generated from LufsX/Experiment-LogReg
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+36
-10
@@ -21,24 +21,35 @@ import numpy as np
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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 = "202210423213"
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name = "熊浩燃"
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# 这里写自己的代码实现
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def train_logreg(X, y, other_params="你自己设置一些其它参数"):
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def sigmoid(z):
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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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- other_params (str): 其它参数,可选设置。若需设置其它参数,必须设置其默认值,否则将**无法通过**自动评测,**成绩为零**。
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- learning_rate (float): 学习率。
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- iterations (int): 迭代次数。
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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)
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for _ in range(iterations):
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z = np.dot(X, weights)
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h = sigmoid(z)
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gradient = np.dot(X.T, (h - y)) / m
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weights -= learning_rate * gradient
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return weights
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def predict_logreg(inX, weights):
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"""
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@@ -51,7 +62,8 @@ def predict_logreg(inX, weights):
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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
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# 这里也写自己的代码实现
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def load_data(filepath):
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@@ -59,19 +71,33 @@ def load_data(filepath):
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从文件中加载数据,若不自行正确实现,则无法通过评测,**不记录成绩**。
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Args:
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- directory (str): 数据文件路径。
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- filepath (str): 数据文件路径。
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Returns:
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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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data = []
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labels = []
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with open(filepath, 'r') as file:
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for line in file:
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line_data = line.strip().split()
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if '?' not in line_data: # 忽略缺失值的行
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data.append([float(x) for x in line_data[:-1]])
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labels.append(int(float(line_data[-1])))
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return np.array(data), np.array(labels)
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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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# 加载训练集
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# 测试数据加载和模型训练预测
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X_train, y_train = load_data("./data/horse-colic.data")
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X_test, y_test = load_data("./data/horse-colic.test")
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# 训练对率回归模型
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weights = train_logreg(X_train, y_train, learning_rate=0.01, iterations=1000)
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# 测试单个数据
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y_pred = predict_logreg(X_test[11], weights)
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print(f"预测结果: {y_pred}, 实际结果: {y_test[11]}")
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# 加载测试集
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X_test, y_test = load_data("./data/horse-colic.test")
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