Remove truncate (#8375)

Remove truncate

Author: KB-Ding

paddlenlp/trainer/trainer.py

@@ -2721,11 +2721,15 @@ def evaluation_loop(
         # Number of losses has been rounded to a multiple of batch_size and in a distributed training, the number of
         # samplers has been rounded to a multiple of batch_size, so we truncate.
         if all_losses is not None:
-            all_losses = all_losses[:num_samples]
+            all_losses = all_losses[: num_samples * int(self.args.world_size / self.args.dataset_world_size)]
         if all_preds is not None:
-            all_preds = nested_truncate(all_preds, num_samples)
+            all_preds = nested_truncate(
+                all_preds, num_samples * int(self.args.world_size / self.args.dataset_world_size)
+            )
         if all_labels is not None:
-            all_labels = nested_truncate(all_labels, num_samples)
+            all_labels = nested_truncate(
+                all_labels, num_samples * int(self.args.world_size / self.args.dataset_world_size)
+            )
 
         model.train()