fix button bug

LLAMA2.py

@@ -16,11 +16,6 @@ text="""4Bit QLoRA Fine-Tuned LLM on English Quotes Dataset."""
 
 st.caption(text)
 
-user_input = st.text_area(
-    label = "Prompt...",
-    value = "Tell me a joke."
-)
-
 model_id = "iamsubrata/Llama-2-7b-chat-hf-sharded-bf16-fine-tuned"
 
 LLM = pipeline(
@@ -28,7 +23,12 @@ LLM = pipeline(
     model = model_id
 )
 
-if text_input:
+user_input = st.text_area(
+    label = "Prompt...",
+    value = "Tell me a joke."
+)
+
+if user_input:
     button  = st.button(
         label = "Generate",
         key = "generate"