Module neuralneat::defaults

The defaults module contains the default values of all of the constants used by the Pool to create, mutate, and mate Genomes.

Constants

• DEFAULT_AGE_SIGNIFICANCE
  The boost that younger species (10 generations or fewer) receive to their adjusted fitness scores.
• DEFAULT_CONNECTION_MUTATION_CHANCE
  The likelyhood that a connection mutation will take place whenever a Genome mutates.
• DEFAULT_CROSSOVER_CHANCE
  The likelyhood that when a Genome is mated, that it will be mated with another Genome from another Species instead of its own.
• DEFAULT_DISABLE_NODE_MUTATION_CHANCE
  The likelyhood that when a Genome mutates, it will disable an existing Gene that is enabled. Note: disable mutation will only happen if neither connection mutation nor node mutation happens.
• DEFAULT_DISJOINT_COEFFICIENT
  Used in determining whether two Genomes are the same Species
• DEFAULT_DROPOFF_AGE
  The number of generations that a Species must exist without improving its fitness before it is considered stagnant, and receives an extreme penalty to its adjusted fitness score (making it much less likely to reproduce).
• DEFAULT_ENABLE_NODE_MUTATION_CHANCE
  The likelyhood that when a Genome mutates, it will enable an existing Gene that is disabled. Note: enable mutation will only happen if neither connection mutation nor node mutation happens.
• DEFAULT_EXCESS_COEFFICIENT
  Used in determining whether two Genomes are the same Species
• DEFAULT_MATE_ONLY_RATE
  The likelyhood that when a Genome is used as the basis for the next generation via mating, that the resulting offspring will not be mated.
• DEFAULT_MUTATE_ONLY_RATE
  The likelyhood that when a Genome is used as the basis for the next generation, that it will be cloned and mutated only (rather than mated).
• DEFAULT_NODE_MUTATION_CHANCE
  The likelyhood that a new node will be added whenever a Genome mutates. Note: node mutation will only happen if a connection mutation does not. Thus, if the connection mutation chance is set to 1.0 (100% chance), this will never happen.
• DEFAULT_PERTURB_CHANCE
  The likelyhood that when a Genome mutates a weight, that it will perturb it – that is to say, randomly assign it a new value between 0.0 and 1.0.
• DEFAULT_POPULATION_SIZE
  The default number of Genomes a Pool will maintain.
• DEFAULT_SPECIES_THRESHOLD
  Used in determining whether two Genomes are the same Species
• DEFAULT_SURVIVAL_THRESHOLD
  Used in determining how many Genomes from a Species will be used as the basis for the next generation.
• DEFAULT_WEIGHT_DIFF_COEFFICIENT
  Used in determining whether two Genomes are the same Species
• DEFAULT_WEIGHT_MUTATION_CHANCE
  The likelyhood that an existing Gene will have its weights altered whenever a Genome mutates. Note: weight mutation will only happen if neither connection mutation nor node mutation happens.
• DEFAULT_WEIGHT_STEP_SIZE
  The amount of change (+ or -) that a Gene’s weight will incur when a weight mutation takes place (if it has not been perturbed).