Update gen/gemini_chat.py

gen/gemini_chat.py

@@ -75,7 +75,7 @@ def _default_gen_text():
     return {
         "temperature": 0.9,
         "top_p": 1,
-        "top_k": 1,
+        "top_k": 32,
         "max_output_tokens": 2048,
     }