Update app.py

app.py

@@ -50,6 +50,7 @@ def init():
 
 @spaces.GPU(duration=120)
 def generate_text(messages):
+    global text_generator
     if is_hugging_face:#need everytime initialize for ZeroGPU
         model = AutoModelForCausalLM.from_pretrained(
                 model_id, token=huggingface_token ,torch_dtype=dtype,device_map=device