diff --git a/function.py b/function.py
index bb79a49..d0331e4 100644
--- a/function.py
+++ b/function.py
@@ -52,7 +52,7 @@ def classify0(inX, dataSet, labels, k=3):
     
     # 计算马氏距离
     diff = normalized_dataSet - normalized_inX
-    distances = np.sqrt(np.sum(diff @ inv_cov_matrix * diff, axis=1))
+    distances = np.einsum('ij,jk->i', diff, inv_cov_matrix @ diff.T)  # 使用 einsum 简化计算
     
     # 获取距离最小的 k 个样本的索引
     sorted_indices = np.argsort(distances)[:k]