全零初始化的问题: 在Linear Regression中,常用的参数初始化方式是全零,因为在做Gradient Descent的时候,各个参数会在输入的各个分量维度上各自更新.更新公式为: 而在Neural Network(Deep Learning)中,当我们将所有的parameters做全零初始化,根据公式: 可知,每一层的Zl均为0,如果使用sigmoid activation,则al的值都等于0.5.在反向传播时,误差值 因为有ω在里面,所以导致δ都变成了零,而我们用于做Gradien…

Decision Boundaries for Deep Learning and other Machine Learning classifiers H2O, one of the leading deep learning framework in python, is now available in R. We will show how to get started with H2O, its working, plotting of decision boundaries and…

边缘智能:按需深度学习模型和设备边缘协同的共同推理 本文为SIGCOMM 2018 Workshop (Mobile Edge Communications, MECOMM)论文. 笔者翻译了该论文.由于时间仓促,且笔者英文能力有限,错误之处在所难免:欢迎读者批评指正. 本文及翻译版本仅用于学习使用.如果有任何不当,请联系笔者删除. 本文作者包含3位,En Li, Zhi Zhou, and Xu Chen@School of Data and Computer Science, Sun Yat…

A Brief Overview of Deep Learning (This is a guest post by Ilya Sutskever on the intuition behind deep learning as well as some very useful practical advice. Many thanks to Ilya for such a heroic effort!) Deep Learning is really popular these days. B…

Rolling in the Deep (Learning) Deep Learning has been getting a lot of press lately, and is one of the hottest the buzz terms in Tech these days. Just check out one of the few recent headlines from Forbes, MIT Tech Review and you will surely see thes…

In the last chapter we learned that deep neural networks are often much harder to train than shallow neural networks. That's unfortunate, since we have good reason to believe that if we could train deep nets they'd be much more powerful than shallow…

前言: CNN作为DL中最成功的模型之一,有必要对其更进一步研究它.虽然在前面的博文Stacked CNN简单介绍中有大概介绍过CNN的使用,不过那是有个前提的:CNN中的参数必须已提前学习好.而本文的主要目的是介绍CNN参数在使用bp算法时该怎么训练,毕竟CNN中有卷积层和下采样层,虽然和MLP的bp算法本质上相同,但形式上还是有些区别的,很显然在完成CNN反向传播前了解bp算法是必须的.本文的实验部分是参考斯坦福UFLDL新教程UFLDL:Exercise: Convolutional Ne…

理论知识:Optimization: Stochastic Gradient Descent和Convolutional Neural Network CNN卷积神经网络推导和实现.Deep learning:五十一(CNN的反向求导及练习) Deep Learning 学习随记(八)CNN(Convolutional neural network)理解 ufldl学习笔记与编程作业:Convolutional Neural Network(卷积神经网络) [UFLDL]Exercise: Co…

Deep Learning in a Nutshell: History and Training This series of blog posts aims to provide an intuitive and gentle introduction to deep learning that does not rely heavily on math or theoretical constructs. The first part in this series provided an…

前言 理论知识:UFLDL教程.Deep learning:三十三(ICA模型).Deep learning:三十九(ICA模型练习) 实验环境:win7, matlab2015b,16G内存,2T机械硬盘 难点:本实验难点在于运行时间比较长,跑一次都快一天了,并且我还要验证各种代价函数的对错,所以跑了很多次. 实验内容:Exercise:Independent Component Analysis.从数据库Sampled 8x8 patches from the STL-10 dataset…