r934:fe283caf6414
Tue, 15 Mar 2011 17:59:57
[Not Reviewed]
0 comments (0 inline)
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| ... | ... |
@@ -575,18 +575,25 @@ |
| 575 | 575 |
return *this; |
| 576 | 576 |
} |
| 577 | 577 |
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| 578 |
/// \brief Reset all the parameters |
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| 578 |
/// \brief Reset the internal data structures and all the parameters |
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| 579 |
/// that have been given before. |
|
| 579 | 580 |
/// |
| 580 |
/// This function resets all the paramaters that have been given |
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/// before using functions \ref lowerMap(), \ref upperMap(), |
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/// |
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/// This function resets the internal data structures and all the |
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/// paramaters that have been given before using functions \ref lowerMap(), |
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/// \ref upperMap(), \ref costMap(), \ref supplyMap(), \ref stSupply(). |
|
| 583 | 584 |
/// |
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/// It is useful for multiple run() calls. If this function is not |
|
| 585 |
/// used, all the parameters given before are kept for the next |
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| 586 |
/// \ref run() call. |
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/// However, the underlying digraph must not be modified after this |
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/// |
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/// It is useful for multiple \ref run() calls. By default, all the given |
|
| 586 |
/// parameters are kept for the next \ref run() call, unless |
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| 587 |
/// \ref resetParams() or \ref reset() is used. |
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/// If the underlying digraph was also modified after the construction |
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/// of the class or the last \ref reset() call, then the \ref reset() |
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/// function must be used, otherwise \ref resetParams() is sufficient. |
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/// |
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/// See \ref resetParams() for examples. |
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/// |
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| 589 | 594 |
/// \return <tt>(*this)</tt> |
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/// |
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/// \see resetParams(), run() |
|
| 590 | 597 |
CostScaling& reset() {
|
| 591 | 598 |
// Resize vectors |
| 592 | 599 |
_node_num = countNodes(_graph); |
| ... | ... |
@@ -890,14 +897,6 @@ |
| 890 | 897 |
} |
| 891 | 898 |
} |
| 892 | 899 |
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return OPTIMAL; |
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} |
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|
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// Execute the algorithm and transform the results |
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void start(Method method) {
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|
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// Maximum path length for partial augment |
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const int MAX_PATH_LENGTH = 4; |
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| 900 |
|
|
| 901 | 900 |
// Initialize data structures for buckets |
| 902 | 901 |
_max_rank = _alpha * _res_node_num; |
| 903 | 902 |
_buckets.resize(_max_rank); |
| ... | ... |
@@ -905,7 +904,13 @@ |
| 905 | 904 |
_bucket_prev.resize(_res_node_num + 1); |
| 906 | 905 |
_rank.resize(_res_node_num + 1); |
| 907 | 906 |
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|
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return OPTIMAL; |
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} |
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|
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// Execute the algorithm and transform the results |
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void start(Method method) {
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const int MAX_PARTIAL_PATH_LENGTH = 4; |
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| 913 |
|
|
| 909 | 914 |
switch (method) {
|
| 910 | 915 |
case PUSH: |
| 911 | 916 |
startPush(); |
| ... | ... |
@@ -914,7 +919,7 @@ |
| 914 | 919 |
startAugment(_res_node_num - 1); |
| 915 | 920 |
break; |
| 916 | 921 |
case PARTIAL_AUGMENT: |
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startAugment( |
|
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startAugment(MAX_PARTIAL_PATH_LENGTH); |
|
| 918 | 923 |
break; |
| 919 | 924 |
} |
| 920 | 925 |
|
| ... | ... |
@@ -951,13 +956,15 @@ |
| 951 | 956 |
int last_out = _first_out[u+1]; |
| 952 | 957 |
LargeCost pi_u = _pi[u]; |
| 953 | 958 |
for (int a = _first_out[u]; a != last_out; ++a) {
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int v = _target[a]; |
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if (_res_cap[a] > 0 && _cost[a] + pi_u - _pi[v] < 0) {
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|
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Value delta = _res_cap[a]; |
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_excess[u] -= delta; |
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_excess[v] += delta; |
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_res_cap[a] = 0; |
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| 960 |
_res_cap |
|
| 959 |
Value delta = _res_cap[a]; |
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if (delta > 0) {
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|
| 961 |
int v = _target[a]; |
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if (_cost[a] + pi_u - _pi[v] < 0) {
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|
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_excess[u] -= delta; |
|
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_excess[v] += delta; |
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_res_cap[a] = 0; |
|
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_res_cap[_reverse[a]] += delta; |
|
| 967 |
} |
|
| 961 | 968 |
} |
| 962 | 969 |
} |
| 963 | 970 |
} |
| ... | ... |
@@ -1001,25 +1008,27 @@ |
| 1001 | 1008 |
|
| 1002 | 1009 |
// Global potential update heuristic |
| 1003 | 1010 |
void globalUpdate() {
|
| 1004 |
int bucket_end = _root + 1; |
|
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const int bucket_end = _root + 1; |
|
| 1005 | 1012 |
|
| 1006 | 1013 |
// Initialize buckets |
| 1007 | 1014 |
for (int r = 0; r != _max_rank; ++r) {
|
| 1008 | 1015 |
_buckets[r] = bucket_end; |
| 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]; |
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_bucket_prev[_buckets[0]] = i; |
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| 1016 |
|
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_bucket_next[i] = b0; |
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_bucket_prev[b0] = i; |
|
| 1024 |
b0 = i; |
|
| 1017 | 1025 |
} else {
|
| 1018 | 1026 |
total_excess += _excess[i]; |
| 1019 | 1027 |
_rank[i] = _max_rank; |
| 1020 | 1028 |
} |
| 1021 | 1029 |
} |
| 1022 | 1030 |
if (total_excess == 0) return; |
| 1031 |
_buckets[0] = b0; |
|
| 1023 | 1032 |
|
| 1024 | 1033 |
// Search the buckets |
| 1025 | 1034 |
int r = 0; |
| ... | ... |
@@ -1041,8 +1050,9 @@ |
| 1041 | 1050 |
// Compute the new rank of v |
| 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)) {
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|
| 1054 |
new_rank_v = r + 1 + static_cast<int>(nrc); |
|
| 1055 |
} |
|
| 1046 | 1056 |
|
| 1047 | 1057 |
// Change the rank of v |
| 1048 | 1058 |
if (new_rank_v < old_rank_v) {
|
| ... | ... |
@@ -1054,14 +1064,16 @@ |
| 1054 | 1064 |
if (_buckets[old_rank_v] == v) {
|
| 1055 | 1065 |
_buckets[old_rank_v] = _bucket_next[v]; |
| 1056 | 1066 |
} else {
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_bucket_next[_bucket_prev[v]] = _bucket_next[v]; |
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| 1058 |
_bucket_prev[_bucket_next[v]] = _bucket_prev[v]; |
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int pv = _bucket_prev[v], nv = _bucket_next[v]; |
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_bucket_next[pv] = nv; |
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_bucket_prev[nv] = pv; |
|
| 1059 | 1070 |
} |
| 1060 | 1071 |
} |
| 1061 | 1072 |
|
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// Insert v to its new bucket |
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_bucket_next[v] = _buckets[new_rank_v]; |
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|
|
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// Insert v into its new bucket |
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int nv = _buckets[new_rank_v]; |
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_bucket_next[v] = nv; |
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_bucket_prev[nv] = v; |
|
| 1065 | 1077 |
_buckets[new_rank_v] = v; |
| 1066 | 1078 |
} |
| 1067 | 1079 |
} |
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