diff --git a/qlib/model/trainer.py b/qlib/model/trainer.py
index a534a7a3b49..3f1ae8a96a9 100644
--- a/qlib/model/trainer.py
+++ b/qlib/model/trainer.py
@@ -12,7 +12,6 @@
 """
 
 import socket
-import time
 from typing import Callable, List
 
 from qlib.data.dataset import Dataset
diff --git a/qlib/workflow/utils.py b/qlib/workflow/utils.py
index 5a93eacca53..6e1e76529a5 100644
--- a/qlib/workflow/utils.py
+++ b/qlib/workflow/utils.py
@@ -1,10 +1,14 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT License.
 
-import sys, traceback, signal, atexit, logging
+import atexit
+import logging
+import sys
+import traceback
+
+from ..log import get_module_logger
 from . import R
 from .recorder import Recorder
-from ..log import get_module_logger
 
 logger = get_module_logger("workflow", logging.INFO)