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Vita
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Vita
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Ephemeral random constant. More...
#include <real.h>
Inherits vita::terminal.
Public Member Functions | |
| std::string | display (terminal_param_t v, format) const final |
| value_t | eval (symbol_params &p) const final |
| Calculates the value of / performs the action associated with the symbol (it's implementation specific). More... | |
| terminal_param_t | init () const final |
| Used to initialize the internal parameter of the terminal. More... | |
| bool | parametric () const final |
| A parametric terminal needs an additional parameter to be evaluated. More... | |
| real (const cvect &c, base_t m=-1000.0, base_t u=1000.0) | |
 Public Member Functions inherited from vita::terminal | |
| unsigned | arity () const final |
| virtual std::string | display (terminal_param_t, format=c_format) const |
| virtual terminal_param_t | init () const |
| Used to initialize the internal parameter of the terminal. More... | |
| virtual bool | parametric () const |
| A parametric terminal needs an additional parameter to be evaluated. More... | |
| symbol (const std::string &, category_t=0) | |
| Public Member Functions inherited from vita::symbol | |
| virtual unsigned | arity () const =0 |
| category_t | category () const |
| The type (a.k.a. More... | |
| void | category (category_t) |
| Changes the category of a symbol. More... | |
| virtual value_t | eval (symbol_params &) const =0 |
| Calculates the value of / performs the action associated with the symbol (it's implementation specific). More... | |
| virtual bool | input () const |
| An input variable is a feature from the learning domain. More... | |
| virtual bool | is_valid () const |
| std::string | name () const |
| opcode_t | opcode () const |
| An opcode is a unique, numerical session ID for a symbol. More... | |
| double | penalty (core_interpreter *) const |
| Used for automatic calculation of penalities due to broken constraints. More... | |
| symbol (const std::string &, category_t=0) | |
| bool | terminal () const |
Additional Inherited Members | |
| Public Types inherited from vita::symbol | |
| enum | format { c_format , cpp_format , mql_format , python_format , sup_format } |
| Symbol rendering format. More... | |
| Static Public Member Functions inherited from vita::terminal | |
| static const terminal * | cast (const symbol *) |
| This is a short cut function. More... | |
Ephemeral random constant.
It is assumed that the creation of floating-point constants is necessary to do symbolic regression in evolutionary computation. Genetic programming solves the problem of constant creation by using a special terminal named "ephemeral random constant" (Koza 1992). For each ephemeral random constant used in the initial population, a random number of a special data type in a specified range is generated. Then these random constants are moved around from genome to genome by the crossover operator.
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inlinefinalvirtual |
| [in] | v | additional informations regarding parametric symbols |
The v argument is required for parametric symbols (i.e. for a numeric terminal we have to print 123 rather than "NUMBER").
Reimplemented from vita::terminal.
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inlinefinalvirtual |
Calculates the value of / performs the action associated with the symbol (it's implementation specific).
Implements vita::symbol.
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inlinefinalvirtual |
Used to initialize the internal parameter of the terminal.
0.0Reimplemented from vita::terminal.
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inlinefinalvirtual |
A parametric terminal needs an additional parameter to be evaluated.
true for parametric symbolsGenes associated with parametric symbols store an additional parameter fetched at run-time and used for symbol evaluation.
Reimplemented from vita::terminal.
1.9.3