Update baselines/LongForm/longform.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: ChenZiHong-Gavin

baselines/LongForm/longform.py

@@ -101,8 +101,8 @@ async def process_chunk(content: str):
 
     # Save results
     output_dir = os.path.dirname(args.output_file)
-    if output_dir and not os.path.exists(output_dir):
-        os.makedirs(output_dir)
+    if output_dir:
+        os.makedirs(output_dir, exist_ok=True)
 
     with open(args.output_file, "w", encoding="utf-8") as f:
         json.dump(results, f, indent=4, ensure_ascii=False)