Changeset 1045:fe283caf6414 in lemon for lemon/cost_scaling.h
 Timestamp:
 03/15/11 17:59:57 (8 years ago)
 Branch:
 default
 Phase:
 public
 File:

 1 edited
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 Added
 Removed

lemon/cost_scaling.h
r1042 r1045 576 576 } 577 577 578 /// \brief Reset all the parameters that have been given before. 579 /// 580 /// This function resets all the paramaters that have been given 581 /// before using functions \ref lowerMap(), \ref upperMap(), 582 /// \ref costMap(), \ref supplyMap(), \ref stSupply(). 583 /// 584 /// It is useful for multiple run() calls. If this function is not 585 /// used, all the parameters given before are kept for the next 586 /// \ref run() call. 587 /// However, the underlying digraph must not be modified after this 588 /// class have been constructed, since it copies and extends the graph. 578 /// \brief Reset the internal data structures and all the parameters 579 /// that have been given before. 580 /// 581 /// This function resets the internal data structures and all the 582 /// paramaters that have been given before using functions \ref lowerMap(), 583 /// \ref upperMap(), \ref costMap(), \ref supplyMap(), \ref stSupply(). 584 /// 585 /// It is useful for multiple \ref run() calls. By default, all the given 586 /// parameters are kept for the next \ref run() call, unless 587 /// \ref resetParams() or \ref reset() is used. 588 /// If the underlying digraph was also modified after the construction 589 /// of the class or the last \ref reset() call, then the \ref reset() 590 /// function must be used, otherwise \ref resetParams() is sufficient. 591 /// 592 /// See \ref resetParams() for examples. 593 /// 589 594 /// \return <tt>(*this)</tt> 595 /// 596 /// \see resetParams(), run() 590 597 CostScaling& reset() { 591 598 // Resize vectors … … 891 898 } 892 899 893 return OPTIMAL;894 }895 896 // Execute the algorithm and transform the results897 void start(Method method) {898 // Maximum path length for partial augment899 const int MAX_PATH_LENGTH = 4;900 901 900 // Initialize data structures for buckets 902 901 _max_rank = _alpha * _res_node_num; … … 906 905 _rank.resize(_res_node_num + 1); 907 906 908 // Execute the algorithm 907 return OPTIMAL; 908 } 909 910 // Execute the algorithm and transform the results 911 void start(Method method) { 912 const int MAX_PARTIAL_PATH_LENGTH = 4; 913 909 914 switch (method) { 910 915 case PUSH: … … 915 920 break; 916 921 case PARTIAL_AUGMENT: 917 startAugment(MAX_PA TH_LENGTH);922 startAugment(MAX_PARTIAL_PATH_LENGTH); 918 923 break; 919 924 } … … 952 957 LargeCost pi_u = _pi[u]; 953 958 for (int a = _first_out[u]; a != last_out; ++a) { 954 int v = _target[a]; 955 if (_res_cap[a] > 0 && _cost[a] + pi_u  _pi[v] < 0) { 956 Value delta = _res_cap[a]; 957 _excess[u] = delta; 958 _excess[v] += delta; 959 _res_cap[a] = 0; 960 _res_cap[_reverse[a]] += delta; 959 Value delta = _res_cap[a]; 960 if (delta > 0) { 961 int v = _target[a]; 962 if (_cost[a] + pi_u  _pi[v] < 0) { 963 _excess[u] = delta; 964 _excess[v] += delta; 965 _res_cap[a] = 0; 966 _res_cap[_reverse[a]] += delta; 967 } 961 968 } 962 969 } … … 1002 1009 // Global potential update heuristic 1003 1010 void globalUpdate() { 1004 int bucket_end = _root + 1;1011 const int bucket_end = _root + 1; 1005 1012 1006 1013 // Initialize buckets … … 1009 1016 } 1010 1017 Value total_excess = 0; 1018 int b0 = bucket_end; 1011 1019 for (int i = 0; i != _res_node_num; ++i) { 1012 1020 if (_excess[i] < 0) { 1013 1021 _rank[i] = 0; 1014 _bucket_next[i] = _buckets[0];1015 _bucket_prev[ _buckets[0]] = i;1016 _buckets[0]= i;1022 _bucket_next[i] = b0; 1023 _bucket_prev[b0] = i; 1024 b0 = i; 1017 1025 } else { 1018 1026 total_excess += _excess[i]; … … 1021 1029 } 1022 1030 if (total_excess == 0) return; 1031 _buckets[0] = b0; 1023 1032 1024 1033 // Search the buckets … … 1042 1051 LargeCost nrc = (_cost[ra] + _pi[v]  pi_u) / _epsilon; 1043 1052 int new_rank_v = old_rank_v; 1044 if (nrc < LargeCost(_max_rank)) 1045 new_rank_v = r + 1 + int(nrc); 1053 if (nrc < LargeCost(_max_rank)) { 1054 new_rank_v = r + 1 + static_cast<int>(nrc); 1055 } 1046 1056 1047 1057 // Change the rank of v … … 1055 1065 _buckets[old_rank_v] = _bucket_next[v]; 1056 1066 } else { 1057 _bucket_next[_bucket_prev[v]] = _bucket_next[v]; 1058 _bucket_prev[_bucket_next[v]] = _bucket_prev[v]; 1067 int pv = _bucket_prev[v], nv = _bucket_next[v]; 1068 _bucket_next[pv] = nv; 1069 _bucket_prev[nv] = pv; 1059 1070 } 1060 1071 } 1061 1072 1062 // Insert v to its new bucket 1063 _bucket_next[v] = _buckets[new_rank_v]; 1064 _bucket_prev[_buckets[new_rank_v]] = v; 1073 // Insert v into its new bucket 1074 int nv = _buckets[new_rank_v]; 1075 _bucket_next[v] = nv; 1076 _bucket_prev[nv] = v; 1065 1077 _buckets[new_rank_v] = v; 1066 1078 }
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