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hyper neat

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This commit is contained in:
wls2002
2023-07-24 19:25:02 +08:00
parent ac295c1921
commit ebad574431
24 changed files with 542 additions and 103 deletions
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1
algorithm/neat/species/__init__.py
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@@ -1 +1,2 @@
from .operations import update_species, create_speciate
from .species_info import SpeciesInfo

82
algorithm/neat/species/operations.py
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@@ -6,6 +6,7 @@ from jax import numpy as jnp, vmap
from core import Gene, Genome
from utils import rank_elements, fetch_first
from .distance import create_distance
from .species_info import SpeciesInfo
def update_species(state, randkey, fitness):
@@ -18,15 +19,9 @@ def update_species(state, randkey, fitness):
# sort species_info by their fitness. (push nan to the end)
sort_indices = jnp.argsort(species_fitness)[::-1]
center_nodes = state.center_genomes.nodes[sort_indices]
center_conns = state.center_genomes.conns[sort_indices]
state = state.update(
species_keys=state.species_keys[sort_indices],
best_fitness=state.best_fitness[sort_indices],
last_improved=state.last_improved[sort_indices],
member_count=state.member_count[sort_indices],
center_genomes=Genome(center_nodes, center_conns),
species_info=state.species_info[sort_indices],
center_genomes=state.center_genomes[sort_indices],
)
# decide the number of members of each species by their fitness
@@ -45,11 +40,11 @@ def update_species_fitness(state, fitness):
"""
def aux_func(idx):
s_fitness = jnp.where(state.idx2species == state.species_keys[idx], fitness, -jnp.inf)
s_fitness = jnp.where(state.idx2species == state.species_info.species_keys[idx], fitness, -jnp.inf)
f = jnp.max(s_fitness)
return f
return vmap(aux_func)(jnp.arange(state.species_keys.shape[0]))
return vmap(aux_func)(jnp.arange(state.species_info.size()))
def stagnation(state, species_fitness):
@@ -61,7 +56,7 @@ def stagnation(state, species_fitness):
def aux_func(idx):
s_fitness = species_fitness[idx]
sk, bf, li = state.species_keys[idx], state.best_fitness[idx], state.last_improved[idx]
sk, bf, li, _ = state.species_info.get(idx)
st = (s_fitness <= bf) & (state.generation - li > state.max_stagnation)
li = jnp.where(s_fitness > bf, state.generation, li)
bf = jnp.where(s_fitness > bf, s_fitness, bf)
@@ -78,18 +73,19 @@ def stagnation(state, species_fitness):
species_keys = jnp.where(spe_st, jnp.nan, species_keys)
best_fitness = jnp.where(spe_st, jnp.nan, best_fitness)
last_improved = jnp.where(spe_st, jnp.nan, last_improved)
member_count = jnp.where(spe_st, jnp.nan, state.member_count)
member_count = jnp.where(spe_st, jnp.nan, state.species_info.member_count)
species_fitness = jnp.where(spe_st, -jnp.inf, species_fitness)
species_info = SpeciesInfo(species_keys, best_fitness, last_improved, member_count)
# TODO: Simplify the coded
center_nodes = jnp.where(spe_st[:, None, None], jnp.nan, state.center_genomes.nodes)
center_conns = jnp.where(spe_st[:, None, None], jnp.nan, state.center_genomes.conns)
state = state.update(
species_keys=species_keys,
best_fitness=best_fitness,
last_improved=last_improved,
