[Serving] Fix lints

Author: vinx13

cpp/serve/engine_state.cc

@@ -12,10 +12,10 @@ namespace serve {
 
 String EngineStats::AsJSON() const {
   picojson::object config;
-  config["single_token_prefill_latency"] =
-      picojson::value(total_prefill_length > 0 ? request_total_prefill_time / total_prefill_length : 0.0);
-  config["single_token_decode_latency"] =
-      picojson::value(total_decode_length > 0 ? request_total_decode_time / total_decode_length : 0.0);
+  config["single_token_prefill_latency"] = picojson::value(
+      total_prefill_length > 0 ? request_total_prefill_time / total_prefill_length : 0.0);
+  config["single_token_decode_latency"] = picojson::value(
+      total_decode_length > 0 ? request_total_decode_time / total_decode_length : 0.0);
   config["engine_total_prefill_time"] = picojson::value(engine_total_prefill_time);
   config["engine_total_decode_time"] = picojson::value(engine_total_decode_time);
   config["total_prefill_tokens"] = picojson::value(total_prefill_length);

python/mlc_llm/serve/engine_base.py

@@ -1120,6 +1120,7 @@ def _debug_call_func_on_all_worker(self, func_name: str) -> None:
         self._ffi["debug_call_func_on_all_worker"](func_name)
 
     def stats(self):
+        """Get the engine stats.""""
         return self._ffi["stats"]()