1. Domain adaptation vs. transfer learning

    The standard classification setting is a input distribution p(X) and a label distribution p(Y|X). Roughly speaking, domain adaptation (DA) is the problem that occurs when p(X) changes between training and test. Transfer learning (TL) is the problem that occurs when p(Y|X) changes between training and test. In other words, in DA the input distribution changes but the labels remain the same; in TL, the input distributions stays the same, but the labels change. The two problems are clearly quite si
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