论文: Multi-Fidelity Automatic Hyper-Parameter Tuning via Transfer Series Expansion 我们都知道实现AutoML的基本思路是不断选取不同的超参数组成一个网络结构,然后使用这个网络结构在整个数据集上进行评估 (假设评估值为\(f_H(X)=\mathcal{L}(δ,D^{train},D^{valid})\),X表示某一组超参数) ,最后选择出评估性能最好的网络参数. 但是基于full dataset进行评估cost太…

How to Evaluate Machine Learning Models, Part 4: Hyperparameter Tuning In the realm of machine learning, hyperparameter tuning is a “meta” learning task. It happens to be one of my favorite subjects because it can appear like black magic, yet its sec…

第三周:Hyperparameter tuning, Batch Normalization and Programming Frameworks 调试处理(Tuning process) 目前为止,你已经了解到,神经网络的改变会涉及到许多不同超参数的设置.现在,对于超参数而言,你要如何找到一套好的设定呢?在本节中,我想和你分享一些指导原则,一些关于如何系统地组织超参调试过程的技巧,希望这些能够让你更有效的聚焦到合适的超参设定中. 关于训练深度神经网络最难的事情之一是你要处理的参数的数量,下面粗…

About this Course This course will teach you the "magic" of getting deep learning to work well. Rather than the deep learning process being a black box, you will understand what drives performance, and be able to more systematically get good res…

Lesson 2 Improving Deep Neural Networks:Hyperparameter tuning, Regularization and Optimization 这篇文章其实是 Coursera 上吴恩达老师的深度学习专业课程的第二门课程的课程笔记. 参考了其他人的笔记继续归纳的. 训练,验证,测试集 (Train / Dev / Test sets) 在机器学习发展的小数据量时代,常见做法是将所有数据三七分,就是人们常说的 70% 训练集,30% 测试集.如果明确设…

Tuning process 下图中的需要tune的parameter的先后顺序, 红色>黄色>紫色,其他基本不会tune. 先讲到怎么选hyperparameter, 需要随机选取(sampling at random) 随机选取的过程中,可以采用从粗到细的方法逐步确定参数 有些参数可以按照线性随机选取, 比如 n[l] 但是有些参数就不适合线性的sampling at radom, 比如 learning rate α,这时可以用 log Andrew 很幽默的讲到了两种选参数的实际场景…

声明:所有内容来自coursera,作为个人学习笔记记录在这里. 请不要ctrl+c/ctrl+v作业. Optimization Methods Until now, you've always used Gradient Descent to update the parameters and minimize the cost. In this notebook, you will learn more advanced optimization methods that can spee…

Optimization Welcome to the optimization's programming assignment of the hyper-parameters tuning specialization. There are many different optimization algorithms you could be using to get you to the minimal cost. Similarly, there are many different p…

声明:所有内容来自coursera,作为个人学习笔记记录在这里. Regularization Welcome to the second assignment of this week. Deep Learning models have so much flexibility and capacity that overfitting can be a serious problem, if the training dataset is not big enough. Sure it do…

超参数调整 详细可以参考官方文档 定义 在拟合模型之前需要定义好的参数 适用 Linear regression: Choosing parameters Ridge/lasso regression: Choosing alpha k-Nearest Neighbors: Choosing n_neighbors Parameters like alpha and k: Hyperparameters Hyperparameters cannot be learned by tting the…

Week 1 Quiz - Practical aspects of deep learning(第一周测验 - 深度学习的实践) \1. If you have 10,000,000 examples, how would you split the train/dev/test set? (如果你有 10,000,000 个样本,你会如何划分训练/开发/测试集?) [ ]98% train . 1% dev . 1% test(训练集占 98% , 开发集占 1% , 测试集占 1%) 答案…

训练.验证.测试划分的量要保证数据来自一个分布偏差方差分析如果存在high bias如果存在high variance正则化正则化减少过拟合的intuitionDropoutdropout分析其它正则化方法数据增加(data augmentation)early stoppingensemble归一化输入归一化可以加速训练归一化的步骤归一化应该应用于:训练.验证.测试梯度消失/爆炸权重初始化通过数值近似计算梯度优化算法mini-batchmomentumRMSpropAdam调参顺序批规范化Ba…

1. Setting up your Machine Learning Application 1.1 训练,验证,测试集(Train / Dev / Test sets) 1.2 Bias/Variance(偏差和方差) 高偏差(high bias)称为"欠拟合"(underfitting), 练集误差与验证集误差都高. 高方差(high variance)称为过拟合(overfitting), 训练集误差很低而验证集误差很高. 1.3 Basic "recipe"…

