Update app.py

app.py

@@ -20,8 +20,9 @@ def solve(question, history):
     messages = [
         {"role": "system", "content": "You are a helpful math tutor. Solve problems step by step, showing all working clearly."},
     ]
-    for msg in history:
-        messages.append({"role": msg["role"], "content": msg["content"]})
+    for item in history:
+        messages.append({"role": "user",      "content": item[0]})
+        messages.append({"role": "assistant", "content": item[1]})
     messages.append({"role": "user", "content": question})
 
     text = tokenizer.apply_chat_template(
@@ -47,8 +48,7 @@ def respond(question, history):
     if not question.strip():
         return "", history
     answer = solve(question, history)
-    history.append({"role": "user",      "content": question})
-    history.append({"role": "assistant", "content": answer})
+    history = history + [[question, answer]]
     return "", history
 
 # ── UI ─────────────────────────────────────────────────────
@@ -59,22 +59,17 @@ with gr.Blocks(title="Math Tutor AI") as demo:
     ---
     """)
 
-    chatbot = gr.Chatbot(
-        height           = 450,
-        label            = "Math Tutor",
-        show_copy_button = True,
-    )
+    chatbot = gr.Chatbot(height=450)
 
     with gr.Row():
         question = gr.Textbox(
             placeholder = "Type your math question here...",
             label       = "Your Question",
-            lines       = 1,
             scale       = 4,
         )
         submit = gr.Button("Solve →", variant="primary", scale=1)
 
-    clear = gr.Button("🗑️ Clear Chat", variant="secondary")
+    clear = gr.Button("🗑️ Clear Chat")
 
     gr.Examples(
         label    = "Try these examples:",
@@ -86,24 +81,13 @@ with gr.Blocks(title="Math Tutor AI") as demo:
             "Find the compound interest on ₹5000 at 10% per annum for 2 years.",
             "Prove that √2 is irrational.",
         ],
-        inputs   = question,
+        inputs = question,
     )
 
-    gr.Markdown("""
-    ---
-    *Model: Qwen2.5-Math-1.5B fine-tuned on 10K math problems*
-    """)
-
-    # ── Event Handlers ──────────────────────────────────────
-    def respond_tuple(question, history):
-        if not question.strip():
-            return "", history
-        answer = solve(question, history)
-        history = history + [[question, answer]]
-        return "", history
+    gr.Markdown("*Model: Qwen2.5-Math-1.5B fine-tuned on 10K math problems*")
 
-    submit.click(respond_tuple, [question, chatbot], [question, chatbot])
-    question.submit(respond_tuple, [question, chatbot], [question, chatbot])
+    submit.click(respond, [question, chatbot], [question, chatbot])
+    question.submit(respond, [question, chatbot], [question, chatbot])
     clear.click(lambda: ([], ""), outputs=[chatbot, question])
 
 demo.launch(theme=gr.themes.Soft())