Binary Classifiers

• A binary classifier is a system that categorises an input as one of two classes.
• A simple system might be
  if wealth > 10000 then wealthy else poor
• That pretty simply classifies everyone based on a variable named wealth into two classes, either rich or poor.
• 
• Here's another class Xs and Os.
• It's just data.
• Given this data, how would you classify them?