generated from LufsX/Challenge-kNN
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+14
@@ -7,9 +7,12 @@ name = "张钦诚"
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def classify0(inX, dataSet, labels, k=5):
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inX = np.array(inX)
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# 计算欧氏距离的平方,避免开平方以提高效率
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distances = np.sum((dataSet - inX) ** 2, axis=1)
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# 获取距离最小的k个样本的索引
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nearest_indices = np.argpartition(distances, k)[:k]
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nearest_labels = labels[nearest_indices]
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# 统计k个最近邻中出现次数最多的标签
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label_count = Counter(nearest_labels)
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return label_count.most_common(1)[0][0]
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@@ -20,8 +23,12 @@ def load_data(file_path):
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return features, labels
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def standardize(train_data, test_data):
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"""
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对训练数据和测试数据进行标准化处理。
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"""
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mean = np.mean(train_data, axis=0)
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std = np.std(train_data, axis=0)
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# 防止标准差为零
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std[std == 0] = 1
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train_standardized = (train_data - mean) / std
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test_standardized = (test_data - mean) / std
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@@ -31,17 +38,24 @@ if __name__ == "__main__":
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train_file = "datingTrainSet2.tsv"
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test_file = "datingTestSet2.tsv"
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# 加载训练数据
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train_data, train_labels = load_data(train_file)
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# 加载测试数据
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test_data, test_labels = load_data(test_file)
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# 数据标准化
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train_data, test_data = standardize(train_data, test_data)
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# 测试样本
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test_sample = [65915, 3.868359, 0.128078]
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# 标准化测试样本
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test_sample = (np.array(test_sample) - np.mean(train_data, axis=0)) / np.std(train_data, axis=0)
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# 预测标签
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predicted_label = classify0(test_sample, train_data, train_labels)
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print(f"预测的分类标签: {predicted_label}")
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# 计算准确率
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predictions = np.array([classify0(sample, train_data, train_labels) for sample in test_data])
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accuracy = np.mean(predictions == test_labels) * 100
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print(f"准确率: {accuracy:.2f}%")
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