member_count=member_count,
center_genomes=state.center_genomes.update(center_nodes, center_conns)
species_info=species_info,
center_genomes=Genome(center_nodes, center_conns)
)
return state, species_fitness
@@ -103,18 +99,20 @@ def cal_spawn_numbers(state):
e.g. N = 3, P=10 -> probability = [0.5, 0.33, 0.17], spawn_number = [5, 3, 2]
"""
is_species_valid = ~jnp.isnan(state.species_keys)
species_keys = state.species_info.species_keys
is_species_valid = ~jnp.isnan(species_keys)
valid_species_num = jnp.sum(is_species_valid)
denominator = (valid_species_num + 1) * valid_species_num / 2 # obtain 3 + 2 + 1 = 6
rank_score = valid_species_num - jnp.arange(state.species_keys.shape[0]) # obtain [3, 2, 1]
rank_score = valid_species_num - jnp.arange(species_keys.shape[0]) # obtain [3, 2, 1]
spawn_number_rate = rank_score / denominator # obtain [0.5, 0.33, 0.17]
spawn_number_rate = jnp.where(is_species_valid, spawn_number_rate, 0) # set invalid species to 0
target_spawn_number = jnp.floor(spawn_number_rate * state.P) # calculate member
# Avoid too much variation of numbers in a species
previous_size = state.member_count
previous_size = state.species_info.member_count
spawn_number = previous_size + (target_spawn_number - previous_size) * state.spawn_number_change_rate
# jax.debug.print("previous_size: {}, spawn_number: {}", previous_size, spawn_number)
spawn_number = spawn_number.astype(jnp.int32)
@@ -127,14 +125,14 @@ def cal_spawn_numbers(state):
def create_crossover_pair(state, randkey, spawn_number, fitness):
species_size = state.species_keys.shape[0]
species_size = state.species_info.size()
pop_size = fitness.shape[0]
s_idx = jnp.arange(species_size)
p_idx = jnp.arange(pop_size)
# def aux_func(key, idx):
def aux_func(key, idx):
members = state.idx2species == state.species_keys[idx]
members = state.idx2species == state.species_info.species_keys[idx]
members_num = jnp.sum(members)
members_fitness = jnp.where(members, fitness, -jnp.inf)
@@ -176,7 +174,7 @@ def create_speciate(gene_type: Type[Gene]):
distance = create_distance(gene_type)
def speciate(state):
pop_size, species_size = state.idx2species.shape[0], state.species_keys.shape[0]
pop_size, species_size = state.idx2species.shape[0], state.species_info.size()
# prepare distance functions
o2p_distance_func = vmap(distance, in_axes=(None, None, 0)) # one to population
@@ -191,25 +189,23 @@ def create_speciate(gene_type: Type[Gene]):
def cond_func(carry):
i, i2s, cgs, o2c = carry
return (i < species_size) & (~jnp.isnan(state.species_keys[i])) # current species is existing
return (i < species_size) & (~jnp.isnan(state.species_info.species_keys[i])) # current species is existing
def body_func(carry):
i, i2s, cgs, o2c = carry
distances = o2p_distance_func(state, Genome(cgs.nodes[i], cgs.conns[i]), state.pop_genomes)
distances = o2p_distance_func(state, cgs[i], state.pop_genomes)
# find the closest one
closest_idx = argmin_with_mask(distances, mask=jnp.isnan(i2s))
# jax.debug.print("closest_idx: {}", closest_idx)
i2s = i2s.at[closest_idx].set(state.species_keys[i])
cn = cgs.nodes.at[i].set(state.pop_genomes.nodes[closest_idx])
cc = cgs.conns.at[i].set(state.pop_genomes.conns[closest_idx])
i2s = i2s.at[closest_idx].set(state.species_info.species_keys[i])
cgs = cgs.set(i, state.pop_genomes[closest_idx])
