RhodeCode

      // Maximum path length for partial augment

      const int MAX_PATH_LENGTH = 4;

      // Initialize data structures for buckets

      _max_rank = _alpha * _res_node_num;

      _buckets.resize(_max_rank);

      _bucket_next.resize(_res_node_num + 1);

      _bucket_prev.resize(_res_node_num + 1);

      _rank.resize(_res_node_num + 1);

      // Execute the algorithm

      switch (method) {

        case PUSH:

          startPush();

          break;

        case AUGMENT:

          break;

        case PARTIAL_AUGMENT:

          startAugment(MAX_PATH_LENGTH);

          break;

      }

      // Compute node potentials for the original costs

      _arc_vec.clear();

      _cost_vec.clear();

      for (int j = 0; j != _res_arc_num; ++j) {

        if (_res_cap[j] > 0) {

          _arc_vec.push_back(IntPair(_source[j], _target[j]));

          _cost_vec.push_back(_scost[j]);

        }

      }

      _sgr.build(_res_node_num, _arc_vec.begin(), _arc_vec.end());

          }

        }

        if (total_excess <= 0) break;

      }

      // Relabel nodes

      for (int u = 0; u != _res_node_num; ++u) {

        int k = std::min(_rank[u], r);

        if (k > 0) {

          _pi[u] -= _epsilon * k;

          _next_out[u] = _first_out[u];

        }

      }

    }

    /// Execute the algorithm performing augment and relabel operations

      // Paramters for heuristics

      const int EARLY_TERM_EPSILON_LIMIT = 1000;

      const double GLOBAL_UPDATE_FACTOR = 3.0;

      const int global_update_freq = int(GLOBAL_UPDATE_FACTOR *

        (_res_node_num + _sup_node_num * _sup_node_num));

      int next_update_limit = global_update_freq;

      int relabel_cnt = 0;

      // Perform cost scaling phases

      std::vector<int> path;

      for ( ; _epsilon >= 1; _epsilon = _epsilon < _alpha && _epsilon > 1 ?

                                        1 : _epsilon / _alpha )

      {

        // Early termination heuristic