tony/tensorneat-mend
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

change a lot a lot a lot!!!!!!!

Browse Source
This commit is contained in:
wls2002
2023-07-24 02:16:02 +08:00
parent 48f90c7eef
commit ac295c1921
49 changed files with 1138 additions and 1460 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
algorithm/neat/ga/__init__.py Normal file
View File

@@ -0,0 +1,2 @@
from .crossover import crossover
from .mutate import create_mutate

70
algorithm/neat/ga/crossover.py Normal file
View File

@@ -0,0 +1,70 @@
import jax
from jax import Array, numpy as jnp
from core import Genome
def crossover(randkey, genome1: Genome, genome2: Genome):
"""
use genome1 and genome2 to generate a new genome
notice that genome1 should have higher fitness than genome2 (genome1 is winner!)
"""
randkey_1, randkey_2, key= jax.random.split(randkey, 3)
# crossover nodes
keys1, keys2 = genome1.nodes[:, 0], genome2.nodes[:, 0]
# make homologous genes align in nodes2 align with nodes1
nodes2 = align_array(keys1, keys2, genome2.nodes, False)
nodes1 = genome1.nodes
# For not homologous genes, use the value of nodes1(winner)
# For homologous genes, use the crossover result between nodes1 and nodes2
new_nodes = jnp.where(jnp.isnan(nodes1) | jnp.isnan(nodes2), nodes1, crossover_gene(randkey_1, nodes1, nodes2))
# crossover connections
con_keys1, con_keys2 = genome1.conns[:, :2], genome2.conns[:, :2]
conns2 = align_array(con_keys1, con_keys2, genome2.conns, True)
conns1 = genome1.conns
new_cons = jnp.where(jnp.isnan(conns1) | jnp.isnan(conns2), conns1, crossover_gene(randkey_2, conns1, conns2))
return genome1.update(new_nodes, new_cons)
def align_array(seq1: Array, seq2: Array, ar2: Array, is_conn: bool) -> Array:
"""
After I review this code, I found that it is the most difficult part of the code. Please never change it!
make ar2 align with ar1.
:param seq1:
:param seq2:
:param ar2:
:param is_conn:
:return:
align means to intersect part of ar2 will be at the same position as ar1,
non-intersect part of ar2 will be set to Nan
"""
seq1, seq2 = seq1[:, jnp.newaxis], seq2[jnp.newaxis, :]
mask = (seq1 == seq2) & (~jnp.isnan(seq1))
if is_conn:
mask = jnp.all(mask, axis=2)
intersect_mask = mask.any(axis=1)
idx = jnp.arange(0, len(seq1))
idx_fixed = jnp.dot(mask, idx)
refactor_ar2 = jnp.where(intersect_mask[:, jnp.newaxis], ar2[idx_fixed], jnp.nan)
return refactor_ar2
def crossover_gene(rand_key: Array, g1: Array, g2: Array) -> Array:
"""
crossover two genes
:param rand_key:
:param g1:
:param g2:
:return:
only gene with the same key will be crossover, thus don't need to consider change key
"""
r = jax.random.uniform(rand_key, shape=g1.shape)
return jnp.where(r > 0.5, g1, g2)

