From 12a669957532c2a12699ed419d3054f26484b873 Mon Sep 17 00:00:00 2001
From: cy <939601402@qq.com>
Date: Tue, 15 Oct 2024 19:02:26 +0800
Subject: [PATCH] =?UTF-8?q?=E6=9B=B4=E6=96=B0=20function.py?=
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---
 function.py | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/function.py b/function.py
index 6829644..9e9362d 100644
--- a/function.py
+++ b/function.py
@@ -42,10 +42,15 @@ def classify(input_vector, dataSet, labels, k=2):
     - int: 预测的分类标签。
     """
     dataSet_size = dataSet.shape[0]
-    # 计算曼哈顿距离
+    # 计算马氏距离
+    cov_matrix = np.cov(dataSet.T)
+    inv_cov_matrix = np.linalg.inv(cov_matrix)
     diff_mat = np.tile(input_vector, (dataSet_size, 1)) - dataSet
-    abs_diff_mat = np.abs(diff_mat)
-    distances = abs_diff_mat.sum(axis=1)
+    distances = []
+    for i in range(dataSet_size):
+        distance = np.sqrt(np.dot(np.dot(diff_mat[i], inv_cov_matrix), diff_mat[i].T))
+        distances.append(distance)
+    distances = np.array(distances)
     # 对距离进行排序
     sorted_indices = distances.argsort()
     class_count = {}