if more than half agents cheat, they all move backward

Author: zrysnd

multiagent/scenarios/race.py

@@ -88,7 +88,7 @@ def agent_cheated(agent):
 
  for i, thisAgent in enumerate(world.agents):
  if numOfCheaters > numOfAgents//2:
- thisAgent.action.u[1] = 0.0 # all cheat: stay
+ thisAgent.action.u[1] = -0.1 # all cheat: move back ward
  elif numOfCheaters == 0:
  thisAgent.action.u[1] = 0.1 # all cooperate: move up together
  else: