modifying

neat/genome/crossover_.py

@@ -1,14 +1,17 @@
-from functools import partial
+"""
+Crossover two genomes to generate a new genome.
+The calculation method is the same as the crossover operation in NEAT-python.
+See https://neat-python.readthedocs.io/en/latest/_modules/genome.html#DefaultGenome.configure_crossover
+"""
 from typing import Tuple
 
 import jax
-from jax import jit, vmap, Array
+from jax import jit, Array
 from jax import numpy as jnp
 
 
 @jit
-def crossover(randkey: Array, nodes1: Array, cons1: Array, nodes2: Array, cons2: Array) \
-        -> Tuple[Array, Array]:
+def crossover(randkey: Array, nodes1: Array, cons1: Array, nodes2: Array, cons2: Array) -> Tuple[Array, Array]:
     """
     use genome1 and genome2 to generate a new genome
     notice that genome1 should have higher fitness than genome2 (genome1 is winner!)
@@ -23,7 +26,11 @@ def crossover(randkey: Array, nodes1: Array, cons1: Array, nodes2: Array, cons2:
 
     # crossover nodes
     keys1, keys2 = nodes1[:, 0], nodes2[:, 0]
+    # make homologous genes align in nodes2 align with nodes1
     nodes2 = align_array(keys1, keys2, nodes2, 'node')
+
+    # 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
@@ -34,7 +41,6 @@ def crossover(randkey: Array, nodes1: Array, cons1: Array, nodes2: Array, cons2:
     return new_nodes, new_cons
 
 
-# @partial(jit, static_argnames=['gene_type'])
 def align_array(seq1: Array, seq2: Array, ar2: Array, gene_type: str) -> Array:
     """
     After I review this code, I found that it is the most difficult part of the code. Please never change it!
@@ -62,7 +68,6 @@ def align_array(seq1: Array, seq2: Array, ar2: Array, gene_type: str) -> Array:
     return refactor_ar2
 
 
-# @jit
 def crossover_gene(rand_key: Array, g1: Array, g2: Array) -> Array:
     """
     crossover two genes