23.7.2 Candidates-based
Different models are better suited to different users or to different problems (see
Chapter 2). So both the choice of the training set (AL) and the choice of the model,
called Model Selection (MS), affect the predictive accuracy of the learned function.
There is in fact a strong dependency between AL and MS, meaning that useful points
for one model may not be as useful for another (Figure 23.9). This section discusses
how to perform AL with regards to multiple model candidates and the issues that
may arise when doing so.