#if !defined(PETSCTAO_H)
#define PETSCTAO_H

#include <petscsnes.h>

/* SUBMANSEC = Tao */

PETSC_EXTERN PetscErrorCode VecFischer(Vec, Vec, Vec, Vec, Vec);
PETSC_EXTERN PetscErrorCode VecSFischer(Vec, Vec, Vec, Vec, PetscReal, Vec);
PETSC_EXTERN PetscErrorCode MatDFischer(Mat, Vec, Vec, Vec, Vec, Vec, Vec, Vec, Vec);
PETSC_EXTERN PetscErrorCode MatDSFischer(Mat, Vec, Vec, Vec, Vec, PetscReal, Vec, Vec, Vec, Vec, Vec);
PETSC_EXTERN PetscErrorCode TaoSoftThreshold(Vec, PetscReal, PetscReal, Vec);

/*E
  TaoSubsetType - Type representing the way Tao handles active sets

+ `TAO_SUBSET_SUBVEC` - Tao uses `MatCreateSubMatrix()` and `VecGetSubVector()`
. `TAO_SUBSET_MASK` - Matrices are zeroed out corresponding to active set entries
- `TAO_SUBSET_MATRIXFREE` - Same as `TAO_SUBSET_MASK` but it can be applied to matrix-free operators

  Options database keys:
. -different_hessian - Tao will use a copy of the hessian operator for masking.  By default
                       Tao will directly alter the hessian operator.
  Level: intermediate

E*/
typedef enum {
  TAO_SUBSET_SUBVEC,
  TAO_SUBSET_MASK,
  TAO_SUBSET_MATRIXFREE
} TaoSubsetType;
PETSC_EXTERN const char *const TaoSubsetTypes[];

/*S
     Tao - Abstract PETSc object that manages nonlinear optimization solves

   Level: advanced

.seealso `TaoCreate()`, `TaoDestroy()`, `TaoSetType()`, `TaoType`
S*/
typedef struct _p_Tao *Tao;

/*E
     TaoADMMUpdateType - Determine spectral penalty update routine for Lagrange augmented term for `TAOADMM`.

  Level: advanced

.seealso `TaoADMMSetUpdateType()`
E*/
typedef enum {
  TAO_ADMM_UPDATE_BASIC,
  TAO_ADMM_UPDATE_ADAPTIVE,
  TAO_ADMM_UPDATE_ADAPTIVE_RELAXED
} TaoADMMUpdateType;
PETSC_EXTERN const char *const TaoADMMUpdateTypes[];

/*MC
     TAO_ADMM_UPDATE_BASIC - Use same spectral penalty set at the beginning. No update

  Level: advanced

  Note:
  Most basic implementation. Generally slower than adaptive or adaptive relaxed version.

.seealso: `TaoADMMSetUpdateType()`, `TAO_ADMM_UPDATE_ADAPTIVE`, `TAO_ADMM_UPDATE_ADAPTIVE_RELAXED`
M*/

/*MC
     TAO_ADMM_UPDATE_ADAPTIVE - Adaptively update spectral penalty

  Level: advanced

  Note:
  Adaptively updates spectral penalty by using both steepest descent and minimum gradient.

.seealso: `TaoADMMSetUpdateType()`, `TAO_ADMM_UPDATE_BASIC`, `TAO_ADMM_UPDATE_ADAPTIVE_RELAXED`
M*/

/*MC
     ADMM_UPDATE_ADAPTIVE_RELAXED - Adaptively update spectral penalty, and relaxes parameter update

  Level: advanced

  Note:
  With adaptive spectral penalty update, it also relaxes x vector update by a factor.

.seealso: `TaoADMMSetUpdateType()`, `TAO_ADMM_UPDATE_BASIC`, `TAO_ADMM_UPDATE_ADAPTIVE`
M*/

/*E
     TaoADMMRegularizerType - Determine regularizer routine - either user provided or soft threshold

  Level: advanced

.seealso `TaoADMMSetRegularizerType()`
E*/
typedef enum {
  TAO_ADMM_REGULARIZER_USER,
  TAO_ADMM_REGULARIZER_SOFT_THRESH
} TaoADMMRegularizerType;
PETSC_EXTERN const char *const TaoADMMRegularizerTypes[];

/*MC
  TAO_ADMM_REGULARIZER_USER - User provided routines for regularizer part of `TAOADMM`

