machine learning by Andrew NG(1)/Introduction

today we will talk about three topics. - what ‘s machine learning? - supervise learning & unsupervised learning

where we can find machine learning? A: machine learning is everywhere. you may not realize you are using machine learning when you use it.

one of the most important application of machine learning is AI.

examples:

database mining web click medical record biology engineering

applications can not PRogram by hand autonomous helicopter handwriting recognition NPL CV

self-customizing amazon and netflix recommendation

understand human learning(brain,real AI)

what’s machine learning?

machine learning algorithm classification:

supervised learning

example1: housing price prediction this is also a regression problem.

example2: Breast cancer this is also a classification problem.

extension: multi-features classification problem. how to deal with infinite features or attributes? A: SVM

unsupervised learning not give the right answers

example:

application:

others: Reinforcement learning recommender systems