diff --git a/tests/python_client/testcases/test_mix.py b/tests/python_client/testcases/test_mix.py
index 53b1cab327..456054bc38 100644
--- a/tests/python_client/testcases/test_mix.py
+++ b/tests/python_client/testcases/test_mix.py
@@ -1,10 +1,6 @@
-import pdb
-import copy
 import pytest
-import threading
 import datetime
 import logging
-from time import sleep
 from multiprocessing import Process
 import sklearn.preprocessing
 from utils.utils import *