make mlx initialization faster

LLM/mlx_language_model.py

@@ -52,7 +52,7 @@ class MLXLanguageModelHandler(BaseHandler):
     def warmup(self):
         logger.info(f"Warming up {self.__class__.__name__}")
 
-        dummy_input_text = "Write me a poem about Machine Learning."
+        dummy_input_text = "Repeat the word 'home'."
         dummy_chat = [{"role": self.user_role, "content": dummy_input_text}]
 
         n_steps = 2