Changeset 2151
 Timestamp:
 Mar 4, 2015 10:40:35 AM (4 years ago)
 File:

 1 edited
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trunk/Cbc/src/CbcCutGenerator.cpp
r2105 r2151 616 616 const OsiRowCutDebugger * debugger = solver>getRowCutDebugger(); 617 617 #endif 618 //#define WEAKEN_CUTS 1 619 #ifdef WEAKEN_CUTS 620 const double * lower = solver>getColLower(); 621 const double * upper = solver>getColUpper(); 622 const double * solution = solver>getColSolution(); 623 #endif 618 624 for (k = numberRowCutsBefore; k < numberRowCutsAfter; k++) { 619 625 OsiRowCut * thisCut = cs.rowCutPtr(k) ; 626 #ifdef WEAKEN_CUTS 627 // weaken cut if coefficients not integer 628 629 double lb=thisCut>lb(); 630 double ub=thisCut>ub(); 631 if (lb<1.0e100ub>1.0e100) { 632 // normal cut 633 CoinPackedVector rpv = thisCut>row(); 634 const int n = rpv.getNumElements(); 635 const int * indices = rpv.getIndices(); 636 const double * elements = rpv.getElements(); 637 double bound=0.0; 638 double sum=0.0; 639 bool integral=true; 640 int nInteger=0; 641 for (int k=0; k<n; k++) { 642 double value = fabs(elements[k]); 643 int column=indices[k]; 644 sum += value; 645 if (value!=floor(value+0.5)) 646 integral=false; 647 if (solver>isInteger(column)) { 648 nInteger++; 649 double largerBound = CoinMax(fabs(lower[column]), 650 fabs(upper[column])); 651 double solutionBound=fabs(solution[column])+10.0; 652 bound += CoinMin(largerBound,solutionBound); 653 } 654 } 655 #if WEAKEN_CUTS ==1 656 // leave if all 01 657 if (nInteger==bound) 658 integral=true; 659 #endif 660 if (!integral) { 661 double weakenBy=1.0e7*(bound+sum); 662 #if WEAKEN_CUTS>2 663 weakenBy *= 10.0; 664 #endif 665 if (lb<1.0e100) 666 thisCut>setUb(ub+weakenBy); 667 else 668 thisCut>setLb(lbweakenBy); 669 } 670 } 671 #endif 620 672 #ifdef CGL_DEBUG 621 673 if (debugger && debugger>onOptimalPath(*solver)) { 674 #if CGL_DEBUG>1 675 const double * optimal = debugger>optimalSolution(); 676 CoinPackedVector rpv = thisCut>row(); 677 const int n = rpv.getNumElements(); 678 const int * indices = rpv.getIndices(); 679 const double * elements = rpv.getElements(); 680 681 double lb=thisCut>lb(); 682 double ub=thisCut>ub(); 683 double sum=0.0; 684 685 for (int k=0; k<n; k++){ 686 int column=indices[k]; 687 sum += optimal[column]*elements[k]; 688 } 689 // is it nearly violated 690 if (sum >ub  1.0e8 sum < lb + 1.0e8) { 691 double violation=CoinMax(sumub,lbsum); 692 std::cout<<generatorName_<<" cut with "<<n 693 <<" coefficients, nearly cuts off known solutions by "<<violation 694 <<", lo="<<lb<<", ub="<<ub<<std::endl; 695 for (int k=0; k<n; k++){ 696 int column=indices[k]; 697 std::cout<<"( "<<column<<" , "<<elements[k]<<" ) "; 698 if ((k%4)==3) 699 std::cout <<std::endl; 700 } 701 std::cout <<std::endl; 702 std::cout <<"Non zero solution values are"<<std::endl; 703 int j=0; 704 for (int k=0; k<n; k++){ 705 int column=indices[k]; 706 if (fabs(optimal[column])>1.0e9) { 707 std::cout<<"( "<<column<<" , "<<optimal[column]<<" ) "; 708 if ((j%4)==3) 709 std::cout <<std::endl; 710 j++; 711 } 712 } 713 std::cout <<std::endl; 714 } 715 #endif 622 716 assert(!debugger>invalidCut(*thisCut)); 623 717 if(debugger>invalidCut(*thisCut))
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