  Level: advanced

  Note:
  User needs to provided appropriate routines and type for regularizer solver

.seealso: `TaoADMMSetRegularizerType()`, `TAO_ADMM_REGULARIZER_SOFT_THRESH`
M*/

/*MC
  TAO_ADMM_REGULARIZER_SOFT_THRESH - Soft threshold to solve regularizer part of `TAOADMM`

  Level: advanced

  Note:
  Utilizes built-in SoftThreshold routines

.seealso: `TaoSoftThreshold()`, `TaoADMMSetRegularizerObjectiveAndGradientRoutine()`,
          `TaoADMMSetRegularizerHessianRoutine()`, `TaoADMMSetRegularizerType()`, `TAO_ADMM_REGULARIZER_USER`
M*/

/*E
     TaoALMMType - Determine the augmented Lagrangian formulation used in the `TAOALMM` subproblem.

$  `TAO_ALMM_CLASSIC` - classic augmented Lagrangian definition including slack variables for inequality constraints
$  `TAO_ALMM_PHR`     - Powell-Hestenes-Rockafellar formulation without slack variables, uses pointwise min() for inequalities

  Level: advanced

.seealso `TAOALMM`, `TaoALMMSetType()`, `TaoALMMGetType()`
E*/
typedef enum {
  TAO_ALMM_CLASSIC,
  TAO_ALMM_PHR
} TaoALMMType;
PETSC_EXTERN const char *const TaoALMMTypes[];

/*J
        TaoType - String with the name of a `Tao` method

       Level: beginner

.seealso `Tao`, `TaoCreate()`, `TaoSetType()`
J*/
typedef const char *TaoType;
#define TAOLMVM     "lmvm"
#define TAONLS      "nls"
#define TAONTR      "ntr"
#define TAONTL      "ntl"
#define TAOCG       "cg"
#define TAOTRON     "tron"
#define TAOOWLQN    "owlqn"
#define TAOBMRM     "bmrm"
#define TAOBLMVM    "blmvm"
#define TAOBQNLS    "bqnls"
#define TAOBNCG     "bncg"
#define TAOBNLS     "bnls"
#define TAOBNTR     "bntr"
#define TAOBNTL     "bntl"
#define TAOBQNKLS   "bqnkls"
#define TAOBQNKTR   "bqnktr"
#define TAOBQNKTL   "bqnktl"
#define TAOBQPIP    "bqpip"
#define TAOGPCG     "gpcg"
#define TAONM       "nm"
#define TAOPOUNDERS "pounders"
#define TAOBRGN     "brgn"
#define TAOLCL      "lcl"
#define TAOSSILS    "ssils"
#define TAOSSFLS    "ssfls"
#define TAOASILS    "asils"
#define TAOASFLS    "asfls"
#define TAOIPM      "ipm"
#define TAOPDIPM    "pdipm"
#define TAOSHELL    "shell"
#define TAOADMM     "admm"
#define TAOALMM     "almm"
#define TAOPYTHON   "python"

PETSC_EXTERN PetscClassId      TAO_CLASSID;
PETSC_EXTERN PetscFunctionList TaoList;

/*E
    TaoConvergedReason - reason a Tao method was said to have converged or diverged

   Level: beginner

   The two most common reasons for divergence are
$   1) an incorrectly coded or computed gradient or Hessian
$   2) failure or lack of convergence in the linear system (in this case we recommend
$      testing with -pc_type lu to eliminate the linear solver as the cause of the problem).

   Developer Notes:
    This must match petsc/finclude/petsctao.h

       The string versions of these are in `TAOConvergedReasons`, if you change any value here you must
     also adjust that array.

