forked from LufsX/Experiment-LogReg
This commit is contained in:
+33
-6
@@ -1,4 +1,3 @@
|
||||
# function.py
|
||||
import numpy as np
|
||||
|
||||
"""
|
||||
@@ -23,23 +22,32 @@ import numpy as np
|
||||
姓名请直接**填写中文**
|
||||
例如: name = "张三"
|
||||
"""
|
||||
id = "202210423xxx"
|
||||
name = "test_name"
|
||||
id = "202210423220"
|
||||
name = "方子涵"
|
||||
|
||||
|
||||
# 这里写自己的代码实现
|
||||
def train_logreg(X, y, other_params="你自己设置一些其它参数"):
|
||||
def train_logreg(X, y, learning_rate=0.01, iterations=1000):
|
||||
"""
|
||||
对率回归训练函数。
|
||||
|
||||
Args:
|
||||
- X (numpy array): 特征数据。
|
||||
- y (numpy array): 标签数据。
|
||||
- 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**。
|
||||
- learning_rate (float): 学习率,默认为0.01。
|
||||
- iterations (int): 迭代次数,默认为1000。
|
||||
|
||||
Returns:
|
||||
- numpy array: 训练得到的权重。
|
||||
"""
|
||||
m, n = X.shape
|
||||
weights = np.zeros(n)
|
||||
for _ in range(iterations):
|
||||
linear_model = np.dot(X, weights)
|
||||
y_predicted = 1 / (1 + np.exp(-linear_model))
|
||||
gradient = np.dot(X.T, (y_predicted - y)) / m
|
||||
weights -= learning_rate * gradient
|
||||
return weights
|
||||
|
||||
|
||||
def predict_logreg(inX, weights):
|
||||
@@ -53,6 +61,9 @@ def predict_logreg(inX, weights):
|
||||
Returns:
|
||||
- int: 预测的分类标签。
|
||||
"""
|
||||
linear_model = np.dot(inX, weights)
|
||||
y_predicted = 1 / (1 + np.exp(-linear_model))
|
||||
return 1 if y_predicted > 0.5 else 0
|
||||
|
||||
|
||||
# 这里也写自己的代码实现
|
||||
@@ -61,18 +72,34 @@ def load_data(filepath):
|
||||
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**。
|
||||
|
||||
Args:
|
||||
- directory (str): 数据文件路径。
|
||||
- filepath (str): 数据文件路径。
|
||||
|
||||
Returns:
|
||||
- np.array: 特征数据。
|
||||
- np.array: 标签数据。
|
||||
"""
|
||||
with open(filepath, 'r') as file:
|
||||
lines = file.readlines()
|
||||
features = []
|
||||
labels = []
|
||||
for line in lines:
|
||||
parts = line.strip().split(',')
|
||||
label = int(parts[-1])
|
||||
features.append([float(x) for x in parts[:-1]])
|
||||
labels.append(label)
|
||||
return np.array(features), np.array(labels)
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
# 以下代码可用于测试,可自行随意修改
|
||||
# 加载训练集
|
||||
X_train, y_train = load_data("./data/horse-colic.data")
|
||||
# 训练模型
|
||||
weights = train_logreg(X_train, y_train)
|
||||
# 预测
|
||||
predictions = [predict_logreg(X_train[i], weights) for i in range(X_train.shape[0])]
|
||||
# 打印预测结果
|
||||
print(predictions)
|
||||
|
||||
# 加载测试集
|
||||
X_test, y_test = load_data("./data/horse-colic.test")
|
||||
|
||||
Reference in New Issue
Block a user