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FortiLeiZhang / Cs231n

Stanford cs231n'18 assignment

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Stanford cs231n'18

Stanfor cs231n是一门介绍CNN基础概念和知识的课程。这一课程前半部分的重点在于介绍组成CNN的各种模块,包括FC, Conv, Relu, BN等等。特别是在它的assignment1和2中,作者很用心的一步一步、循序渐进的带领初学者动手编程实现每一个模块。这样,在平时的工作中,我们不但可以像搭积木一样,将这些模块一层一层的叠加起来组成我们的CNN,更重要的是,我们可以更深入的了解数据在这些模块中是怎样流动的,以及梯度又是如何在这些模块中backpropagate的。基于此,在这里将学习cs231n课程中的学习心得记录下来,内容包括:

  1. 各个模块backpropagation公式的推导过程,以及在编写程序中遇到的问题解决过程。这一点很重要,因为在以后的工作中,不论是使用TensorFlow还是PyTorch,我们只需要考虑forward过程来搭建CNN,至于梯度如何backpropagate,软件会自动帮我们处理好。所以我们只知道CNN会backpropagation,但很少有机会知道它是怎样backpropagation的。而这门课程恰恰可以让我们了解每一个CNN模块backpropagation的公式推导及编程实现,这对今后处理梯度消失/爆炸的问题会很有帮助。
  2. 学习作者调试CNN模块的思路和流程,包括初始值的检验,gradie check,minibatch overfitting等等。如1所述,即使我们知道了CNN的梯度是如何计算的,CNN搭建起来是如何验证的,但将它编程实现又是另外一个问题,这里面有很多细节值得我们注意。基于此,这里将按照作业的流程将其中出现的所有函数自己动手写一遍,深入了解一下作者搭建调试CNN网络的过程。

Lecture 1

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