Linear Separators
   - Remember lecture nine on
       
       classification with lines.
 
   - The idea is that a lot of categories can be categorised by lines.
 
   - That's lines in two dimensions, but planes and hyper-planes in
        higher dimensions
 
   - Also remember that the 
       
       classification with lines lecture considered outliers,
 
   - multiple class tasks,
 
   - and classes that weren't linearly separable.
 
   - It also referred to this lecture.