generated from LufsX/Experiment-LogReg
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+22
-12
@@ -1,4 +1,3 @@
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# function.py
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import numpy as np
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"""
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@@ -17,28 +16,34 @@ import numpy as np
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- numpy: 2.1.1
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"""
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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 = "202210423228"
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name = "黎世浩"
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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 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,默认为0.01。
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- iterations (int): 迭代次数,默认为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)
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for i in range(iterations):
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linear_model = np.dot(X, weights)
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y_predicted = 1 / (1 + np.exp(-linear_model))
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gradient = np.dot(X.T, (y_predicted - 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 +56,9 @@ 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)
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y_predicted = 1 / (1 + np.exp(-linear_model))
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return 1 if y_predicted > 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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@@ -59,13 +66,16 @@ 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 = np.loadtxt(filepath, delimiter=',', dtype=float)
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X = data[:, :-1]
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y = (data[:, -1] > 0.5).astype(int) # Assuming the last column is the label
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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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@@ -80,4 +90,4 @@ if __name__ == "__main__":
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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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print(f"预测结果: {y_pred}, 实际结果: {y_test[11]}")
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