The whole NEAT algorithm is written into functional programming.

algorithms/neat/genome/__init__.py

@@ -1,7 +1,6 @@
 from .mutate import mutate
 from .distance import distance
 from .crossover import crossover
-from .forward import create_forward
 from .graph import topological_sort, check_cycles
 from .utils import unflatten_connections
-from .genome import initialize_genomes, expand, expand_single
+from .forward import create_forward_function