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The current version of the page mixes two different concepts: multi-label classification and multi-class classification. The two are not exclusive but at the same time are NOT equivalent. In multi-class classification, each input is assigned a single output class out of multiple possible output classes. This is in contrast to the simpler problem of binary classification where just two output classes are allowed. On the other hand, multi-label classification does not assign just a single output label but rather a subset of output labels to each input. The article was originally on multi-class and there are links pointing to it as such, so imho, the multi-label part should be (re)moved. Tomash (talk) 17:24, 13 September 2011 (UTC)
I agree. Multi-label classification should be put somewhere else, possible even a new topic. Some further info is hereDcorney (talk) 12:49, 20 September 2011 (UTC)
Rewrote the article, see below. Qwertyus (talk) 11:34, 27 October 2011 (UTC)
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I entirely rewrote this article, removing most of the information contained here. Not only was the article previously wrong in conflating multiclass and multi-label learning, it also seemed to have been copy-pasted of the PDF linked above. (Which, btw., is one CiteSeer, but looks to me like an unreviewed manuscript, so I haven't cited it or covered its use of "multiclass" to refer to what is commonly known as "multi-label".) Qwertyus (talk) 11:34, 27 October 2011 (UTC)