将上述定义的函数结合起来，就是整个LR模型的执行过程 :param train_data: 训练数据集 :param train_label: 训练数据集的标签 :param test_data: 测试数据集 :param test_label: 测试数据集的标签 :param iterations: 迭代次数(epoch) :param learning_rate: 学习率 :return: 在测试数据集上的准确率
(train_data, train_label, test_data, test_label, iterations, learning_rate)
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