.seealso: `Tao`, `TaoSolve()`, `TaoGetConvergedReason()`, `KSPConvergedReason`, `SNESConvergedReason`, `TSConvergedReason`
E*/
typedef enum {                   /* converged */
  TAO_CONVERGED_GATOL       = 3, /* ||g(X)|| < gatol */
  TAO_CONVERGED_GRTOL       = 4, /* ||g(X)|| / f(X)  < grtol */
  TAO_CONVERGED_GTTOL       = 5, /* ||g(X)|| / ||g(X0)|| < gttol */
  TAO_CONVERGED_STEPTOL     = 6, /* step size small */
  TAO_CONVERGED_MINF        = 7, /* F < F_min */
  TAO_CONVERGED_USER        = 8, /* User defined */
  /* diverged */
  TAO_DIVERGED_MAXITS       = -2,
  TAO_DIVERGED_NAN          = -4,
  TAO_DIVERGED_MAXFCN       = -5,
  TAO_DIVERGED_LS_FAILURE   = -6,
  TAO_DIVERGED_TR_REDUCTION = -7,
  TAO_DIVERGED_USER         = -8, /* User defined */
  /* keep going */
  TAO_CONTINUE_ITERATING    = 0
} TaoConvergedReason;

PETSC_EXTERN const char **TaoConvergedReasons;

PETSC_EXTERN PetscErrorCode TaoInitializePackage(void);
PETSC_EXTERN PetscErrorCode TaoFinalizePackage(void);
PETSC_EXTERN PetscErrorCode TaoCreate(MPI_Comm, Tao *);
PETSC_EXTERN PetscErrorCode TaoSetFromOptions(Tao);
PETSC_EXTERN PetscErrorCode TaoSetUp(Tao);
PETSC_EXTERN PetscErrorCode TaoSetType(Tao, TaoType);
PETSC_EXTERN PetscErrorCode TaoGetType(Tao, TaoType *);
PETSC_EXTERN PetscErrorCode TaoSetApplicationContext(Tao, void *);
PETSC_EXTERN PetscErrorCode TaoGetApplicationContext(Tao, void *);
PETSC_EXTERN PetscErrorCode TaoDestroy(Tao *);

PETSC_EXTERN PetscErrorCode TaoSetOptionsPrefix(Tao, const char[]);
PETSC_EXTERN PetscErrorCode TaoView(Tao, PetscViewer);
PETSC_EXTERN PetscErrorCode TaoViewFromOptions(Tao, PetscObject, const char[]);

PETSC_EXTERN PetscErrorCode TaoSolve(Tao);

PETSC_EXTERN PetscErrorCode TaoRegister(const char[], PetscErrorCode (*)(Tao));
PETSC_EXTERN PetscErrorCode TaoRegisterDestroy(void);

PETSC_EXTERN PetscErrorCode TaoGetConvergedReason(Tao, TaoConvergedReason *);
PETSC_EXTERN PetscErrorCode TaoGetSolutionStatus(Tao, PetscInt *, PetscReal *, PetscReal *, PetscReal *, PetscReal *, TaoConvergedReason *);
PETSC_EXTERN PetscErrorCode TaoSetConvergedReason(Tao, TaoConvergedReason);
PETSC_EXTERN PetscErrorCode TaoSetSolution(Tao, Vec);
PETSC_EXTERN PetscErrorCode TaoGetSolution(Tao, Vec *);
PETSC_DEPRECATED_FUNCTION("Use TaoSetSolution() (since version 3.17)") static inline PetscErrorCode TaoSetInitialVector(Tao t, Vec v) {
  return TaoSetSolution(t, v);
}
PETSC_DEPRECATED_FUNCTION("Use TaoGetSolution() (since version 3.17)") static inline PetscErrorCode TaoGetInitialVector(Tao t, Vec *v) {
  return TaoGetSolution(t, v);
}

