Update modeling_chexagent.py

modeling_chexagent.py

@@ -49,7 +49,7 @@ try:
 except:
     pass
 
-# assert transformers.__version__ == "4.40.0", "Please install a specific HF transformers version: pip install transformers==4.40.0"
+assert transformers.__version__ == "4.40.0", "Please install a specific HF transformers version: pip install transformers==4.40.0"
 
 logger = logging.get_logger(__name__)