[gwern]

Tagging/multi-label classification is useful because it'll help tame your explosion of classification if you want to expand. For example, it can then handle stuck-together parts by tagging it as both parts rather than putting them into a generic 'other' classification, or you could include separate tags for colors or fakeness or damagedness, avoiding the need for 100,000 categories of 'fake damaged red square brick' etc. It might also improve learning since it's a more natural way of describing the data.