PETSC_EXTERN PetscErrorCode TaoSetObjective(Tao, PetscErrorCode (*)(Tao, Vec, PetscReal *, void *), void *);
PETSC_EXTERN PetscErrorCode TaoGetObjective(Tao, PetscErrorCode (**)(Tao, Vec, PetscReal *, void *), void **);
PETSC_EXTERN PetscErrorCode TaoSetGradient(Tao, Vec, PetscErrorCode (*)(Tao, Vec, Vec, void *), void *);
PETSC_EXTERN PetscErrorCode TaoGetGradient(Tao, Vec *, PetscErrorCode (**)(Tao, Vec, Vec, void *), void **);
PETSC_EXTERN PetscErrorCode TaoSetObjectiveAndGradient(Tao, Vec, PetscErrorCode (*)(Tao, Vec, PetscReal *, Vec, void *), void *);
PETSC_EXTERN PetscErrorCode TaoGetObjectiveAndGradient(Tao, Vec *, PetscErrorCode (**)(Tao, Vec, PetscReal *, Vec, void *), void **);
PETSC_EXTERN PetscErrorCode TaoSetHessian(Tao, Mat, Mat, PetscErrorCode (*)(Tao, Vec, Mat, Mat, void *), void *);
PETSC_EXTERN PetscErrorCode TaoGetHessian(Tao, Mat *, Mat *, PetscErrorCode (**)(Tao, Vec, Mat, Mat, void *), void **);
PETSC_DEPRECATED_FUNCTION("Use TaoSetObjective() (since version 3.17)") static inline PetscErrorCode TaoSetObjectiveRoutine(Tao t, PetscErrorCode (*f)(Tao, Vec, PetscReal *, void *), void *c) {
  return TaoSetObjective(t, f, c);
}
PETSC_DEPRECATED_FUNCTION("Use TaoGetGradient() (since version 3.17)") static inline PetscErrorCode TaoGetGradientVector(Tao t, Vec *v) {
  return TaoGetGradient(t, v, NULL, NULL);
}
PETSC_DEPRECATED_FUNCTION("Use TaoSetGradient() (since version 3.17)") static inline PetscErrorCode TaoSetGradientRoutine(Tao t, PetscErrorCode (*f)(Tao, Vec, Vec, void *), void *c) {
  return TaoSetGradient(t, NULL, f, c);
}
PETSC_DEPRECATED_FUNCTION("Use TaoSetObjectiveAndGradient() (since version 3.17)") static inline PetscErrorCode TaoSetObjectiveAndGradientRoutine(Tao t, PetscErrorCode (*f)(Tao, Vec, PetscReal *, Vec, void *), void *c) {
  return TaoSetObjectiveAndGradient(t, NULL, f, c);
}
PETSC_DEPRECATED_FUNCTION("Use TaoSetHessian() (since version 3.17)") static inline PetscErrorCode TaoSetHessianRoutine(Tao t, Mat H, Mat P, PetscErrorCode (*f)(Tao, Vec, Mat, Mat, void *), void *c) {
  return TaoSetHessian(t, H, P, f, c);
}

PETSC_EXTERN PetscErrorCode TaoSetGradientNorm(Tao, Mat);
PETSC_EXTERN PetscErrorCode TaoGetGradientNorm(Tao, Mat *);
PETSC_EXTERN PetscErrorCode TaoSetLMVMMatrix(Tao, Mat);
PETSC_EXTERN PetscErrorCode TaoGetLMVMMatrix(Tao, Mat *);
PETSC_EXTERN PetscErrorCode TaoSetRecycleHistory(Tao, PetscBool);
PETSC_EXTERN PetscErrorCode TaoGetRecycleHistory(Tao, PetscBool *);
PETSC_EXTERN PetscErrorCode TaoLMVMSetH0(Tao, Mat);
PETSC_EXTERN PetscErrorCode TaoLMVMGetH0(Tao, Mat *);
PETSC_EXTERN PetscErrorCode TaoLMVMGetH0KSP(Tao, KSP *);
PETSC_EXTERN PetscErrorCode TaoLMVMRecycle(Tao, PetscBool);
PETSC_EXTERN PetscErrorCode TaoSetResidualRoutine(Tao, Vec, PetscErrorCode (*)(Tao, Vec, Vec, void *), void *);
PETSC_EXTERN PetscErrorCode TaoSetResidualWeights(Tao, Vec, PetscInt, PetscInt *, PetscInt *, PetscReal *);
PETSC_EXTERN PetscErrorCode TaoSetConstraintsRoutine(Tao, Vec, PetscErrorCode (*)(Tao, Vec, Vec, void *), void *);
PETSC_EXTERN PetscErrorCode TaoSetInequalityConstraintsRoutine(Tao, Vec, PetscErrorCode (*)(Tao, Vec, Vec, void *), void *);
PETSC_EXTERN PetscErrorCode TaoSetEqualityConstraintsRoutine(Tao, Vec, PetscErrorCode (*)(Tao, Vec, Vec, void *), void *);
PETSC_EXTERN PetscErrorCode TaoSetJacobianResidualRoutine(Tao, Mat, Mat, PetscErrorCode (*)(Tao, Vec, Mat, Mat, void *), void *);
PETSC_EXTERN PetscErrorCode TaoSetJacobianRoutine(Tao, Mat, Mat, PetscErrorCode (*)(Tao, Vec, Mat, Mat, void *), void *);
PETSC_EXTERN PetscErrorCode TaoSetJacobianStateRoutine(Tao, Mat, Mat, Mat, PetscErrorCode (*)(Tao, Vec, Mat, Mat, Mat, void *), void *);
PETSC_EXTERN PetscErrorCode TaoSetJacobianDesignRoutine(Tao, Mat, PetscErrorCode (*)(Tao, Vec, Mat, void *), void *);
PETSC_EXTERN PetscErrorCode TaoSetJacobianInequalityRoutine(Tao, Mat, Mat, PetscErrorCode (*)(Tao, Vec, Mat, Mat, void *), void *);
PETSC_EXTERN PetscErrorCode TaoSetJacobianEqualityRoutine(Tao, Mat, Mat, PetscErrorCode (*)(Tao, Vec, Mat, Mat, void *), void *);

