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

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