1.9. Classifiers

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

1.9.2. Schemat działania classifiera

  1. Collect Training Data

  2. Train Classifier

  3. Make Predictions

../../_images/classification-spam.png

Figure 1.31. Schemat działania classifiera. Wiadomości email przechodząc przez classifer są oznaczane jako spam, lub nie spam.