PETSC_EXTERN PetscErrorCode TaoPythonSetType(Tao, const char[]);
PETSC_EXTERN PetscErrorCode TaoPythonGetType(Tao, const char *[]);

PETSC_EXTERN PetscErrorCode TaoShellSetSolve(Tao, PetscErrorCode (*)(Tao));
PETSC_EXTERN PetscErrorCode TaoShellSetContext(Tao, void *);
PETSC_EXTERN PetscErrorCode TaoShellGetContext(Tao, void *);

PETSC_DEPRECATED_FUNCTION("Use TaoSetResidualRoutine() (since version 3.11)") static inline PetscErrorCode TaoSetSeparableObjectiveRoutine(Tao tao, Vec res, PetscErrorCode (*func)(Tao, Vec, Vec, void *), void *ctx) {
  return TaoSetResidualRoutine(tao, res, func, ctx);
}
PETSC_DEPRECATED_FUNCTION("Use TaoSetResidualWeights() (since version 3.11)") static inline PetscErrorCode TaoSetSeparableObjectiveWeights(Tao tao, Vec sigma_v, PetscInt n, PetscInt *rows, PetscInt *cols, PetscReal *vals) {
  return TaoSetResidualWeights(tao, sigma_v, n, rows, cols, vals);
}

PETSC_EXTERN PetscErrorCode TaoSetStateDesignIS(Tao, IS, IS);

PETSC_EXTERN PetscErrorCode TaoComputeObjective(Tao, Vec, PetscReal *);
PETSC_EXTERN PetscErrorCode TaoComputeResidual(Tao, Vec, Vec);
PETSC_EXTERN PetscErrorCode TaoTestGradient(Tao, Vec, Vec);
PETSC_EXTERN PetscErrorCode TaoComputeGradient(Tao, Vec, Vec);
PETSC_EXTERN PetscErrorCode TaoComputeObjectiveAndGradient(Tao, Vec, PetscReal *, Vec);
PETSC_EXTERN PetscErrorCode TaoComputeConstraints(Tao, Vec, Vec);
PETSC_EXTERN PetscErrorCode TaoComputeInequalityConstraints(Tao, Vec, Vec);
PETSC_EXTERN PetscErrorCode TaoComputeEqualityConstraints(Tao, Vec, Vec);
PETSC_EXTERN PetscErrorCode TaoDefaultComputeGradient(Tao, Vec, Vec, void *);
PETSC_EXTERN PetscErrorCode TaoIsObjectiveDefined(Tao, PetscBool *);
PETSC_EXTERN PetscErrorCode TaoIsGradientDefined(Tao, PetscBool *);
PETSC_EXTERN PetscErrorCode TaoIsObjectiveAndGradientDefined(Tao, PetscBool *);

PETSC_DEPRECATED_FUNCTION("Use TaoComputeResidual() (since version 3.11)") static inline PetscErrorCode TaoComputeSeparableObjective(Tao tao, Vec X, Vec F) {
  return TaoComputeResidual(tao, X, F);
}

