8. Classifiers

8.1. 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 thresholded to yield a discrete class decision thereby taking into account a utility function.

8.2. Schemat działania classifiera

  1. Collect Training Data
  2. Train Classifier
  3. Make Predictions
../_images/classification-spam.png

Fig. 8.1. Schemat działania classifiera. Wiadomości email przechodząc przez classifer są oznaczane jako spam, lub nie spam.