What is machine learning?

Field of study that gives computers the ability to learn without being explicitly programmed

A computer program is said to learn from experience E with respect to some task T and some performance measure P, if its performance on T, as measured by P, improves with experience E.

Types of machine learning.

• Supervised - teach the computer how to do something.
• Unsupervised - computer learns by itself.
• Reinforced Learning.
• Recommender systems.

Supervised learning

• Classification problems where output is from set of discrete values.
  • Email is spam or not.
• Regression problems where result is within a continuous output.
  • House prices.

Unsupervised learning

• Structure of the data is unknown.
• Used to determine structure of the data and derive features.

Linear regression with one variable

Cost function

Gradient descent

Gradient descent for linear regression