create function_factory.py, use to manage functions

algorithms/neat/genome/__init__.py

@@ -3,3 +3,5 @@ from .distance import create_distance_function
 from .mutate import create_mutate_function
 from .forward import create_forward_function
 from .crossover import create_crossover_function
+from .activations import act_name2key
+from .aggregations import agg_name2key