Week1: Machine Learning: A computer program is said to learn from experience E with respect to some class of tasks T and performance measure P, if its performance at tasks in T, as measured by P, improves with experience E. Supervised Learning:We alr…

Week 1: Machine Learning: A computer program is said to learn from experience E with respect to some class of tasks T and performance measure P, if its performance at tasks in T, as measured by P, improves with experience E. Supervised Learning:We al…

Machine Learning - Andrew Ng - Coursera Contents 1 Notes 1 Notes What is Machine Learning? Two definitions of Machine Learning are offered. Arthur Samuel described it as: "the field of study that gives computers the ability to learn without being exp…

/ 20220404 Week 1 - 2 / Chapter 1 - Introduction 1.1 Definition Arthur Samuel The field of study that gives computers the ability to learn without being explicitly programmed. Tom Mitchell A computer program is said to learn from experience E with re…

[1] ML Introduction a. supervised learning & unsupervised learning 监督学习:从给定的训练数据集中学习出一个函数(模型参数),当新的数据到来时,可以根据这个函数预测结果.监督学习的训练集要求包括输入输出,也可以说是特征和目标.训练集中的目标是由人标注的.常用于:训练神经网络.决策树.回归分析.统计分类 无监督学习:输入数据没有被标记,也没有确定的结果.样本数据类别未知,需要根据样本间的相似性对样本集进行分类,试图使类内差距最小化,…

主要内容: 一.Batch gradient descent 二.Stochastic gradient descent 三.Mini-batch gradient descent 四.Online learning 五.Map-reduce and data parallelism 一.Batch gradient descent batch gradient descent即在损失函数对θ求偏导时,用上了所有的训练集数据(假设有m个数据,且m不太大).这种梯度下降方法也是我们之前一直使用的.…

一.随机梯度下降算法 之前了解的梯度下降是指批量梯度下降:如果我们一定需要一个大规模的训练集,我们可以尝试使用随机梯度下降法(SGD)来代替批量梯度下降法. 在随机梯度下降法中,我们定义代价函数为一个单一训练实例的代价: 随机梯度下降算法为:首先对训练集随机“洗牌”,然后: 下面是随机梯度下降算法的过程以及和批量梯度下降算法的异同: 随机梯度下降算法是先只对第1个训练样本计算一小步的梯度下降,即这个过程包括调参过程,然后转向第2个训练样本,对第2个训练样本计算一小步的梯度下降,这个过程也包括调参…

一.开发与评价一个异常检测系统 异常检测算法是一个非监督学习算法,意味着我们无法根据结果变量…

学习曲线就是一种很好的工具,我经常使用学习曲线来判断某一个学习算法是否处于偏差.方差问题.学习曲线是学习算法的一个很好的合理检验(sanity check).学习曲线是将训练集误差和交叉验证集误差作为训练集实例数量(…

保存在github上供广大网友下载:点击 8个zip,原文件,没有任何改动. 另外,不定期上传我自己关于这门课的学习过程笔记和心得,有兴趣的盆友可以点击这里查看.…