generated from LufsX/Experiment-kNN
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+43
-4
@@ -25,8 +25,8 @@ import os
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"""
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请在这里填写学号和姓名,不填写即成绩无效。
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"""
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id = "202210423xxx"
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name = "test_name"
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id = "202210423119"
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name = "肖锐"
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"""
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@@ -41,7 +41,7 @@ name = "test_name"
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# 这里写自己的代码实现
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def classify(input_vector, dataSet, labels, k=0):
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def classify(input_vector, dataSet, labels, k=3):
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"""
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KNN 分类算法。
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@@ -54,9 +54,26 @@ def classify(input_vector, dataSet, labels, k=0):
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Returns:
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- int: 预测的分类标签。
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"""
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"""
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使用欧式距离的 kNN 分类算法。
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"""
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# 计算欧式距离
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distances = np.linalg.norm(dataSet - input_vector, axis=1)
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# 获取距离最近的 k 个样本的索引
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k_indices = np.argsort(distances)[:k]
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# 获取最近邻样本的标签
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k_nearest_labels = [labels[i] for i in k_indices]
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# 找出出现次数最多的标签
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most_common = max(set(k_nearest_labels), key=k_nearest_labels.count)
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return most_common
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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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"""
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从文件夹中加载数据,若不自行正确实现,则无法通过评测,**不记录成绩**。
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@@ -68,6 +85,24 @@ def load_dataset(directory):
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- np.array: 特征数据。
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- np.array: 标签数据。
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"""
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features = []
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labels = []
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# 遍历文件夹中的所有文件
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for filename in os.listdir(directory):
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if filename.endswith(".txt"): # 假设文件是 .txt 格式
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filepath = os.path.join(directory, filename)
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# 假设文件名格式为 "数字_编号.txt"
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label = int(filename.split('_')[0])
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# 加载文件中的二进制数据并转换为 1D 向量
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image_vector = img_to_vector(filepath)
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features.append(image_vector)
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labels.append(label)
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return np.array(features), np.array(labels)
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# 这里还写自己的代码实现
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@@ -82,7 +117,11 @@ def img_to_vector(filename):
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Returns:
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- np.array: 二值图像向量。
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"""
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with open(filename) as file:
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lines = file.readlines()
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image_vector = np.array([int(char) for line in lines for char in line.strip()])
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return image_vector
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if __name__ == "__main__":
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# 以下代码可用于测试,可自行随意修改
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