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Abschlussprojekt/genome.py

@@ -2,9 +2,11 @@ from __future__ import annotations
 
 from dataclasses import dataclass
 from enum import Enum
-from random import choice, random
-import networkx as nx
+from random import choice
+import numpy as np
+from graphs import creates_cycle
 
+rng = np.random.default_rng()
 
 class NodeType(Enum):
     INPUT = 1
@@ -90,8 +92,8 @@ class Genome:
 
 
 def mutate(genome: Genome) -> None:
-    mutation = choice([MutationType.ADD_CONNECTION])
-
+    mutation = choice([MutationType.ADD_NODE, MutationType.ADD_CONNECTION])
+    print(mutation)
     if mutation is MutationType.ADD_CONNECTION:
         _mutate_add_connection(genome)
     elif mutation is MutationType.ADD_NODE:
@@ -104,22 +106,18 @@ def _mutate_add_connection(genome: Genome) -> None:
     is added connecting two previously unconnected nodes.
     """
 
-    from_node = choice([node for node in genome.nodes if not node.type != NodeType.OUTPUT])
+    from_node = choice([node for node in genome.nodes.values() if not node.type != NodeType.OUTPUT])
+    to_node = choice([node for node in genome.nodes.values() if node.type != NodeType.INPUT])
 
-    inputs = [node.id for node in genome.nodes.values() if node.type == NodeType.INPUT]
-    distance_to_input = _distance_to_input(genome, from_node, inputs)
-    to_node = choice([node for node in genome.nodes if _distance_to_input(genome, node, inputs) < distance_to_input and tuple[from_node, node] not in genome.connections])
+    # Checking if connection already exists
+    if (from_node, to_node) in genome.connections:
+        return
     
-    genome.add_connection(from_node, to_node, weight=random.uniform(0,1))
+    # Checking for cycles
+    if creates_cycle(genome.connections.keys(), (from_node.id, to_node.id)):
+        return
 
-
-def _distance_to_input(g: Genome, node, inputs) -> int:
-    paths = []
-    for input_node in inputs:
-        paths += list(nx.all_simple_paths(g, input_node, node))
-
-    path_lengths = [len(path) for path in paths]
-    return max(path_lengths)
+    genome.add_connection(from_node, to_node, weight=rng.uniform(0,1))
 
 
 def _mutate_add_node(genome: Genome) -> None:

Abschlussprojekt/graphs.py

@@ -0,0 +1,28 @@
+
+
+
+
+def creates_cycle(connections: list[tuple[int, int]], test: tuple[int, int]) -> bool:
+    """
+    Returns true if the addition of the 'test' connection would create a cycle,
+    assuming that no cycle already exists in the graph represented by 'connections'.
+    https://github.com/CodeReclaimers/neat-python/blob/4928381317213ee3285204ae1f2a086286aa3a10/neat/graphs.py#L4
+    """
+
+    i, o = test
+    if i == o:
+        return True
+    
+    visited = {o}
+    while True:
+        num_added = 0
+        for a, b in connections:
+            if a in visited and b not in visited:
+                if b == i:
+                    return True
+
+                visited.add(b)
+                num_added += 1
+
+        if num_added == 0:
+            return False