PETSC_EXTERN PetscErrorCode TaoTestHessian(Tao);
PETSC_EXTERN PetscErrorCode TaoComputeHessian(Tao, Vec, Mat, Mat);
PETSC_EXTERN PetscErrorCode TaoComputeResidualJacobian(Tao, Vec, Mat, Mat);
PETSC_EXTERN PetscErrorCode TaoComputeJacobian(Tao, Vec, Mat, Mat);
PETSC_EXTERN PetscErrorCode TaoComputeJacobianState(Tao, Vec, Mat, Mat, Mat);
PETSC_EXTERN PetscErrorCode TaoComputeJacobianEquality(Tao, Vec, Mat, Mat);
PETSC_EXTERN PetscErrorCode TaoComputeJacobianInequality(Tao, Vec, Mat, Mat);
PETSC_EXTERN PetscErrorCode TaoComputeJacobianDesign(Tao, Vec, Mat);

PETSC_EXTERN PetscErrorCode TaoDefaultComputeHessian(Tao, Vec, Mat, Mat, void *);
PETSC_EXTERN PetscErrorCode TaoDefaultComputeHessianColor(Tao, Vec, Mat, Mat, void *);
PETSC_EXTERN PetscErrorCode TaoDefaultComputeHessianMFFD(Tao, Vec, Mat, Mat, void *);
PETSC_EXTERN PetscErrorCode TaoComputeDualVariables(Tao, Vec, Vec);
PETSC_EXTERN PetscErrorCode TaoSetVariableBounds(Tao, Vec, Vec);
PETSC_EXTERN PetscErrorCode TaoGetVariableBounds(Tao, Vec *, Vec *);
PETSC_EXTERN PetscErrorCode TaoGetDualVariables(Tao, Vec *, Vec *);
PETSC_EXTERN PetscErrorCode TaoSetInequalityBounds(Tao, Vec, Vec);
PETSC_EXTERN PetscErrorCode TaoGetInequalityBounds(Tao, Vec *, Vec *);
PETSC_EXTERN PetscErrorCode TaoSetVariableBoundsRoutine(Tao, PetscErrorCode (*)(Tao, Vec, Vec, void *), void *);
PETSC_EXTERN PetscErrorCode TaoComputeVariableBounds(Tao);

PETSC_EXTERN PetscErrorCode TaoGetTolerances(Tao, PetscReal *, PetscReal *, PetscReal *);
PETSC_EXTERN PetscErrorCode TaoSetTolerances(Tao, PetscReal, PetscReal, PetscReal);
PETSC_EXTERN PetscErrorCode TaoGetConstraintTolerances(Tao, PetscReal *, PetscReal *);
PETSC_EXTERN PetscErrorCode TaoSetConstraintTolerances(Tao, PetscReal, PetscReal);
PETSC_EXTERN PetscErrorCode TaoSetFunctionLowerBound(Tao, PetscReal);
PETSC_EXTERN PetscErrorCode TaoSetInitialTrustRegionRadius(Tao, PetscReal);
PETSC_EXTERN PetscErrorCode TaoSetMaximumIterations(Tao, PetscInt);
PETSC_EXTERN PetscErrorCode TaoSetMaximumFunctionEvaluations(Tao, PetscInt);
PETSC_EXTERN PetscErrorCode TaoGetFunctionLowerBound(Tao, PetscReal *);
PETSC_EXTERN PetscErrorCode TaoGetInitialTrustRegionRadius(Tao, PetscReal *);
PETSC_EXTERN PetscErrorCode TaoGetCurrentTrustRegionRadius(Tao, PetscReal *);
PETSC_EXTERN PetscErrorCode TaoGetMaximumIterations(Tao, PetscInt *);
PETSC_EXTERN PetscErrorCode TaoGetCurrentFunctionEvaluations(Tao, PetscInt *);
PETSC_EXTERN PetscErrorCode TaoGetMaximumFunctionEvaluations(Tao, PetscInt *);
PETSC_EXTERN PetscErrorCode TaoGetIterationNumber(Tao, PetscInt *);
PETSC_EXTERN PetscErrorCode TaoSetIterationNumber(Tao, PetscInt);
PETSC_EXTERN PetscErrorCode TaoGetTotalIterationNumber(Tao, PetscInt *);
PETSC_EXTERN PetscErrorCode TaoSetTotalIterationNumber(Tao, PetscInt);
PETSC_EXTERN PetscErrorCode TaoGetResidualNorm(Tao, PetscReal *);

PETSC_EXTERN PetscErrorCode TaoAppendOptionsPrefix(Tao, const char[]);
PETSC_EXTERN PetscErrorCode TaoGetOptionsPrefix(Tao, const char *[]);
PETSC_EXTERN PetscErrorCode TaoResetStatistics(Tao);
PETSC_EXTERN PetscErrorCode TaoSetUpdate(Tao, PetscErrorCode (*)(Tao, PetscInt, void *), void *);

