generated from LufsX/Experiment-LogReg
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+26
-2
@@ -21,11 +21,15 @@ 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 = "202210423124"
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name = "刘子豪"
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# 这里写自己的代码实现
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def sigmoid(z):
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return 1 / (1 + np.exp(-z)) #用于将数据转化成一个0 - 1之间的概率值
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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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"""
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对率回归训练函数。
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@@ -38,6 +42,14 @@ def train_logreg(X, y, other_params="你自己设置一些其它参数"):
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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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predictions = sigmoid(np.dot(X, weights))
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errors = y - predictions
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gradient = np.dot(X.T, errors) / 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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@@ -51,6 +63,8 @@ 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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@@ -65,6 +79,16 @@ def load_data(filepath):
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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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fields = line.strip().split()
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if '?' in fields:
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continue # 跳过包含缺失值的行
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data.append([float(x) for x in fields[:-1]])
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labels.append(int(fields[-1])) # 假设标签在最后一列
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return np.array(data), np.array(labels)
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if __name__ == "__main__":
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