Make agent move to actual random closest position (#2119)

EwoutH · web-flow · commit 2e282e19c781 · 2024-04-23T21:32:33.000+02:00
This fixes a bug in which move_agent_to_one_of is deterministic when pos has multiple closest choices and selection="closest".
diff --git a/mesa/space.py b/mesa/space.py
@@ -461,6 +461,7 @@ def move_agent_to_one_of(
                 # Find the closest position without sorting all positions
                 closest_pos = None
                 min_distance = float("inf")
+                agent.random.shuffle(pos)
                 for p in pos:
                     distance = self._distance_squared(p, current_pos)
                     if distance < min_distance:
