generated from LufsX/Experiment-LogReg
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+25
-6
@@ -21,12 +21,14 @@ 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 = "202210423108"
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name = "雷武"
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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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@@ -38,9 +40,21 @@ 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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bias = 0
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for i in range(iterations):
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linear_model = np.dot(X, weights) + bias
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y_pred = sigmoid(linear_model)
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dw = (1 / m) * np.dot(X.T, (y_pred - y))
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db = (1 / m) * np.sum(y_pred - y)
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def predict_logreg(inX, weights):
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weights -= learning_rate * dw
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bias -= learning_rate * db
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return weights, bias
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def predict_logreg(inX, weights, bias):
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"""
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对率回归预测函数。
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@@ -51,7 +65,9 @@ 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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linear_model = np.dot(inX, weights) + bias
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y_pred = sigmoid(linear_model)
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return 1 if y_pred >= 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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@@ -65,7 +81,10 @@ 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 = np.loadtxt(filepath, delimiter=',')
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X = data[:, :-1]
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y = data[:, -1].astype(int)
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return X, y
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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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