generated from LufsX/Experiment-LogReg
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+24
-46
@@ -26,47 +26,6 @@ name = "邓龙树"
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import numpy as np
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import numpy as np
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def sigmoid(z):
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"""计算sigmoid函数"""
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return 1 / (1 + np.exp(-z))
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def train_logreg(X, y, learning_rate=0.01, iterations=1000):
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"""
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对率回归训练函数。
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Args:
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- X (numpy array): 特征数据。
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- y (numpy array): 标签数据。
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- learning_rate (float): 学习率,默认值为0.01。
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- iterations (int): 迭代次数,默认值为1000。
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Returns:
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- numpy array: 训练得到的权重。
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"""
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m, n = X.shape
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weights = np.zeros(n) # 初始化权重
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for _ in range(iterations):
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z = np.dot(X, weights)
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predictions = sigmoid(z)
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error = predictions - y
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gradient = np.dot(X.T, error) / m
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weights -= learning_rate * gradient # 更新权重
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return weights
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def predict_logreg(inX, weights):
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"""
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对率回归预测函数。
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Args:
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- inX (numpy array): 输入待分类的样本。
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- weights (numpy array): 训练得到的权重。
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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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probability = sigmoid(np.dot(inX, weights))
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return 1 if probability >= 0.5 else 0 # 二分类阈值为0.5
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def load_data(filepath):
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def load_data(filepath):
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"""
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"""
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从文件中加载数据。
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从文件中加载数据。
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@@ -78,17 +37,36 @@ def load_data(filepath):
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- np.array: 特征数据。
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- np.array: 特征数据。
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- np.array: 标签数据。
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- np.array: 标签数据。
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"""
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"""
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# 使用dtype=str先将所有数据加载为字符串
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# 读取每一行作为字符串
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data = np.loadtxt(filepath, delimiter=' ', dtype=str)
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with open(filepath, 'r') as file:
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lines = file.readlines()
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# 替换'?'为np.nan,并转换为浮点数
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# 分割每一行并填充缺失的列
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data[data == '?'] = np.nan
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max_cols = 0
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data = data.astype(float)
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rows = []
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for line in lines:
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# 分割每一行
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cols = line.strip().split(' ')
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# 记录最大列数
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max_cols = max(max_cols, len(cols))
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rows.append(cols)
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# 将所有行填充到相同的列数
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for row in rows:
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while len(row) < max_cols:
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row.append('nan')
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# 转换为numpy数组
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data = np.array(rows, dtype=float)
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# 用np.nan替换字符串'nan'
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data[data == 'nan'] = np.nan
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X = data[:, :-1] # 假设最后一列是标签
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X = data[:, :-1] # 假设最后一列是标签
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y = data[:, -1]
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y = data[:, -1]
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return X, y
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return X, y
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if __name__ == "__main__":
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if __name__ == "__main__":
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# 加载训练集
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# 加载训练集
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X_train, y_train = load_data("./data/horse-colic.data")
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X_train, y_train = load_data("./data/horse-colic.data")
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