1 #include <petsctao.h> /*I "petsctao.h" I*/ 2 #include <petsc/private/taoimpl.h> 3 #include <../src/tao/matrix/submatfree.h> 4 5 /*@C 6 TaoVecGetSubVec - Gets a subvector using the IS 7 8 Input Parameters: 9 + vfull - the full matrix 10 . is - the index set for the subvector 11 . reduced_type - the method TAO is using for subsetting (TAO_SUBSET_SUBVEC, TAO_SUBSET_MASK, TAO_SUBSET_MATRIXFREE) 12 - maskvalue - the value to set the unused vector elements to (for TAO_SUBSET_MASK or TAO_SUBSET_MATRIXFREE) 13 14 Output Parameters: 15 . vreduced - the subvector 16 17 Notes: 18 maskvalue should usually be 0.0, unless a pointwise divide will be used. 19 20 @*/ 21 PetscErrorCode TaoVecGetSubVec(Vec vfull, IS is, TaoSubsetType reduced_type, PetscReal maskvalue, Vec *vreduced) 22 { 23 PetscErrorCode ierr; 24 PetscInt nfull,nreduced,nreduced_local,rlow,rhigh,flow,fhigh; 25 PetscInt i,nlocal; 26 PetscReal *fv,*rv; 27 const PetscInt *s; 28 IS ident; 29 VecType vtype; 30 VecScatter scatter; 31 MPI_Comm comm; 32 33 PetscFunctionBegin; 34 PetscValidHeaderSpecific(vfull,VEC_CLASSID,1); 35 PetscValidHeaderSpecific(is,IS_CLASSID,2); 36 37 ierr = VecGetSize(vfull, &nfull);CHKERRQ(ierr); 38 ierr = ISGetSize(is, &nreduced);CHKERRQ(ierr); 39 40 if (nreduced == nfull) { 41 ierr = VecDestroy(vreduced);CHKERRQ(ierr); 42 ierr = VecDuplicate(vfull,vreduced);CHKERRQ(ierr); 43 ierr = VecCopy(vfull,*vreduced);CHKERRQ(ierr); 44 } else { 45 switch (reduced_type) { 46 case TAO_SUBSET_SUBVEC: 47 ierr = VecGetType(vfull,&vtype);CHKERRQ(ierr); 48 ierr = VecGetOwnershipRange(vfull,&flow,&fhigh);CHKERRQ(ierr); 49 ierr = ISGetLocalSize(is,&nreduced_local);CHKERRQ(ierr); 50 ierr = PetscObjectGetComm((PetscObject)vfull,&comm);CHKERRQ(ierr); 51 if (*vreduced) { 52 ierr = VecDestroy(vreduced);CHKERRQ(ierr); 53 } 54 ierr = VecCreate(comm,vreduced);CHKERRQ(ierr); 55 ierr = VecSetType(*vreduced,vtype);CHKERRQ(ierr); 56 57 ierr = VecSetSizes(*vreduced,nreduced_local,nreduced);CHKERRQ(ierr); 58 ierr = VecGetOwnershipRange(*vreduced,&rlow,&rhigh);CHKERRQ(ierr); 59 ierr = ISCreateStride(comm,nreduced_local,rlow,1,&ident);CHKERRQ(ierr); 60 ierr = VecScatterCreate(vfull,is,*vreduced,ident,&scatter);CHKERRQ(ierr); 61 ierr = VecScatterBegin(scatter,vfull,*vreduced,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 62 ierr = VecScatterEnd(scatter,vfull,*vreduced,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 63 ierr = VecScatterDestroy(&scatter);CHKERRQ(ierr); 64 ierr = ISDestroy(&ident);CHKERRQ(ierr); 65 break; 66 67 case TAO_SUBSET_MASK: 68 case TAO_SUBSET_MATRIXFREE: 69 /* vr[i] = vf[i] if i in is 70 vr[i] = 0 otherwise */ 71 if (!