Update app.py

app.py

@@ -128,8 +128,8 @@ def generate_math_questions(grade, term, qtype="Unspecified", num_questions=10):
     # 使用 InferenceClient 呼叫 API 模型產生新題目
     completion = client.chat.completions.create(
         # model="mistralai/Mistral-7B-Instruct-v0.3",
-        # model="perplexity-ai/r1-1776",
-        model="mistralai/Mistral-Nemo-Instruct-2407", 
+        model="perplexity-ai/r1-1776",
+        # model="mistralai/Mistral-Nemo-Instruct-2407", 
         messages=messages,
         max_tokens=2048
     )