1 | // $Id: CbcCompareUser.cpp 1898 2013-04-09 18:06:04Z forrest $ |
---|
2 | // Copyright (C) 2004, International Business Machines |
---|
3 | // Corporation and others. All Rights Reserved. |
---|
4 | // This code is licensed under the terms of the Eclipse Public License (EPL). |
---|
5 | |
---|
6 | #include <cassert> |
---|
7 | #include <cmath> |
---|
8 | #include <cfloat> |
---|
9 | //#define CBC_DEBUG |
---|
10 | |
---|
11 | #include "CoinPragma.hpp" |
---|
12 | #include "CbcMessage.hpp" |
---|
13 | #include "CbcModel.hpp" |
---|
14 | #include "CbcTree.hpp" |
---|
15 | #include "CbcCompareUser.hpp" |
---|
16 | #include "CoinError.hpp" |
---|
17 | #include "CoinHelperFunctions.hpp" |
---|
18 | |
---|
19 | /** Default Constructor |
---|
20 | |
---|
21 | */ |
---|
22 | CbcCompareUser::CbcCompareUser () |
---|
23 | : CbcCompareBase(), |
---|
24 | weight_(-1.0), |
---|
25 | saveWeight_(0.0), |
---|
26 | numberSolutions_(0), |
---|
27 | count_(0), |
---|
28 | treeSize_(0) |
---|
29 | { |
---|
30 | test_=this; |
---|
31 | } |
---|
32 | |
---|
33 | // Constructor with weight |
---|
34 | CbcCompareUser::CbcCompareUser (double weight) |
---|
35 | : CbcCompareBase(), |
---|
36 | weight_(weight) , |
---|
37 | saveWeight_(0.0), |
---|
38 | numberSolutions_(0), |
---|
39 | count_(0), |
---|
40 | treeSize_(0) |
---|
41 | { |
---|
42 | test_=this; |
---|
43 | } |
---|
44 | |
---|
45 | |
---|
46 | // Copy constructor |
---|
47 | CbcCompareUser::CbcCompareUser ( const CbcCompareUser & rhs) |
---|
48 | :CbcCompareBase(rhs) |
---|
49 | |
---|
50 | { |
---|
51 | weight_=rhs.weight_; |
---|
52 | saveWeight_ = rhs.saveWeight_; |
---|
53 | numberSolutions_=rhs.numberSolutions_; |
---|
54 | count_ = rhs.count_; |
---|
55 | treeSize_ = rhs.treeSize_; |
---|
56 | } |
---|
57 | |
---|
58 | // Clone |
---|
59 | CbcCompareBase * |
---|
60 | CbcCompareUser::clone() const |
---|
61 | { |
---|
62 | return new CbcCompareUser(*this); |
---|
63 | } |
---|
64 | |
---|
65 | // Assignment operator |
---|
66 | CbcCompareUser & |
---|
67 | CbcCompareUser::operator=( const CbcCompareUser& rhs) |
---|
68 | { |
---|
69 | if (this!=&rhs) { |
---|
70 | CbcCompareBase::operator=(rhs); |
---|
71 | weight_=rhs.weight_; |
---|
72 | saveWeight_ = rhs.saveWeight_; |
---|
73 | numberSolutions_=rhs.numberSolutions_; |
---|
74 | count_ = rhs.count_; |
---|
75 | treeSize_ = rhs.treeSize_; |
---|
76 | } |
---|
77 | return *this; |
---|
78 | } |
---|
79 | |
---|
80 | // Destructor |
---|
81 | CbcCompareUser::~CbcCompareUser () |
---|
82 | { |
---|
83 | } |
---|
84 | // For moment go to default |
---|
85 | #if 0 |
---|
86 | // Returns true if y better than x |
---|
87 | bool |
---|
88 | CbcCompareUser::test (CbcNode * x, CbcNode * y) |
---|
89 | { |
---|
90 | if (x) { |
---|
91 | if (y) { |
---|
92 | if (weight_==-1.0) { |
---|
93 | // before solution |
---|
94 | /* printf("x %d %d %g, y %d %d %g\n", |
---|
95 | x->numberUnsatisfied(),x->depth(),x->objectiveValue(), |
---|
96 | y->numberUnsatisfied(),y->depth(),y->objectiveValue()); */ |
---|
97 | if (x->numberUnsatisfied() > y->numberUnsatisfied()) |
---|
98 | return true; |
---|
99 | else if (x->numberUnsatisfied() < y->numberUnsatisfied()) |
---|
100 | return false; |
---|
101 | else |
---|
102 | return x->depth() < y->depth(); |
---|
103 | } else { |
---|
104 | // after solution |
---|
105 | double weight = CoinMax(weight_,0.0); |
---|
106 | return x->objectiveValue()+ weight*x->numberUnsatisfied() > |
