parameters.md

_{Utilities
Parameters
Experiment ━━ Genus ━━ Species ━━ Organism ━━ Genotype ━━ Chromosome ━━ Node}
                                                                ^{┗━━━━ Phenotype              ┗━━━━━ Link}

Parameters

Encapsulates the parameters which dictate NEATNik's functioning.

Properties

static unsigned int random_seed

A random non-negative integer used to seed NEATnik's pseudo-random number generator.
 

static int generational_cycles

Sets the number of generational cycles for which an Experiment will run.
 

static int population_size

Sets the number of Organisms to be stored in an Experiment's Genus.
 

static int mutation_attempts

Specifies the maximum number of times a Genotype should try to mutate itself when unsuccesfull in its previous attempts.
 

static int spawning_attempts

Specifies the maximum number of times a Species should try to produce an offspring Organism when unsuccesfull in its previous attempts.
 

static double weight_bound

Sets a bound on the value of Link weights. In the case of weight REPLACEMENT this corresponds to a hard bound, while in the case of weight PERTURBATION this corresponds to a soft bound.
 

static double perturbation_power

Sets the standard deviation of Link weight PERTURBATIONs.
 

static double splitting_priority

The base value used to assign Links a relative odd of being split during the creation of a new Node.
 

static node_activation initial_activation

Specifies which activation function a new HIDDEN Node is initially equipped with.
 

static double rejection_fraction

Sets the fraction of Organisms to be rejected at each generational cycle.
 

static int stagnation_threshold

Sets the number of generational cycles beyond which a Species with stagnated rank is discarded.
 

static double compatibility_threshold

Specifies the degree of similarity beyond which Organisms are separated into different Species.
 

static std::vector<double> compatibility_weights

The relative relevance assigned to matching, disjoint, and excess Links when comparing two Genotypes.
 

static std::vector<double> enabling_link

The probability mass function for toggling ENABLED a random DISABLED Link. The first element encodes the proability of failure, while the second element encodes the probability of success.
 

static std::vector<double> altering_links

The probability mass function for altering the properties of a Link. The first element encodes the proability of failure, while the second element encodes the probability of success.
 

static std::vector<double> altering_weight

The probability mass function for altering a Link's weight. The first element encodes the proability of failure, while the second and third elements encode the probabilities of altering the Link's weight through PERTURBATION or MUTATION, respectively.
 

static std::vector<double> adding_link

The probability mass function for adding a new Link to a Genotype. The first element encodes the proability of failure, while the subsequent elements encode the probabilities of adding a FORWARD, RECURRENT, BIASING, or LOOPED Link, respectively.
 

static std::vector<double> enabling_node

The probability mass function for toggling ENABLED a random DISABLED INPUT Node. The first element encodes the proability of failure. The second term encodes the probability of success while connecting the INPUT Node to a HIDDEN Node. The third term encodes the probability of success while connecting the INPUT Node to an OUTPUT Node.
 

static std::vector<double> altering_nodes

The probability mass function for altering the properties of a HIDDEN Node. The first element encodes the proability of failure, while the second element encodes the probability of success.
 

static std::vector<double> altering_activation

The probability mass function for altering a HIDDEN Node's activation. The first element encodes the proability of failure, while the subsequent elements encode the probabilities of equipping the Node with the HEAVISIDE, RELU, or LOGISTIC activation functions, respectively.
 

static std::vector<double> adding_node

The probability mass function for adding a new HIDDEN Node to a Genotype by splitting an existing Link. The first element encodes the proability of failure, while the second and third elements encode the probabilities of adding the new HIDDEN Node through the split of a FORWARD or RECURRENT Link, respectively.
 

static std::vector<double> assimilating_links

The probability mass function for attempting to assimilate the homologous Links from another Genotype. The first element encodes the proability of failure, while the second element encodes the probability of success.
 

static std::vector<double> assimilating_nodes

The probability mass function for attempting to assimilate the homologous Nodes from another Genotype. The first element encodes the proability of failure, while the second element encodes the probability of success.
 

static std::vector<double> assimilating_links

The probability mass function for assimilating a homologous Link's weight from another Genotype. The first element encodes the proability of failure, while the second element encodes the probability of success.
 

static std::vector<double> assimilating_nodes

The probability mass function for assimilating each homologous Node's activation from another Genotype. The first element encodes the proability of failure, while the second element encodes the probability of success.
 

static std::vector<double> spawning_organism

The probability mass function for a Species to spawn an offspring Organism. The first element encodes the proability of failure, while the second and third elements encode the probability of an offspring Organism being spawned through MUTATION or ASSIMILATION, respectively.
 

Constructor

Parameters()

Constructs a default Parameters instance with essentially all parameters set to zero.
 

Destructor

~Parameters()

Deletes the Parameters instance.