for (IncEdgeIt jt(graph, it); jt != INVALID; ++jt) {
        if (mm[jt]) ++num;
    }
      check(num <= 1, "INVALID PRIMAL");
    }
  }

  {
    MaxBipartiteMatching<Graph> bpmatch(graph);

    bpmatch.greedyInit();
    while (bpmatch.simpleAugment());
    
    Graph::UEdgeMap<bool> mm(graph);
    Graph::NodeMap<bool> cs(graph);
    
    check(bpmatch.coverSet(cs) == bpmatch.matching(mm), "INVALID PRIMAL-DUAL");
    
    for (UEdgeIt it(graph); it != INVALID; ++it) {
      check(cs[graph.aNode(it)] || cs[graph.bNode(it)], "INVALID DUAL");
    }
    
    for (ANodeIt it(graph); it != INVALID; ++it) {
      int num = 0;
      for (IncEdgeIt jt(graph, it); jt != INVALID; ++jt) {
        if (mm[jt]) ++num;
    }
      check(num <= 1, "INVALID PRIMAL");
    }
  }

  {
    MaxWeightedBipartiteMatching<Graph> bpmatch(graph, weight);

    bpmatch.init();

    max_weight = 0;
    while (bpmatch.augment(true)) {
    
      Graph::UEdgeMap<bool> mm(graph);
      Graph::NodeMap<int> pm(graph);
      
      bpmatch.matching(mm);
      bpmatch.potential(pm);
      
      for (UEdgeIt it(graph); it != INVALID; ++it) {
        if (mm[it]) {
          check(pm[graph.aNode(it)] + pm[graph.bNode(it)] - weight[it] == 0,
                "INVALID DUAL");
        } else {
          check(pm[graph.aNode(it)] + pm[graph.bNode(it)] - weight[it] >= 0,
                "INVALID DUAL");
        }
      }

      for (ANodeIt it(graph); it != INVALID; ++it) {
        int num = 0;
        for (IncEdgeIt jt(graph, it); jt != INVALID; ++jt) {
          if (mm[jt]) ++num;
        }
        check(num <= 1, "INVALID PRIMAL");
      }
      if (bpmatch.matchingValue() > max_weight) {
        max_weight = bpmatch.matchingValue();
      }
    }
  }

  {
    Graph::UEdgeMap<bool> mm(graph);

    check(max_weight == maxWeightedBipartiteMatching(graph, weight, mm),
          "WRONG MATCHING");
    
    for (ANodeIt it(graph); it != INVALID; ++it) {
      int num = 0;
      for (IncEdgeIt jt(graph, it); jt != INVALID; ++jt) {
        if (mm[jt]) ++num;
      }
      check(num <= 1, "INVALID PRIMAL");
    }
  }

  {
    MaxWeightedBipartiteMatching<Graph> bpmatch(graph, weight);

    bpmatch.run();
    
    Graph::UEdgeMap<bool> mm(graph);
    Graph::NodeMap<int> pm(graph);

    bpmatch.matching(mm);
    bpmatch.potential(pm);
    
    for (UEdgeIt it(graph); it != INVALID; ++it) {
      if (mm[it]) {
        check(pm[graph.aNode(it)] + pm[graph.bNode(it)] - weight[it] == 0,
              "INVALID DUAL");
      } else {
        check(pm[graph.aNode(it)] + pm[graph.bNode(it)] - weight[it] >= 0,
              "INVALID DUAL");
      }
    }

    for (ANodeIt it(graph); it != INVALID; ++it) {
      int num = 0;
      for (IncEdgeIt jt(graph, it); jt != INVALID; ++jt) {
        if (mm[jt]) ++num;
    }
      check(num <= 1, "INVALID PRIMAL");
    }
    check(max_weight == bpmatch.matchingValue(), "WRONG WEIGHT");
  }

  {
    MaxWeightedBipartiteMatching<Graph> bpmatch(graph, weight);

    bpmatch.run(true);
    
    Graph::UEdgeMap<bool> mm(graph);
    Graph::NodeMap<int> pm(graph);

    bpmatch.matching(mm);
    bpmatch.potential(pm);
    
    for (UEdgeIt it(graph); it != INVALID; ++it) {
      if (mm[it]) {
        check(pm[graph.aNode(it)] + pm[graph.bNode(it)] - weight[it] == 0,
              "INVALID DUAL");
      } else {
        check(pm[graph.aNode(it)] + pm[graph.bNode(it)] - weight[it] >= 0,
              "INVALID DUAL");
      }
    }

    for (ANodeIt it(graph); it != INVALID; ++it) {
      int num = 0;
      for (IncEdgeIt jt(graph, it); jt != INVALID; ++jt) {
        if (mm[jt]) ++num;
    }
      check(num <= 1, "INVALID PRIMAL");
    }
    check(max_cardinality == bpmatch.matchingSize(), "WRONG SIZE");
    max_cardinality_max_weight = bpmatch.matchingValue();

  }

  {
    Graph::UEdgeMap<bool> mm(graph);

    check(max_cardinality_max_weight == 
          maxWeightedMaxBipartiteMatching(graph, weight, mm),
          "WRONG MATCHING");
    
    for (ANodeIt it(graph); it != INVALID; ++it) {
      int num = 0;
      for (IncEdgeIt jt(graph, it); jt != INVALID; ++jt) {
        if (mm[jt]) ++num;
      }
      check(num <= 1, "INVALID PRIMAL");
    }
  }

  Graph::UEdgeMap<int> cost(graph);
  cost = subMap(constMap<UEdge>(C), weight);
  {

    MinCostMaxBipartiteMatching<Graph> bpmatch(graph, cost);

    bpmatch.run();
    
    Graph::UEdgeMap<bool> mm(graph);
    Graph::NodeMap<int> pm(graph);

    bpmatch.matching(mm);
    bpmatch.potential(pm);
    
    min_cost_matching = bpmatch.matchingCost();
    check(max_cardinality == bpmatch.matchingSize(), "WRONG SIZE");
    check(max_cardinality * C - max_cardinality_max_weight 
          == bpmatch.matchingCost(), "WRONG SIZE");

    for (UEdgeIt it(graph); it != INVALID; ++it) {
      if (mm[it]) {
        check(pm[graph.aNode(it)] + cost[it] - pm[graph.bNode(it)] == 0,
              "INVALID DUAL");
      } else {
        check(pm[graph.aNode(it)] + cost[it] - pm[graph.bNode(it)] >= 0,
              "INVALID DUAL");
      }
    }

    for (ANodeIt it(graph); it != INVALID; ++it) {
      int num = 0;
      for (IncEdgeIt jt(graph, it); jt != INVALID; ++jt) {
        if (mm[jt]) ++num;
    }
      check(num <= 1, "INVALID PRIMAL");
    }

    min_cost_matching = bpmatch.matchingCost();
    check(max_cardinality == bpmatch.matchingSize(), "WRONG SIZE");
    check(max_cardinality * C - max_cardinality_max_weight 
          == bpmatch.matchingCost(), "WRONG SIZE");

  }

  {
    Graph::UEdgeMap<bool> mm(graph);

    check(min_cost_matching == 
          minCostMaxBipartiteMatching(graph, cost, mm),
          "WRONG MATCHING");
    
    for (ANodeIt it(graph); it != INVALID; ++it) {
      int num = 0;
      for (IncEdgeIt jt(graph, it); jt != INVALID; ++jt) {
        if (mm[jt]) ++num;
      }
      check(num <= 1, "INVALID PRIMAL");
    }
  }

  return 0;
}