chrono::ChOptimizerHybrid Class Reference
Description
Class for genetic optimization followed by a refinement with the method of gradient, one after the other.
Parameters must be set for the two encapsulated optimizers genetic_opt and gradient_opt, that is for example: my_hybrid->genetic_opt->maxgenerations = 200; etc... However, the optimization variables, the system and the objective function must be added to the hybrid optimizer itself, which in turn will automatically set them for the genetic_opt and gradient_opt.
#include <ChSolvmin.h>
Inheritance diagram for chrono::ChOptimizerHybrid:
Collaboration diagram for chrono::ChOptimizerHybrid:
Public Member Functions | |
| ChOptimizerHybrid (const ChOptimizerHybrid &other) | |
| virtual void | SetObjective (ChFx *mformula) override |
| Sets the objective function to maximize. | |
| virtual void | SetObjectiveGrad (ChFx *mformula) override |
| Sets the objective function gradient (not mandatory, because if not set, the default bacward differentiation is used). | |
| void | SetNumOfVars (int mv) override |
| Set the number of optimization variables. More... | |
| virtual bool | DoOptimize () override |
| This function computes the optimal xv[]. More... | |
 Public Member Functions inherited from chrono::ChOptimizer | |
| ChOptimizer (const ChOptimizer &other) | |
| virtual ChFx * | GetObjective () const |
| virtual ChFx * | GetObjectiveGrad () const |
| virtual int | GetNumOfVars () const |
| Returns the number of optimization variables. | |
| double * | GetXv () const |
| double * | GetXv_sup () const |
| double * | GetXv_inf () const |
| void | SetXv (double *mx) |
| void | SetXv_sup (double *mx) |
| void | SetXv_inf (double *mx) |
| double | Eval_fx (double x[]) |
| Returns the value of the functional, for given state of variables and with the given "database" multibody system. More... | |
| double | Eval_fx (const ChVectorDynamic<> &x) |
| void | Eval_grad (double x[], double gr[]) |
| Computes the gradient of objective function, for given state of variables. More... | |
| void | Eval_grad (const ChVectorDynamic<> &x, ChVectorDynamic<> &gr) |
| virtual bool | PreOptimize () |
| Performs the optimization of the ChSystem pointed by "database" (or whatever object which can evaluate the string "function" and the "optvarlist") using the current parameters. More... | |
| virtual bool | PostOptimize () |
| Finalization and cleanup. | |
| virtual bool | Optimize () |
| Does the three steps in sequence PreOptimize, DoOptimize, PostOptimize. More... | |
| void | DoBreakCheck () |
| Each break_cycles number of times this fx is called, the function break_funct() is evaluated (if any) and if positive, the variable user_break becomes true. | |
Public Attributes | |
| ChOptimizerGenetic * | genetic_opt |
| ChOptimizerLocal * | local_opt |
| int | current_phase |
| 0 = null, 1 = genetic running, 2 = local running | |
| bool | use_genetic |
| def. true; | |
| bool | use_local |
| def. true; | |
| Public Attributes inherited from chrono::ChOptimizer | |
| bool | minimize |
| default = false; just maximize | |
| double | grad_step |
| default = 1.e-12; step size for evaluation of gradient | |
| double | opt_fx |
| best resulting value of objective function | |
| char | err_message [200] |
| the ok/warning/error messages are written here | |
| int | error_code |
| long | fx_evaluations |
| number of function evaluations | |
| long | grad_evaluations |
| number of gradient evaluations | |
| int(* | break_funct )() |
| if not null, this function is called each 'break_cycles' evaluations | |
| int | break_cycles |
| how many fx evaluations per check | |
| int | user_break |
| if break_funct() reported true, this flag is ON, and optimizers should exit all cycles | |
| int | break_cyclecounter |
| internal | |
Additional Inherited Members | |
| Protected Attributes inherited from chrono::ChOptimizer | |
| ChFx * | afunction |
| the function to be maximized | |
| ChFx * | afunctionGrad |
| the gradient of the function to be maximized, or null for default BDF. | |
| int | C_vars |
| number of input variables | |
| double * | xv |
| Vector of variables, also 1st approximation. | |
| double * | xv_sup |
| These are the hi/lo limits for the variables,. | |
| double * | xv_inf |
| these are not used by all optimizer, and can be NULL for gradient, but needed for genetic. | |
Member Function Documentation
◆ DoOptimize()
|
overridevirtual |
This function computes the optimal xv[].
It must be implemented by derived classes
Reimplemented from chrono::ChOptimizer.
◆ SetNumOfVars()
|
overridevirtual |
Set the number of optimization variables.
Note: this must be set properly as the number of variables used in the objective function!
Reimplemented from chrono::ChOptimizer.
The documentation for this class was generated from the following files:
- /builds/uwsbel/chrono/src/chrono/solver/ChSolvmin.h
- /builds/uwsbel/chrono/src/chrono/solver/ChSolvmin.cpp
