diff --git a/function.py b/function.py
index c94c3b7..e3f32e3 100644
--- a/function.py
+++ b/function.py
@@ -1,7 +1,6 @@
 # function.py
 import numpy as np  
-from sklearn.preprocessing import StandardScaler  
-from sklearn.decomposition import PCA  # 可选：用于降维  
+from sklearn.preprocessing import StandardScaler   
 from numpy.linalg import inv, LinAlgError  
 from scipy.spatial.distance import mahalanobis
 """