Machine Learning

Machine Learning 张万才

硅谷最看重的12项IT技能之首：机器学习 • 一种学习型算法

Outline • Linear regression • Multivariance Linear Regression • Logistic regression • Linear Regression with regularization • Regularized Logistic Regression

Authors： • 网易公开课 • Andrew Ng：吴恩达 (http://cs.stanford.edu/people/ang/) • 恩师：Michael I. Jordan • Latent dirichlet allocation：DM Blei, AY Ng, MI Jordan

linear regression • Cost Function • matlab函数介绍 • Legend • hold on, hold off • Linspace • logspace

linear regression • Gradient descent • Gradient descent algorithm

Multivariance Linear Regression • Gradient Descent: • Algorithm • Learning Rate • Polynomial Regression • Normal Equation

logistic regression • logistic function-sigmoid function • loss function • Gradient descentAlgorithm

logistic regression • Other optimization algorithms • Newton’s method

Multi-class Classification • one-vs-all

Linear Regression with regularization • Example • Addressing overfitting

Linear Regression with regularization • Regularization • Gradient descent update rules

Regularized Logistic Regression • Example • Regularized Logistic Regression: • Loss function and update rules Look identical to regulized linear regression

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Machine Learning