---|
107 | y->objectiveValue() + weight*y->numberUnsatisfied(); |
---|
108 | //return x->guessedObjectiveValue()>y->guessedObjectiveValue(); |
---|
109 | } |
---|
110 | } else { |
---|
111 | return false; |
---|
112 | } |
---|
113 | } else { |
---|
114 | return true; |
---|
115 | } |
---|
116 | } |
---|
117 | // This allows method to change behavior as it is called |
---|
118 | // after each solution |
---|
119 | void |
---|
120 | CbcCompareUser::newSolution(CbcModel * model, |
---|
121 | double objectiveAtContinuous, |
---|
122 | int numberInfeasibilitiesAtContinuous) |
---|
123 | { |
---|
124 | // set to get close to this solution |
---|
125 | double costPerInteger = |
---|
126 | (model->getObjValue()-objectiveAtContinuous)/ |
---|
127 | ((double) numberInfeasibilitiesAtContinuous); |
---|
128 | weight_ = 0.95*costPerInteger; |
---|
129 | saveWeight_=weight_; |
---|
130 | if (model->getSolutionCount()==model->getNumberHeuristicSolutions()) |
---|
131 | return; // solution was got by rounding |
---|
132 | numberSolutions_++; |
---|
133 | if (numberSolutions_>5) |
---|
134 | weight_ =0.0; // this searches on objective |
---|
135 | return (true) ; |
---|
136 | } |
---|
137 | // This allows method to change behavior |
---|
138 | bool |
---|
139 | CbcCompareUser::every1000Nodes(CbcModel * model, int numberNodes) |
---|
140 | { |
---|
141 | if (numberNodes>10000) |
---|
142 | weight_ =0.0; // this searches on objective |
---|
143 | else if (numberNodes==1000&&weight_==-2.0) |
---|
144 | weight_=-1.0; // Go to depth first |
---|
145 | // get size of tree |
---|
146 | treeSize_ = model->tree()->size(); |
---|
147 | if (treeSize_>10000) { |
---|
148 | // set weight to reduce size most of time |
---|
149 | if (treeSize_>20000) |
---|
150 | weight_=-1.0; |
---|
151 | else if ((numberNodes%4000)!=0) |
---|
152 | weight_=-1.0; |
---|
153 | else |
---|
154 | weight_=saveWeight_; |
---|
155 | } |
---|
156 | return numberNodes==11000; // resort if first time |
---|
157 | } |
---|
158 | // Returns true if wants code to do scan with alternate criterion |
---|
159 | bool |
---|
160 | CbcCompareUser::fullScan() const |
---|
161 | { |
---|
162 | count_++; |
---|
163 | if (weight_) |
---|
164 | return (count_%10)==0; |
---|
165 | else |
---|
166 | return false; |
---|
167 | } |
---|
168 | // This is alternate test function |
---|
169 | bool |
---|
170 | CbcCompareUser::alternateTest (CbcNode * x, CbcNode * y) |
---|
171 | { |
---|
172 | if (x) { |
---|
173 | if (y) { |
---|
174 | return x->objectiveValue() > |
---|
175 | y->objectiveValue() ; |
---|
176 | } else { |
---|
177 | return false; |
---|
178 | } |
---|
179 | } else { |
---|
180 | return true; |
---|
181 | } |
---|
182 | } |
---|
183 | #else |
---|
184 | |
---|
185 | // Returns true if y better than x |
---|
186 | bool |
---|
187 | CbcCompareUser::test (CbcNode * x, CbcNode * y) |
---|
188 | { |
---|
189 | if (weight_==-1.0&&(y->depth()>7||x->depth()>7)) { |
---|
190 | // before solution |
---|
191 | /* printf("x %d %d %g, y %d %d %g\n", |
---|
192 | x->numberUnsatisfied(),x->depth(),x->objectiveValue(), |
---|
193 | y->numberUnsatisfied(),y->depth(),y->objectiveValue()); */ |
---|
194 | if (x->numberUnsatisfied() > y->numberUnsatisfied()) { |
---|
195 | return true; |
---|
196 | } else if (x->numberUnsatisfied() < y->numberUnsatisfied()) { |
---|
197 | return false; |
---|
198 | } else { |
---|
