diff --git a/function.py b/function.py
index d689d13..3efc983 100644
--- a/function.py
+++ b/function.py
@@ -1,6 +1,6 @@
 # function.py
 import numpy as np
-
+from collections import Counter  
 """
 挑战说明:
 - 自行编写实现 KNN 分类算法。