diff --git a/samplelib/SampleGeneratorFacePerson.py b/samplelib/SampleGeneratorFacePerson.py
index 0fbd2c3..a93567d 100644
--- a/samplelib/SampleGeneratorFacePerson.py
+++ b/samplelib/SampleGeneratorFacePerson.py
@@ -1,5 +1,7 @@
 import copy
 import multiprocessing
+import threading
+import time
 import traceback
 
 import cv2