# the genome with closest_idx will become the new center, thus its distance to center is 0.
o2c = o2c.at[closest_idx].set(0)
return i + 1, i2s, Genome(cn, cc), o2c
return i + 1, i2s, cgs, o2c
_, idx2species, center_genomes, o2c_distances = \
jax.lax.while_loop(cond_func, body_func, (0, idx2species, state.center_genomes, o2c_distances))
@@ -247,15 +243,13 @@ def create_speciate(gene_type: Type[Gene]):
idx = fetch_first(jnp.isnan(i2s))
# assign it to the new species
# [key, best score, last update generation, members_count]
# [key, best score, last update generation, member_count]
sk = sk.at[i].set(nsk)
i2s = i2s.at[idx].set(nsk)
o2c = o2c.at[idx].set(0)
# update center genomes
cn = cgs.nodes.at[i].set(state.pop_genomes.nodes[idx])
cc = cgs.conns.at[i].set(state.pop_genomes.conns[idx])
cgs = Genome(cn, cc)
cgs = cgs.set(i, state.pop_genomes[idx])
i2s, o2c = speciate_by_threshold(i, i2s, cgs, sk, o2c)
@@ -273,8 +267,7 @@ def create_speciate(gene_type: Type[Gene]):
def speciate_by_threshold(i, i2s, cgs, sk, o2c):
# distance between such center genome and ppo genomes
center = Genome(cgs.nodes[i], cgs.conns[i])
o2p_distance = o2p_distance_func(state, center, state.pop_genomes)
o2p_distance = o2p_distance_func(state, cgs[i], state.pop_genomes)
close_enough_mask = o2p_distance < state.compatibility_threshold
# when a genome is not assigned or the distance between its current center is bigger than this center
@@ -294,32 +287,31 @@ def create_speciate(gene_type: Type[Gene]):
_, idx2species, center_genomes, species_keys, _, next_species_key = jax.lax.while_loop(
cond_func,
body_func,
(0, state.idx2species, state.center_genomes, state.species_keys, o2c_distances, state.next_species_key)
(0, state.idx2species, state.center_genomes, state.species_info.species_keys, o2c_distances, state.next_species_key)
)
# if there are still some pop genomes not assigned to any species, add them to the last genome
# this condition can only happen when the number of species is reached species upper bounds
idx2species = jnp.where(jnp.isnan(idx2species), species_keys[-1], idx2species)
# complete info of species which is created in this generation
new_created_mask = (~jnp.isnan(species_keys)) & jnp.isnan(state.best_fitness)
best_fitness = jnp.where(new_created_mask, -jnp.inf, state.best_fitness)
last_improved = jnp.where(new_created_mask, state.generation, state.last_improved)
new_created_mask = (~jnp.isnan(species_keys)) & jnp.isnan(state.species_info.best_fitness)
best_fitness = jnp.where(new_created_mask, -jnp.inf, state.species_info.best_fitness)
last_improved = jnp.where(new_created_mask, state.generation, state.species_info.last_improved)
# update members count
def count_members(idx):
key = species_keys[idx]
count = jnp.sum(idx2species == key)
count = jnp.sum(idx2species == key, dtype=jnp.float32)
count = jnp.where(jnp.isnan(key), jnp.nan, count)
return count
member_count = vmap(count_members)(jnp.arange(species_size))
return state.update(
species_keys=species_keys,
best_fitness=best_fitness,
last_improved=last_improved,
members_count=member_count,
species_info = SpeciesInfo(species_keys, best_fitness, last_improved, member_count),
idx2species=idx2species,
center_genomes=center_genomes,
next_species_key=next_species_key

55
algorithm/neat/species/species_info.py Normal file
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@@ -0,0 +1,55 @@
from jax.tree_util import register_pytree_node_class
import numpy as np
import jax.numpy as jnp
@register_pytree_node_class
class SpeciesInfo:
def __init__(self, species_keys, best_fitness, last_improved, member_count):
self.species_keys = species_keys
self.best_fitness = best_fitness
self.last_improved = last_improved
self.member_count = member_count
@classmethod
def initialize(cls, state):
species_keys = np.full((state.S,), np.nan, dtype=np.float32)
best_fitness = np.full((state.S,), np.nan, dtype=np.float32)
last_improved = np.full((state.S,), np.nan, dtype=np.float32)
member_count = np.full((state.S,), np.nan, dtype=np.float32)
species_keys[0] = 0
best_fitness[0] = -np.inf
last_improved[0] = 0
member_count[0] = state.P
return cls(species_keys, best_fitness, last_improved, member_count)
def __getitem__(self, i):
return SpeciesInfo(self.species_keys[i], self.best_fitness[i], self.last_improved[i], self.member_count[i])
def get(self, i):
return self.species_keys[i], self.best_fitness[i], self.last_improved[i], self.member_count[i]
def set(self, idx, value):
species_keys = self.species_keys.at[idx].set(value[0])
best_fitness = self.best_fitness.at[idx].set(value[1])
last_improved = self.last_improved.at[idx].set(value[2])
member_count = self.member_count.at[idx].set(value[3])
return SpeciesInfo(species_keys, best_fitness, last_improved, member_count)
def remove(self, idx):
return self.set(idx, jnp.array([jnp.nan] * 4))
def size(self):
return self.species_keys.shape[0]
def tree_flatten(self):
children = self.species_keys, self.best_fitness, self.last_improved, self.member_count
aux_data = None
return children, aux_data
@classmethod
def tree_unflatten(cls, aux_data, children):
return cls(*children)