One Vs Rest Or One Vs All Multi Class Classification
This method is used to extend a binary class classifier to classify multiple classes.
So for $K$ classes, we will train $K$ models
- 1 model for each class
- And for model $i$, it will predict if the instance is of class $i$ or not
- In other way, class $i$ is fighting with all other or rest of the classes
- Thats why it is called one-vs-rest or one-vs-all method
- The final prediction is the $argmax$ of the all pr