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TableĀ 1 Summary of commonly used notation

From: A survey of transfer learning

Notation Description Notation Description
\({\mathcal{X}}\) Input feature space P (X) Marginal distribution
\({\mathcal{Y}}\) Label space P (Y|X) Conditional distribution
\({\mathcal{T}}\) Predictive learning task P (Y) Label distribution
Subscript S Denotes source DS Source domain data
Subscript T Denotes target DT Target domain data