add overlength sample count (#6332)

Co-authored-by: Tong Li <[email protected]>

Author: TongLi3701

applications/ColossalChat/coati/distributed/grpo_consumer.py

@@ -85,6 +85,8 @@ def __init__(
         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
@@ -227,10 +229,18 @@ def step(self, step_idx: int, pbar: Any, **kwargs) -> Optional[float]:
 
         # 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,
             )
+
+            self.overlength_samples = (old_loss_mask & ~loss_mask).sum().item()
+            self.overlength_samples = all_reduce_sum(
+                torch.tensor(self.overlength_samples, device=loss_mask.device), self.plugin
+            )
+            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
@@ -484,9 +494,11 @@ def _criterion(outputs, inputs):
             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
             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
@@ -502,6 +514,7 @@ def _criterion(outputs, inputs):
                         f"Advantages: {self.accum_advantages.item() / self.accum_count:.4f}",
                         f"Response Length: {self.accum_response_length.item() / self.accum_count:.4f}",
                         f"Sample_utilization: {sample_utilization:.4f}",
+                        f"Percentage of overlength samples: {overlength_samples_percentage:.4f}",
                     ] + ([f"KL: {self.accum_kl.item() / self.accum_count:.4f}"] if self.policy_loss_fn.beta > 0 else [])
                     print("\n".join(to_log_msg))
                     metrics = {
@@ -513,6 +526,7 @@ def _criterion(outputs, inputs):
                         "train/advantages": self.accum_advantages.item() / self.accum_count,
                         "train/learning_rate": self.lr_scheduler.get_last_lr()[0],
                         "train/sample_utilization": sample_utilization,
+                        "train/percentage_overlength_samples": overlength_samples_percentage,
                         "rollout/temperature": data["temperature"].cpu().numpy()[0][0],
                     }
                     if self.policy_loss_fn.beta > 0: