【李宏毅机器学习】1-机器学习介绍

What is Machine Learning

Machine Learning ≈ Looking for a Function From Data

• Speech Recognition

• Image Recognition

• Playing Go

• Dialogue System

Framework

Training

1. Define a set of function（Model）

2. Goodness of function f（Training Data： function input、function output）

   Pick the “Best” Function $f^{\ast }$

Testing

3. Using $f^{\ast }$ test

Learning Map

Task

Regression

The output of the target function f is “scalar”

Classification

• Binary Classification

  $Input\stackrel{Functionf}{}YesorNo$

• Multi-class Classification

​ $Input\stackrel{Functionf}{}Class1,Class2,...ClassN$

Model

Supervised Learning

• Linear Model

• Deep Learning

Semi-supervised Learning

Transfer Learning

Unsupervised Learning

Stuctured Learning

Beyond Classification

Reinforcement Learning

Learning from critics