diff --git a/machine-learning/app/sessions/rknn/rknnpool.py b/machine-learning/app/sessions/rknn/rknnpool.py
index de76306fb8..f37707ee71 100644
--- a/machine-learning/app/sessions/rknn/rknnpool.py
+++ b/machine-learning/app/sessions/rknn/rknnpool.py
@@ -1,8 +1,8 @@
 # This code is from leafqycc/rknn-multi-threaded
 # Following Apache License 2.0
 
-from concurrent.futures import Future, ThreadPoolExecutor
 import logging
+from concurrent.futures import Future, ThreadPoolExecutor
 from pathlib import Path
 from queue import Queue
 from typing import Callable