A class label is the category assigned to an example in a classification problem. The example’s attributes provide clues; the label is the answer the classifier must choose. section 8.14
Which kind of device?
Suppose a device has a screen size, weight, and operating system. Those are its attributes. “Tablet,” “laptop,” and “phone” are possible class labels. Classifying the device means choosing among those categories. section 8.15
Ask what kind of answer you need. Deciding whether an animal is a bird is classification: “bird” and “not a bird” are labels. Predicting a diamond’s price from its carat value is regression: the answer is an estimated value, not a class label. section 8.15 section 8.11 section 8.14
