fix reward score

Author: Tong Li

applications/ColossalChat/coati/distributed/reward/reward_fn.py

@@ -4,6 +4,8 @@
 
 
 def math_reward_fn(input_ids, gt_answer, response_idx, **kwargs):
+    format_score = 1.0
+    acc_score = 9.0
     tokenizer = kwargs["tokenizer"]
     reward = torch.tensor(0.0)
     format_reward = torch.tensor(0.0)
@@ -20,16 +22,16 @@ def math_reward_fn(input_ids, gt_answer, response_idx, **kwargs):
 
     # Check format accuracy
     if format_valid:
-        format_reward += 1.0
-        reward += 1.0
+        format_reward += format_score
+        reward += format_score
 
     # Check answer accuracy
     if (
         final_answer is not None
         and gt_answer.strip().replace(" ", "").lower() == final_answer.strip().replace(" ", "").lower()
     ):
-        acc_reward += 5.0
-        reward += 5.0
+        acc_reward += acc_score
+        reward += acc_score
 
     return torch.tensor([reward, format_reward, acc_reward]).to(input_ids.device)