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We have a tag , which covers the more basic situation of two classes, but also that of multiple classes. The tag wiki is taken from Wikipedia:

Statistical classification is the problem of identifying the sub-population to which new observations belong, where the identity of the sub-population is unknown, on the basis of a training set of data containing observations whose sub-population is known. Therefore these classifications will show a variable behavior which can be studied by statistics.

However, we do get a number of questions on multi-class classification. A simple search for "multi" in the "classification" tag currently returns 607 hits.

I am kind of wondering whether it would make sense to introduce a new tag like "multi-classification". Or "multi-class-classification", which sounds more correct but also more cumbersome - anything as long as the tag shows up when people start typing "multi". Or do we assume that simply searching for "multi" in the "classification" tag is enough?

Thoughts, anyone?

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I don't think it's necessary. We already have & :

  • [multi-class] Wiki excerpt: "Multiclass classification is a classification task in which there are more than two classes. It is also called multinomial classification." 387 threads, 237 with [classification]
  • [multilabel] Wiki excerpt: "Multi-label classification where multiple target labels might be assigned to each instance." 162 threads, 82 with [classification]
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  • $\begingroup$ Duh. I'm sorry, I thought I had looked for such a tag, but obviously I missed it. $\endgroup$
    – Stephan Kolassa
    Nov 25, 2021 at 12:53
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    $\begingroup$ No need to apologize, @StephanKolassa. I found these because I already knew about them. $\endgroup$
    – gung - Reinstate Monica
    Nov 25, 2021 at 15:22

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