Mastering Machine Learning with scikit-learn - Second Edition

Kernels and the kernel trick

Recall that the perceptron separates instances of the positive class from instances of the negative class using a hyperplane as a decision boundary. The decision boundary is given by the following formula:

Predictions are made using the following function:

Note that we previously indicated the inner productwith wTx. To be consistent with the notational conventions used for SVM, we will adopt the former in this chapter. ...