[doc] add no build isolation (#8103)

src/llamafactory/data/mm_plugin.py

@@ -63,8 +63,8 @@ if is_transformers_version_greater_than("4.49.0"):
     except ImportError:
         try:
             # If that fails, try importing from the new location
-            from transformers.video_utils import make_batched_videos
             from transformers.image_utils import make_flat_list_of_images
+            from transformers.video_utils import make_batched_videos
         except ImportError:
             raise ImportError(
                 "Could not import make_batched_videos and make_flat_list_of_images. "

src/llamafactory/train/pt/workflow.py

@@ -84,14 +84,15 @@ def run_pt(
                     perplexity = math.exp(metrics[f"eval_{key}_loss"])
                 except OverflowError:
                     perplexity = float("inf")
+
                 metrics[f"eval_{key}_perplexity"] = perplexity
         else:
             try:
                 perplexity = math.exp(metrics["eval_loss"])
             except OverflowError:
                 perplexity = float("inf")
-            metrics["eval_perplexity"] = perplexity
 
+            metrics["eval_perplexity"] = perplexity
 
         trainer.log_metrics("eval", metrics)
         trainer.save_metrics("eval", metrics)