PETSC_EXTERN PetscErrorCode TaoGetKSP(Tao, KSP *);
PETSC_EXTERN PetscErrorCode TaoGetLinearSolveIterations(Tao, PetscInt *);
PETSC_EXTERN PetscErrorCode TaoKSPSetUseEW(Tao, PetscBool);

#include <petsctaolinesearch.h>

PETSC_EXTERN PetscErrorCode TaoGetLineSearch(Tao, TaoLineSearch *);

PETSC_EXTERN PetscErrorCode TaoSetConvergenceHistory(Tao, PetscReal *, PetscReal *, PetscReal *, PetscInt *, PetscInt, PetscBool);
PETSC_EXTERN PetscErrorCode TaoGetConvergenceHistory(Tao, PetscReal **, PetscReal **, PetscReal **, PetscInt **, PetscInt *);
PETSC_EXTERN PetscErrorCode TaoSetMonitor(Tao, PetscErrorCode (*)(Tao, void *), void *, PetscErrorCode (*)(void **));
PETSC_EXTERN PetscErrorCode TaoCancelMonitors(Tao);
PETSC_EXTERN PetscErrorCode TaoMonitorDefault(Tao, void *);
PETSC_DEPRECATED_FUNCTION("Use TaoMonitorDefault() (since version 3.9)") static inline PetscErrorCode TaoDefaultMonitor(Tao tao, void *ctx) {
  return TaoMonitorDefault(tao, ctx);
}
PETSC_EXTERN PetscErrorCode TaoDefaultGMonitor(Tao, void *);
PETSC_EXTERN PetscErrorCode TaoDefaultSMonitor(Tao, void *);
PETSC_EXTERN PetscErrorCode TaoDefaultCMonitor(Tao, void *);
PETSC_EXTERN PetscErrorCode TaoSolutionMonitor(Tao, void *);
PETSC_EXTERN PetscErrorCode TaoResidualMonitor(Tao, void *);
PETSC_EXTERN PetscErrorCode TaoGradientMonitor(Tao, void *);
PETSC_EXTERN PetscErrorCode TaoStepDirectionMonitor(Tao, void *);
PETSC_EXTERN PetscErrorCode TaoDrawSolutionMonitor(Tao, void *);
PETSC_EXTERN PetscErrorCode TaoDrawStepMonitor(Tao, void *);
PETSC_EXTERN PetscErrorCode TaoDrawGradientMonitor(Tao, void *);
PETSC_EXTERN PetscErrorCode TaoAddLineSearchCounts(Tao);

PETSC_EXTERN PetscErrorCode TaoDefaultConvergenceTest(Tao, void *);
PETSC_EXTERN PetscErrorCode TaoSetConvergenceTest(Tao, PetscErrorCode (*)(Tao, void *), void *);

PETSC_EXTERN PetscErrorCode          TaoLCLSetStateDesignIS(Tao, IS, IS);
PETSC_EXTERN PetscErrorCode          TaoMonitor(Tao, PetscInt, PetscReal, PetscReal, PetscReal, PetscReal);
typedef struct _n_TaoMonitorDrawCtx *TaoMonitorDrawCtx;
PETSC_EXTERN PetscErrorCode          TaoMonitorDrawCtxCreate(MPI_Comm, const char[], const char[], int, int, int, int, PetscInt, TaoMonitorDrawCtx *);
PETSC_EXTERN PetscErrorCode          TaoMonitorDrawCtxDestroy(TaoMonitorDrawCtx *);

PETSC_EXTERN PetscErrorCode TaoBRGNGetSubsolver(Tao, Tao *);
PETSC_EXTERN PetscErrorCode TaoBRGNSetRegularizerObjectiveAndGradientRoutine(Tao, PetscErrorCode (*)(Tao, Vec, PetscReal *, Vec, void *), void *);
PETSC_EXTERN PetscErrorCode TaoBRGNSetRegularizerHessianRoutine(Tao, Mat, PetscErrorCode (*)(Tao, Vec, Mat, void *), void *);
PETSC_EXTERN PetscErrorCode TaoBRGNSetRegularizerWeight(Tao, PetscReal);
PETSC_EXTERN PetscErrorCode TaoBRGNSetL1SmoothEpsilon(Tao, PetscReal);
PETSC_EXTERN PetscErrorCode TaoBRGNSetDictionaryMatrix(Tao, Mat);
PETSC_EXTERN PetscErrorCode TaoBRGNGetDampingVector(Tao, Vec *);

