Date: 2021-03-03T22:27:37+00:00

Actual source code: lmvm.h
petsc-3.14.5 2021-03-03
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      3: #include <petscksp.h>
      4: #include <petsc/private/matimpl.h>
      5: #include <petsc/private/vecimpl.h>

      8: /*
      9:   MATLMVM format - a base matrix-type that represents Limited-Memory
     10:   Variable Metric (LMVM) approximations of a Jacobian.

     12:   LMVM approximations can be symmetric, symmetric positive-definite,
     13:   rectangular, or otherwise square with no determinable properties.
     14:   Each derived LMVM type should automatically set its matrix properties
     15:   if its construction can guarantee symmetry (MAT_SYMMETRIC) or symmetric
     16:   positive-definiteness (MAT_SPD).
     17: */

     19: typedef struct _MatOps_LMVM *MatOps_LMVM;
     20: struct _MatOps_LMVM {
     21:   PetscErrorCode (*update)(Mat,Vec,Vec);
     22:   PetscErrorCode (*allocate)(Mat,Vec,Vec);
     23:   PetscErrorCode (*reset)(Mat,PetscBool);
     24:   PetscErrorCode (*mult)(Mat,Vec,Vec);
     25:   PetscErrorCode (*copy)(Mat,Mat,MatStructure);
     26: };

     28: typedef struct {
     29:   /* Core data structures for stored updates */
     30:   PETSCHEADER(struct _MatOps_LMVM);
     31:   PetscBool allocated, prev_set;
     32:   PetscInt m_old, m, k, nupdates, nrejects, nresets;
     33:   Vec *S, *Y;
     34:   Vec Xprev, Fprev;

     36:   /* User-defined initial Jacobian tools */
     37:   PetscBool user_pc, user_ksp, user_scale;
     38:   PetscReal ksp_rtol, ksp_atol;
     39:   PetscInt ksp_max_it;
     40:   PetscReal J0scalar;
     41:   Vec J0diag;
     42:   Mat J0;
     43:   PC J0pc;
     44:   KSP J0ksp;

     46:   /* Data structures to support common Mat functions */
     47:   PetscReal shift;

     49:   /* Miscellenous parameters */
     50:   PetscBool square; /* flag for defining the LMVM approximation as a square matrix */
     51:   PetscReal eps; /* (default: PetscPowReal(PETSC_MACHINE_EPSILON, 2.0/3.0)) */
     52:   void *ctx; /* implementation specific context */
     53: } Mat_LMVM;

     55: /* Shared internal functions for LMVM matrices */
     56: PETSC_INTERN PetscErrorCode MatUpdateKernel_LMVM(Mat, Vec, Vec);
     57: PETSC_INTERN PetscErrorCode MatUpdate_LMVM(Mat, Vec, Vec);
     58: PETSC_INTERN PetscErrorCode MatAllocate_LMVM(Mat, Vec, Vec);
     59: PETSC_INTERN PetscErrorCode MatReset_LMVM(Mat, PetscBool);

     61: /* LMVM implementations of core Mat functionality */
     62: PETSC_INTERN PetscErrorCode MatSetFromOptions_LMVM(PetscOptionItems *PetscOptionsObject, Mat);
     63: PETSC_INTERN PetscErrorCode MatSetUp_LMVM(Mat);
     64: PETSC_INTERN PetscErrorCode MatView_LMVM(Mat, PetscViewer);
     65: PETSC_INTERN PetscErrorCode MatDestroy_LMVM(Mat);
     66: PETSC_INTERN PetscErrorCode MatCreate_LMVM(Mat);

     68: /* Create functions for derived LMVM types
     69:    NOTE: MatCreateXYZ() declarations for subtypes live under petsctao.h */
     70: PETSC_EXTERN PetscErrorCode MatCreate_LMVMDFP(Mat);
     71: PETSC_EXTERN PetscErrorCode MatCreate_LMVMBFGS(Mat);
     72: PETSC_EXTERN PetscErrorCode MatCreate_LMVMSR1(Mat);
     73: PETSC_EXTERN PetscErrorCode MatCreate_LMVMBrdn(Mat);
     74: PETSC_EXTERN PetscErrorCode MatCreate_LMVMBadBrdn(Mat);
     75: PETSC_EXTERN PetscErrorCode MatCreate_LMVMSymBrdn(Mat);
     76: PETSC_EXTERN PetscErrorCode MatCreate_LMVMSymBadBrdn(Mat);
     77: PETSC_EXTERN PetscErrorCode MatCreate_LMVMDiagBrdn(Mat);

     79: /* Solve functions for derived LMVM types (necessary only for DFP and BFGS for re-use under SymBrdn) */
     80: PETSC_INTERN PetscErrorCode MatSolve_LMVMDFP(Mat, Vec, Vec);
     81: PETSC_INTERN PetscErrorCode MatSolve_LMVMBFGS(Mat, Vec, Vec);

     83: /* Mult functions for derived LMVM types (necessary only for DFP and BFGS for re-use under SymBrdn) */
     84: PETSC_INTERN PetscErrorCode MatMult_LMVMDFP(Mat, Vec, Vec);
     85: PETSC_INTERN PetscErrorCode MatMult_LMVMBFGS(Mat, Vec, Vec);

     87: #endif