About

Multiclass classification is used to predict:

• one of three or more possible outcomes
• and the likelihood of each one.

Generally, there is no notion of closeness because the target class is nominal. See nominal measurement

Example

• Is this product a book, a movie, or an article of clothing?
• Is this movie a comedy, a documentary, or a thriller?
• Which category of products is of most interest to this customer?

Documentation / Reference

• Amazon Machine Learning – Make Data-Driven Decisions at Scale