Added reward A2

Rl.py

@@ -181,7 +181,7 @@ def rewardA2(appliable, config, action, missingLinks):
             break
         else :
           canceledRewards.append(config.historyPop[i][3])
-      reward = np.log(1-sum(canceledRewards)) if -sum(canceledRewards) > 0 else 0
+      reward = np.log(1-sum(canceledRewards)) / 2 if -sum(canceledRewards) > 0 else -1
   else:
     reward = -forbiddenReward
   return reward