构造函数 :param data_matrix: 数据的特征向量 :param label_matrix: 数据的标签类别 :param iteration: 迭代次数,默认为100 :param learning_rate: 学习率，默认为0.001
(self, data_matrix, label_matrix, iteration=30, learning_rate=0.0001)
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nothing calls this directly
no outgoing calls
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