Update utils.py

utils.py

@@ -108,7 +108,7 @@ def num_tokens_from_string(string: str, encoding_name: str) -> int:
 def chat(
     query: str,
     history: list,
-    query_mode : str,
+    query_mode : str = 'HYDE',
     threshold: float = CFG_APP.THRESHOLD,
     k_total: int = CFG_APP.K_TOTAL,
 ) -> tuple:
@@ -157,7 +157,7 @@ def chat(
 
     messages = history + [{"role": "user", "content": query}]
 
-    if query_mode == 'HYDE' :
+    if query_mode is None or query_mode == 'HYDE' :
         reformulated_query = reformulated_query.split("?")[0] + '?'
 
     docs_url = defaultdict(str)