199 | int testX = x->depth(); |
---|
200 | int testY = y->depth(); |
---|
201 | if (testX!=testY) |
---|
202 | return testX < testY; |
---|
203 | else |
---|
204 | return equalityTest(x,y); // so ties will be broken in consistent manner |
---|
205 | } |
---|
206 | } else { |
---|
207 | // after solution |
---|
208 | double weight = CoinMax(weight_,0.0); |
---|
209 | double testX = x->objectiveValue()+ weight*x->numberUnsatisfied(); |
---|
210 | double testY = y->objectiveValue() + weight*y->numberUnsatisfied(); |
---|
211 | if (testX!=testY) |
---|
212 | return testX > testY; |
---|
213 | else |
---|
214 | return equalityTest(x,y); // so ties will be broken in consistent manner |
---|
215 | } |
---|
216 | } |
---|
217 | // This allows method to change behavior as it is called |
---|
218 | // after each solution |
---|
219 | bool |
---|
220 | CbcCompareUser::newSolution(CbcModel * model, |
---|
221 | double objectiveAtContinuous, |
---|
222 | int numberInfeasibilitiesAtContinuous) |
---|
223 | { |
---|
224 | if (model->getSolutionCount()==model->getNumberHeuristicSolutions()&& |
---|
225 | model->getSolutionCount()<5&&model->getNodeCount()<500) |
---|
226 | return (false) ; // solution was got by rounding |
---|
227 | // set to get close to this solution |
---|
228 | double costPerInteger = |
---|
229 | (model->getObjValue()-objectiveAtContinuous)/ |
---|
230 | ((double) numberInfeasibilitiesAtContinuous); |
---|
231 | weight_ = 0.95*costPerInteger; |
---|
232 | saveWeight_ = 0.95*weight_; |
---|
233 | numberSolutions_++; |
---|
234 | if (numberSolutions_>5) |
---|
235 | weight_ =0.0; // this searches on objective |
---|
236 | return (true) ; |
---|
237 | } |
---|
238 | // This allows method to change behavior |
---|
239 | bool |
---|
240 | CbcCompareUser::every1000Nodes(CbcModel * model, int numberNodes) |
---|
241 | { |
---|
242 | double saveWeight=weight_; |
---|
243 | int numberNodes1000 = numberNodes/1000; |
---|
244 | if (numberNodes>10000) { |
---|
245 | weight_ =0.0; // this searches on objective |
---|
246 | // but try a bit of other stuff |
---|
247 | if ((numberNodes1000%4)==1) |
---|
248 | weight_=saveWeight_; |
---|
249 | } else if (numberNodes==1000&&weight_==-2.0) { |
---|
250 | weight_=-1.0; // Go to depth first |
---|
251 | } |
---|
252 | // get size of tree |
---|
253 | treeSize_ = model->tree()->size(); |
---|
254 | if (treeSize_>10000) { |
---|
255 | int n1 = model->solver()->getNumRows()+model->solver()->getNumCols(); |
---|
256 | int n2 = model->numberObjects(); |
---|
257 | double size = n1*0.1 + n2*2.0; |
---|
258 | // set weight to reduce size most of time |
---|
259 | if (treeSize_*size>5.0e7) |
---|
260 | weight_=-1.0; |
---|
261 | else if ((numberNodes1000%4)==0&&treeSize_*size>1.0e6) |
---|
262 | weight_=-1.0; |
---|
263 | else if ((numberNodes1000%4)==1) |
---|
264 | weight_=0.0; |
---|
265 | else |
---|
266 | weight_=saveWeight_; |
---|
267 | } |
---|
268 | return (weight_!=saveWeight); |
---|
269 | } |
---|
270 | // Returns true if wants code to do scan with alternate criterion |
---|
271 | bool |
---|
272 | CbcCompareUser::fullScan() const |
---|
273 | { |
---|
274 | return false; |
---|
275 | } |
---|
276 | // This is alternate test function |
---|
277 | bool |
---|
278 | CbcCompareUser::alternateTest (CbcNode * x, CbcNode * y) |
---|
279 | { |
---|
280 | // not used |
---|
281 | abort(); |
---|
282 | return false; |
---|
283 | } |
---|
284 | #endif |
---|