189
algorithm/neat/ga/mutate.py Normal file
View File

@@ -0,0 +1,189 @@
from typing import Tuple, Type
import jax
from jax import Array, numpy as jnp, vmap
from config import NeatConfig
from core import State, Gene, Genome
from utils import check_cycles, fetch_random, fetch_first, I_INT, unflatten_conns
def create_mutate(config: NeatConfig, gene_type: Type[Gene]):
"""
Create function to mutate a single genome
"""
def mutate_structure(state: State, randkey, genome: Genome, new_node_key):
def mutate_add_node(key_, genome_: Genome):
i_key, o_key, idx = choice_connection_key(key_, genome_.conns)
def nothing():
return genome_
def successful_add_node():
# disable the connection
new_genome = genome_.update_conns(genome_.conns.at[idx, 2].set(False))
# add a new node
new_genome = new_genome.add_node(new_node_key, gene_type.new_node_attrs(state))
# add two new connections
new_genome = new_genome.add_conn(i_key, new_node_key, True, gene_type.new_conn_attrs(state))
new_genome = new_genome.add_conn(new_node_key, o_key, True, gene_type.new_conn_attrs(state))
return new_genome
# if from_idx == I_INT, that means no connection exist, do nothing
return jax.lax.cond(idx == I_INT, nothing, successful_add_node)
def mutate_delete_node(key_, genome_: Genome):
# TODO: Do we really need to delete a node?
# randomly choose a node
key, idx = choice_node_key(key_, genome_.nodes, state.input_idx, state.output_idx,
allow_input_keys=False, allow_output_keys=False)
def nothing():
return genome_
def successful_delete_node():
# delete the node
new_genome = genome_.delete_node_by_pos(idx)
# delete all connections
new_conns = jnp.where(((new_genome.conns[:, 0] == key) | (new_genome.conns[:, 1] == key))[:, None],
jnp.nan, new_genome.conns)
return new_genome.update_conns(new_conns)
return jax.lax.cond(idx == I_INT, nothing, successful_delete_node)
def mutate_add_conn(key_, genome_: Genome):
# randomly choose two nodes
k1_, k2_ = jax.random.split(key_, num=2)
i_key, from_idx = choice_node_key(k1_, genome_.nodes, state.input_idx, state.output_idx,
allow_input_keys=True, allow_output_keys=True)
o_key, to_idx = choice_node_key(k2_, genome_.nodes, state.input_idx, state.output_idx,
allow_input_keys=False, allow_output_keys=True)
conn_pos = fetch_first((genome_.conns[:, 0] == i_key) & (genome_.conns[:, 1] == o_key))
def nothing():
return genome_
def successful():
return genome_.add_conn(i_key, o_key, True, gene_type.new_conn_attrs(state))
def already_exist():
return genome_.update_conns(genome_.conns.at[conn_pos, 2].set(True))
is_already_exist = conn_pos != I_INT
if config.network_type == 'feedforward':
u_cons = unflatten_conns(genome_.nodes, genome_.conns)
cons_exist = jnp.where(~jnp.isnan(u_cons[0, :, :]), True, False)
is_cycle = check_cycles(genome_.nodes, cons_exist, from_idx, to_idx)
choice = jnp.where(is_already_exist, 0, jnp.where(is_cycle, 1, 2))
return jax.lax.switch(choice, [already_exist, nothing, successful])
elif config.network_type == 'recurrent':
return jax.lax.cond(is_already_exist, already_exist, successful)
else:
raise ValueError(f"Invalid network type: {config.network_type}")
def mutate_delete_conn(key_, genome_: Genome):
# randomly choose a connection
i_key, o_key, idx = choice_connection_key(key_, genome_.conns)
def nothing():
return genome_
def successfully_delete_connection():
return genome_.delete_conn_by_pos(idx)
return jax.lax.cond(idx == I_INT, nothing, successfully_delete_connection)
k1, k2, k3, k4 = jax.random.split(randkey, num=4)
r1, r2, r3, r4 = jax.random.uniform(k1, shape=(4,))
def no(k, g):
return g
genome = jax.lax.cond(r1 < config.node_add, mutate_add_node, no, k1, genome)
genome = jax.lax.cond(r2 < config.node_delete, mutate_delete_node, no, k2, genome)
genome = jax.lax.cond(r3 < config.conn_add, mutate_add_conn, no, k3, genome)
genome = jax.lax.cond(r4 < config.conn_delete, mutate_delete_conn, no, k4, genome)
return genome
def mutate_values(state: State, randkey, genome: Genome):
k1, k2 = jax.random.split(randkey, num=2)
nodes_keys = jax.random.split(k1, num=genome.nodes.shape[0])
conns_keys = jax.random.split(k2, num=genome.conns.shape[0])
nodes_attrs, conns_attrs = genome.nodes[:, 1:], genome.conns[:, 3:]
new_nodes_attrs = vmap(gene_type.mutate_node, in_axes=(None, 0, 0))(state, nodes_attrs, nodes_keys)
new_conns_attrs = vmap(gene_type.mutate_conn, in_axes=(None, 0, 0))(state, conns_attrs, conns_keys)
# nan nodes not changed
new_nodes_attrs = jnp.where(jnp.isnan(nodes_attrs), jnp.nan, new_nodes_attrs)
new_conns_attrs = jnp.where(jnp.isnan(conns_attrs), jnp.nan, new_conns_attrs)
new_nodes = genome.nodes.at[:, 1:].set(new_nodes_attrs)
new_conns = genome.conns.at[:, 3:].set(new_conns_attrs)
return genome.update(new_nodes, new_conns)
def mutate(state, randkey, genome: Genome, new_node_key):
k1, k2 = jax.random.split(randkey)
genome = mutate_structure(state, k1, genome, new_node_key)
genome = mutate_values(state, k2, genome)
return genome
return mutate
def choice_node_key(rand_key: Array, nodes: Array,
input_keys: Array, output_keys: Array,
allow_input_keys: bool = False, allow_output_keys: bool = False) -> Tuple[Array, Array]:
"""
Randomly choose a node key from the given nodes. It guarantees that the chosen node not be the input or output node.
:param rand_key:
:param nodes:
:param input_keys:
:param output_keys:
:param allow_input_keys:
:param allow_output_keys:
:return: return its key and position(idx)
"""
node_keys = nodes[:, 0]
mask = ~jnp.isnan(node_keys)
if not allow_input_keys:
mask = jnp.logical_and(mask, ~jnp.isin(node_keys, input_keys))
if not allow_output_keys:
mask = jnp.logical_and(mask, ~jnp.isin(node_keys, output_keys))
idx = fetch_random(rand_key, mask)
key = jnp.where(idx != I_INT, nodes[idx, 0], jnp.nan)
return key, idx
def choice_connection_key(rand_key: Array, conns: Array):
"""
Randomly choose a connection key from the given connections.
:return: i_key, o_key, idx
"""
idx = fetch_random(rand_key, ~jnp.isnan(conns[:, 0]))
i_key = jnp.where(idx != I_INT, conns[idx, 0], jnp.nan)
o_key = jnp.where(idx != I_INT, conns[idx, 1], jnp.nan)
return i_key, o_key, idx