generated from LufsX/Experiment-kNN
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+21
-15
@@ -61,15 +61,22 @@ def classify(input_vector, dataSet, labels, k=2):
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- int: 预测的分类标签。
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"""
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# 计算输入向量与训练集之间的欧氏距离
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distances = np.sum((input_vector - dataSet) ** 2, axis=1) ** 0.5
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# 根据距离排序并获取索引
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distances = np.sum((input_vector - dataSet) ** 2, axis=1)
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sorted_indices = distances.argsort()
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# 选择距离最近的k个点
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k_nearest_labels = labels[sorted_indices[:k]].tolist() # 将 NumPy 数组转换为列表
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# 统计k个点中各类别的数量
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count = Counter(k_nearest_labels)
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# 返回数量最多的类别标签
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return count.most_common(1)[0][0]
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k_nearest_distances = distances[sorted_indices[:k]]
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k_nearest_labels = labels[sorted_indices[:k]]
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# 计算权重(距离的倒数)
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weights = 1 / k_nearest_distances
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# 归一化权重
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weights /= weights.sum()
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# 计算加权投票
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weighted_votes = np.zeros((10,))
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for label, weight in zip(k_nearest_labels, weights):
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weighted_votes[label] += weight
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return np.argmax(weighted_votes)
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# 这里也写自己的代码实现
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def load_dataset(directory):
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@@ -83,22 +90,21 @@ def load_dataset(directory):
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- np.array: 特征数据(Mx1024)。
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- np.array: 标签数据(Mx1)。
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"""
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# 初始化特征数据列表和标签列表
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feature_list = []
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label_list = []
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# 遍历目录中的所有文件
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for file in os.listdir(directory):
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# 获取文件的完整路径
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file_path = os.path.join(directory, file)
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# 将图像文件转换为向量
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feature_vector = img_to_vector(file_path)
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# 将特征向量添加到列表中
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feature_list.append(feature_vector)
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# 获取文件名中的标签并添加到标签列表中
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label_list.append(int(file.split('_')[0]))
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# 将特征列表和标签列表转换为numpy数组
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feature_matrix = np.array(feature_list)
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label_array = np.array(label_list)
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# 特征缩放(归一化)
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min_value = np.min(feature_matrix)
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max_value = np.max(feature_matrix)
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feature_matrix = (feature_matrix - min_value) / (max_value - min_value)
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return feature_matrix, label_array
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# 这里还写自己的代码实现
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def img_to_vector(filename):
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