Gradient descent Batch Gradient Decent, Mini-batch gradient descent, Stochastic gradient descent 还有很多比gradient decent 更优化的算法,在了解这些算法前,需要先理解  Exponentially weighted averages 这个概念 Exponentially weighted average 是一种计算平均值的方法,非常省storage 和 memory, 但是不是很精确.…

声明:所有内容来自coursera,作为个人学习笔记记录在这里. Gradient Checking Welcome to the final assignment for this week! In this assignment you will learn to implement and use gradient checking. You are part of a team working to make mobile payments available globally, and…

声明:所有内容来自coursera,作为个人学习笔记记录在这里. Initialization Welcome to the first assignment of "Improving Deep Neural Networks". Training your neural network requires specifying an initial value of the weights. A well chosen initialization method will help…

Train/Dev/Test set Bias/Variance Regularization  有下面一些regularization的方法. L2 regularation drop out data augmentation(翻转图片得到一个新的example), early stopping(画出J_train 和J_dev 对应于iteration的图像) L2 regularization: Forbenius Norm. 上面这张图提到了weight decay 的概念 Weigh…

Tensorflow Welcome to the Tensorflow Tutorial! In this notebook you will learn all the basics of Tensorflow. You will implement useful functions and draw the parallel with what you did using Numpy. You will understand what Tensors and operations are,…

Gradient Checking Welcome to this week's third programming assignment! You will be implementing gradient checking to make sure that your backpropagation implementation is correct. By completing this assignment you will: - Implement gradient checking…

第一周:深度学习的实践层面 (Practical aspects of Deep Learning) 1.1 训练,验证,测试集(Train / Dev / Test sets) 创建新应用的过程中,不可能从一开始就准确预测出一些信息和其他超级参数,例如:神经网络分多少层:每层含有多少个隐藏单元:学习速率是多少:各层采用哪些激活函数.应用型机器学习是一个高度迭代的过程. 从一个领域或者应用领域得来的直觉经验,通常无法转移到其他应用领域,最佳决策取决于 所拥有的数据量,计算机配置中输入特征的数量,…

HOME ABOUT CONTACT SUBSCRIBE VIA RSS   DEEP LEARNING FOR ENTERPRISE Distributed Deep Learning, Part 1: An Introduction to Distributed Training of Neural Networks Oct 3, 2016 3:00:00 AM / by Alex Black and Vyacheslav Kokorin Tweet inShare27   This pos…

http://deeplearning4j.org/lstm.html A Beginner’s Guide to Recurrent Networks and LSTMs Contents Feedforward Networks Recurrent Networks Backpropagation Through Time Vanishing and Exploding Gradients Long Short-Term Memory Units (LSTMs) Capturing Dive…

Gradient Boosted Regression Trees 2   Regularization GBRT provide three knobs to control overfitting: tree structure, shrinkage, and randomization. Tree Structure The depth of the individual trees is one aspect of model complexity. The depth of the t…

A Gentle Introduction to the Gradient Boosting Algorithm for Machine Learning by Jason Brownlee on September 9, 2016 in XGBoost 0 0 0 0   Gradient boosting is one of the most powerful techniques for building predictive models. In this post you will d…

How to Configure the Gradient Boosting Algorithm by Jason Brownlee on September 12, 2016 in XGBoost 0 0 0 0   Gradient boosting is one of the most powerful techniques for applied machine learning and as such is quickly becoming one of the most popula…

At some fundamental level, no one understands machine learning. It isn’t a matter of things being too complicated. Almost everything we do is fundamentally very simple. Unfortunately, an innate human handicap interferes with us understanding these si…

We are happy to finally announce the first release of mlrMBO on cran after a quite long development time. For the theoretical background and a nearly complete overview of mlrMBOs capabilities you can check our paper onmlrMBO that we presubmitted to a…

因为是Jupyter Notebook的形式,所以不方便在博客中展示,具体可在我的github上查看. 第一章 Neural Network & DeepLearning week2 Logistic Regression with a Neural Network mindset v3.ipynb 很多朋友反映找不到h5文件,我已经上传了,具体请戳h5文件 week3 Planar data classification with one hidden layer v3.ipynb week4…

AutoML for Data Augmentation 2019-04-01 09:26:19 This blog is copied from: https://blog.insightdatascience.com/automl-for-data-augmentation-e87cf692c366   DeepAugment is an AutoML tool focusing on data augmentation. It utilizes Bayesian optimization…

https://blog.csdn.net/class_brick/article/details/79311148 今天的内容有: LSTM 思路 LSTM 的前向计算 LSTM 的反向传播 关于调参 LSTM 长短时记忆网络(Long Short Term Memory Network, LSTM),是一种改进之后的循环神经网络,可以解决RNN无法处理长距离的依赖的问题,目前比较流行. 长短时记忆网络的思路: 原始 RNN 的隐藏层只有一个状态,即h,它对于短期的输入非常敏感. 再增加一个状…