2.9. Classifiers

2.9.1. Co to jest Classifier?

A mapping from unlabeled instances to (discrete) classes. Classifiers have a form (e.g., decision tree) plus an interpretation procedure (including how to handle unknowns, etc.). Some classifiers also provide probability estimates (scores), which can be threshold to yield a discrete class decision thereby taking into account a utility function.

2.9.2. Schemat działania classifier

1. Collect Training Data

2. Train Classifier

3. Make Predictions

Figure 2.52. Schemat działania classifier. Wiadomości email przechodząc przez classifier są oznaczane jako spam, lub nie spam.