A Practical Guide to Support Vector Classi cation
(a) Training data and an over tting classi er (b) Applying an over tting classi er on testing data (c) Training data and a better classi er (d) Applying a better classi er on testing data Figure 1: An over tting classi er and a better classi er (l and s: training data; and 4: testing data). grid-search approach.