PETSC_EXTERN PetscErrorCode TaoADMMGetMisfitSubsolver(Tao, Tao *);
PETSC_EXTERN PetscErrorCode TaoADMMGetRegularizationSubsolver(Tao, Tao *);
PETSC_EXTERN PetscErrorCode TaoADMMGetDualVector(Tao, Vec *);
PETSC_EXTERN PetscErrorCode TaoADMMGetSpectralPenalty(Tao, PetscReal *);
PETSC_EXTERN PetscErrorCode TaoADMMSetSpectralPenalty(Tao, PetscReal);
PETSC_EXTERN PetscErrorCode TaoGetADMMParentTao(Tao, Tao *);
PETSC_EXTERN PetscErrorCode TaoADMMSetConstraintVectorRHS(Tao, Vec);
PETSC_EXTERN PetscErrorCode TaoADMMSetRegularizerCoefficient(Tao, PetscReal);
PETSC_EXTERN PetscErrorCode TaoADMMSetMisfitConstraintJacobian(Tao, Mat, Mat, PetscErrorCode (*)(Tao, Vec, Mat, Mat, void *), void *);
PETSC_EXTERN PetscErrorCode TaoADMMSetRegularizerConstraintJacobian(Tao, Mat, Mat, PetscErrorCode (*)(Tao, Vec, Mat, Mat, void *), void *);
PETSC_EXTERN PetscErrorCode TaoADMMSetRegularizerHessianRoutine(Tao, Mat, Mat, PetscErrorCode (*)(Tao, Vec, Mat, Mat, void *), void *);
PETSC_EXTERN PetscErrorCode TaoADMMSetRegularizerObjectiveAndGradientRoutine(Tao, PetscErrorCode (*)(Tao, Vec, PetscReal *, Vec, void *), void *);
PETSC_EXTERN PetscErrorCode TaoADMMSetMisfitHessianRoutine(Tao, Mat, Mat, PetscErrorCode (*)(Tao, Vec, Mat, Mat, void *), void *);
PETSC_EXTERN PetscErrorCode TaoADMMSetMisfitObjectiveAndGradientRoutine(Tao, PetscErrorCode (*)(Tao, Vec, PetscReal *, Vec, void *), void *);
PETSC_EXTERN PetscErrorCode TaoADMMSetMisfitHessianChangeStatus(Tao, PetscBool);
PETSC_EXTERN PetscErrorCode TaoADMMSetRegHessianChangeStatus(Tao, PetscBool);
PETSC_EXTERN PetscErrorCode TaoADMMSetMinimumSpectralPenalty(Tao, PetscReal);
PETSC_EXTERN PetscErrorCode TaoADMMSetRegularizerType(Tao, TaoADMMRegularizerType);
PETSC_EXTERN PetscErrorCode TaoADMMGetRegularizerType(Tao, TaoADMMRegularizerType *);
PETSC_EXTERN PetscErrorCode TaoADMMSetUpdateType(Tao, TaoADMMUpdateType);
PETSC_EXTERN PetscErrorCode TaoADMMGetUpdateType(Tao, TaoADMMUpdateType *);

PETSC_EXTERN PetscErrorCode TaoALMMGetType(Tao, TaoALMMType *);
PETSC_EXTERN PetscErrorCode TaoALMMSetType(Tao, TaoALMMType);
PETSC_EXTERN PetscErrorCode TaoALMMGetSubsolver(Tao, Tao *);
PETSC_EXTERN PetscErrorCode TaoALMMSetSubsolver(Tao, Tao);
PETSC_EXTERN PetscErrorCode TaoALMMGetMultipliers(Tao, Vec *);
PETSC_EXTERN PetscErrorCode TaoALMMSetMultipliers(Tao, Vec);
PETSC_EXTERN PetscErrorCode TaoALMMGetPrimalIS(Tao, IS *, IS *);
PETSC_EXTERN PetscErrorCode TaoALMMGetDualIS(Tao, IS *, IS *);
#endif