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While PCA can be useful for some classification problems, it is intended to be a dimensionality reduction technique, not a classification technique.
by epgui 5y ago
While PCA can be useful for some classification problems, it is intended to be a dimensionality reduction technique, not a classification technique.
- jnwatson 5y agoThat’s what confused me.
- PaulHoule 5y agoIf you're trying to make a classifier, have a crazy high dimensional space, and don't have a lot of training examples, dimensional reduction can be a lifesaver. With simple text classification problems (is this a biomedical abstract or celebrity gossip?) and bag-of-words features I've seen dimensional reduction cut the error rate in half.