neural networks and deep learning-chapter1-3
使用梯度下降算法进行学习 现在我们有了一个神经网络，接下来我们需要的就是一个训练数据集。该书采用的是 MNIST 数据集。 我们希望能够找到合适的一组权重及偏置，使得数据能够全部被正确地分类。为了量化我们与这个目标的距离，我们定义一个代价函数(也被称为损失函数或目标函数)： 
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