Table 1 Summary of commonly used notation

\({\mathcal{X}}\)

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

D_S

Source domain data

Subscript T

Denotes target

D_T

Target domain data