Update main.py

main.py

@@ -60,7 +60,7 @@ async def stream(item: validation):
     prefix=model['prefix']
     suffix=model['suffix']
     nctx =  item.nctx if item.nctx is not None else model['nctx']
-    max_tokens = item.max_tokens if item.max_tokens is not None else model 512
+    max_tokens = item.max_tokens if item.max_tokens is not None else 512
     user="""
     {prompt}"""