Labelling is the process of giving data items some form of label, often a classification. In supervised machine learning, human labelling is often necessary for training, but sometimes there may be an automatic labelling, for example, if there are multiple kinds of sensors, or post-hoc knowledge about outcomes. The execution phase of machine learning often involves allocating labels to unlabelled data.
Used on Chap. 9: pages 194, 195; Chap. 12: page 265; Chap. 20: page 495