diff --git a/applications/ColossalChat/coati/distributed/consumer.py b/applications/ColossalChat/coati/distributed/consumer.py
index 5d4df9ea4..ba7d882c9 100644
--- a/applications/ColossalChat/coati/distributed/consumer.py
+++ b/applications/ColossalChat/coati/distributed/consumer.py
@@ -217,6 +217,7 @@ class BaseConsumer:
                             effective_group_mask = None
                             if self.filter_range is not None and self.grpo_config.get("dynamic_batching", True):
                                 # filter the group based on the reward and accuracy
+                                group_ans_acc_mean = ans_acc.mean(dim=1)
                                 effective_group_mask = torch.logical_and(
                                     group_ans_acc_mean > self.filter_range[0], group_ans_acc_mean < self.filter_range[1]
                                 )
diff --git a/applications/ColossalChat/coati/distributed/grpo_consumer.py b/applications/ColossalChat/coati/distributed/grpo_consumer.py
index e44ed9227..a2c3e03d6 100644
--- a/applications/ColossalChat/coati/distributed/grpo_consumer.py
+++ b/applications/ColossalChat/coati/distributed/grpo_consumer.py
@@ -91,9 +91,6 @@ class GRPOConsumer(BaseConsumer):
         self.project_name = project_name
         self.effective_sample_count = 0
         self.effective_prompt_count = 0
-        self.total_sample_count = 0
-        self.overlength_samples = 0
-        self.total_overlength_samples = 0
         self.project_name = project_name
         self.run_name = run_name
         self.wandb_group_name = wandb_group_name
@@ -207,7 +204,6 @@ class GRPOConsumer(BaseConsumer):
 
         # filter out overlength samples
         if self.filter_truncated_response and action_mask.size(1) == self.max_length:
-            old_loss_mask = loss_mask.clone()
             loss_mask = torch.logical_and(
                 loss_mask,
                 action_mask[:, -1] == False,
@@ -225,15 +221,7 @@ class GRPOConsumer(BaseConsumer):
                     group_ans_acc_mean < self.filter_range[1],
                 ),
             )
-            self.total_overlength_samples += self.overlength_samples.item()
-
-        prompt_level_mask = loss_mask.view(self.minibatch_size, self.num_generations)
-
-        # [minibatch_size] -> calculate the number of effective prompts
-        effective_prompts_mask = prompt_level_mask.any(dim=1)
-        effective_prompts = all_reduce_sum(torch.sum(effective_prompts_mask), self.plugin)
-        self.effective_prompt_count += effective_prompts.item()
-        excessive_prompts_idx = None
+        self.effective_prompt_count += group_reward.size(0) * self.dp_size
 
         mean_kl, mean_loss = [], []
 
@@ -250,8 +238,7 @@ class GRPOConsumer(BaseConsumer):
         pbar.set_postfix(
             {
                 "Global Step": self.global_step,
-                "Effective prompts": f"{self.effective_prompt_count}/{self.batch_size * self.dp_size}",
-                "Effective samples": f"{self.effective_sample_count}/{self.batch_size * self.dp_size * self.num_generations}",
+                "Gradient Accumulation on": f"{self.effective_prompt_count}/{self.batch_size * self.dp_size} effective prompts, {self.effective_sample_count}/{self.batch_size * self.dp_size * self.num_generations} effective samples",
             }
         )
 
@@ -477,12 +464,10 @@ class GRPOConsumer(BaseConsumer):
             self.optimizer.step()
             self.optimizer.zero_grad()
             self.global_step += 1
-            sample_utilization = self.effective_sample_count / self.total_sample_count
-            overlength_samples_percentage = self.total_overlength_samples / self.total_sample_count
+            # no need to run all reduce as raw_train_batch_* are not splited across dp rank
+            sample_utilization = self.effective_sample_count / len(self.raw_train_batch_reward) / self.num_generations
             self.effective_prompt_count = 0
             self.effective_sample_count = 0
-            self.total_sample_count = 0
-            self.total_overlength_samples = 0
             loss_scalar = self.accum_loss.item()
             if not self.plugin.pp_size > 1 or (
                 self.plugin.pp_size > 1 and self.booster.plugin.stage_manager.is_last_stage() and self.tp_rank == 0
@@ -545,4 +530,4 @@ class GRPOConsumer(BaseConsumer):
         model = self.policy_model.unwrap()
         state_dict = model.state_dict()
         state_dict["consumer_global_step"] = torch.tensor([self.global_step], device=self.device)
-        return state_dict
+        return state_dict
\ No newline at end of file