*vreduced) { 72 ierr = VecDuplicate(vfull,vreduced);CHKERRQ(ierr); 73 } 74 75 ierr = VecSet(*vreduced,maskvalue);CHKERRQ(ierr); 76 ierr = ISGetLocalSize(is,&nlocal);CHKERRQ(ierr); 77 ierr = VecGetOwnershipRange(vfull,&flow,&fhigh);CHKERRQ(ierr); 78 ierr = VecGetArray(vfull,&fv);CHKERRQ(ierr); 79 ierr = VecGetArray(*vreduced,&rv);CHKERRQ(ierr); 80 ierr = ISGetIndices(is,&s);CHKERRQ(ierr); 81 if (nlocal > (fhigh-flow)) SETERRQ2(PETSC_COMM_WORLD,1,"IS local size %d > Vec local size %d",nlocal,fhigh-flow); 82 for (i=0;i<nlocal;i++) { 83 rv[s[i]-flow] = fv[s[i]-flow]; 84 } 85 ierr = ISRestoreIndices(is,&s);CHKERRQ(ierr); 86 ierr = VecRestoreArray(vfull,&fv);CHKERRQ(ierr); 87 ierr = VecRestoreArray(*vreduced,&rv);CHKERRQ(ierr); 88 break; 89 } 90 } 91 PetscFunctionReturn(0); 92 } 93 94 /*@C 95 TaoMatGetSubMat - Gets a submatrix using the IS 96 97 Input Parameters: 98 + M - the full matrix (n x n) 99 . is - the index set for the submatrix (both row and column index sets need to be the same) 100 . v1 - work vector of dimension n, needed for TAO_SUBSET_MASK option 101 - subset_type - the method TAO is using for subsetting (TAO_SUBSET_SUBVEC, TAO_SUBSET_MASK, 102 TAO_SUBSET_MATRIXFREE) 103 104 Output Parameters: 105 . Msub - the submatrix 106 @*/ 107 PetscErrorCode TaoMatGetSubMat(Mat M, IS is, Vec v1, TaoSubsetType subset_type, Mat *Msub) 108 { 109 PetscErrorCode ierr; 110 IS iscomp; 111 PetscBool flg = PETSC_FALSE; 112 113 PetscFunctionBegin; 114 PetscValidHeaderSpecific(M,MAT_CLASSID,1); 115 PetscValidHeaderSpecific(is,IS_CLASSID,2); 116 ierr = MatDestroy(Msub);CHKERRQ(ierr); 117 switch (subset_type) { 118 case TAO_SUBSET_SUBVEC: 119 ierr = MatCreateSubMatrix(M, is, is, MAT_INITIAL_MATRIX, Msub);CHKERRQ(ierr); 120 break; 121 122 case TAO_SUBSET_MASK: 123 /* Get Reduced Hessian 124 Msub[i,j] = M[i,j] if i,j in Free_Local or i==j 125 Msub[i,j] = 0 if i!=j and i or j not in Free_Local 126 */ 127 ierr = PetscOptionsBegin(PetscObjectComm((PetscObject)M),NULL,NULL,NULL);CHKERRQ(ierr); 128 ierr = PetscOptionsBool("-different_submatrix","use separate hessian matrix when computing submatrices","TaoSubsetType",flg,&flg,NULL);CHKERRQ(ierr); 129 ierr = PetscOptionsEnd();CHKERRQ(ierr); 130 if (flg) { 131 ierr = MatDuplicate(M, MAT_COPY_VALUES, Msub);CHKERRQ(ierr); 132 } else { 133 /* Act on hessian directly (default) */ 134 ierr = PetscObjectReference((PetscObject)M);CHKERRQ(ierr); 135 *Msub = M; 136 } 137 /* Save the diagonal to temporary vector */ 138 ierr = MatGetDiagonal(*Msub,v1);CHKERRQ(ierr); 139 140 /* Zero out rows and columns */ 141 ierr = ISComplementVec(is,v1,&iscomp);CHKERRQ(ierr); 142 143 /* Use v1 instead of 0 here because of PETSc bug */ 144 ierr = MatZeroRowsColumnsIS(*Msub,iscomp,1.0,v1,v1);CHKERRQ(ierr); 145 146 ierr = ISDestroy(&iscomp);CHKERRQ(ierr); 147 break; 148 case TAO_SUBSET_MATRIXFREE: 149 ierr = ISComplementVec(is,v1,&iscomp);CHKERRQ(ierr); 150 ierr = MatCreateSubMatrixFree(M,iscomp,iscomp,Msub);CHKERRQ(ierr); 151 ierr = ISDestroy(&iscomp);CHKERRQ(ierr); 152 break; 153 } 154 PetscFunctionReturn(0); 155 } 156