pyneat.species module¶

Divides a population into species based on genetic distance.

class pyneat.species.GenomeDistanceCache(config)[source]¶: Bases: object

class pyneat.species.Species(key, generation)[source]¶

Bases: object

Encapsulates all information about a particular species.

key¶

A unique identifier for the species.

Type:	int

created¶

The generation in which the species was created.

Type:	int

last_improved¶

The last generation where the fitness of the species improved.

Type:	int

members¶

A dictionary of {genome ID: genome} pairs for each genome in the species.

Type:	dict

representative¶

The genome that is the representative of the species, against which new genomes will be compared to see if they belong in this species.

Type:	Genome

fitness¶

The species fitness.

Type:	float

adjusted_fitness¶

The sum of the adjusted fitnesses for each genome in the species.

Type:	float

fitness_history¶

All previous fitness values. One for each generation this species has survived for.

Type:	:list:`float`

get_fitnesses()[source]¶

Get the fitnesses of each genome that belongs to this species.

Returns:	The fitness of each genome that belongs to this species.
Return type:	list

update(representative, members)[source]¶

Replace the current individuals with a new set of individuals.

Parameters:	representative (Genome) – The genome that is the new representative this species. (for) – members (dict) – A dictionary of genome ID and genome pairs of the new members of the species.

class pyneat.species.SpeciesSet(config, reporters)[source]¶

Bases: neat.config.DefaultClassConfig

Encapsulates the speciation scheme.

species_set_config¶

The speciation configuration.

Type:	DefaultClassConfig

reporters¶

The set of reporters that log events.

Type:	ReporterSet

species_key_generator¶

Keeps track of the next species ID.

Type:	generator

species¶

A dictionary of species ID, species pairs.

Type:	dict

genome_to_species¶

A dictionary of genome ID, species ID pairs.

Type:	dict

get_species(genome_key)[source]¶

Get the species to given individual belongs to.

Parameters:	genome_key (int) – The unique key of the genome to check.
Returns:	The species the individual belongs to.
Return type:	Species

get_species_id(genome_key)[source]¶

Get the species ID of the species the given individual belongs to.

Parameters:	genome_key (int) – The unique key of the genome to check.
Returns:	The key of the species the individual belongs to.
Return type:	int

classmethod parse_config(param_dict)[source]¶

Parse the speciation parameter values

Parameters:	param_dict (dict) – A dictionary of parameter values.
Returns:	The speciation configuration.
Return type:	DefaultClassConfig

speciate(config, population, generation)[source]¶

Speciate the population.

Parameters:	config (Config) – The global NEAT configuration. population (dict) – A dictionary of genome ID, genome pairs. generation (int) – The current generation.