update model parameters

app.py

@@ -14,7 +14,10 @@ def GPT_answer(prompt):
         prompt=prompt,
         temperature=0.3,
         max_tokens=500,
-        n=1
+        top_p=1,
+        best_of=10,
+        frequency_penalty=1,
+        presence_penalty=1
     )
     response = completion.choices[0].text
     return response