Table 2
Summary of transfer operations defined in the compared models, where we assume the direction of transfer is from 1 to 2.
ModelDocument levelWord levelParameters of h
LDA α $β(ℓ2)$ —

doclink $δ⋅N(ℓ1)+α$ $β(ℓ2)$ δ: indicator vector;

$δ⋅N(ℓ1)+α$ $N(ℓ1)$: doc-by-topic matrix;

c-bilda $δ⋅Nk(ℓ1)+χ(d)$ $β(ℓ2)$ supervision: comparable documents;
δ: transfer distribution;

softlink $δ⋅N(ℓ1)+α$ $β(ℓ2)$ $N(ℓ1)$: doc-by-topic matrix;
supervision: dictionary;
δ: indicator vector;

voclink α $δ⋅N(ℓ1)+β(r,ℓ2)$ $N(ℓ1)$: node-by-word matrix;
supervision: dictionary;
ModelDocument levelWord levelParameters of h
LDA α $β(ℓ2)$ —

doclink $δ⋅N(ℓ1)+α$ $β(ℓ2)$ δ: indicator vector;

$δ⋅N(ℓ1)+α$ $N(ℓ1)$: doc-by-topic matrix;

c-bilda $δ⋅Nk(ℓ1)+χ(d)$ $β(ℓ2)$ supervision: comparable documents;
δ: transfer distribution;

softlink $δ⋅N(ℓ1)+α$ $β(ℓ2)$ $N(ℓ1)$: doc-by-topic matrix;
supervision: dictionary;
δ: indicator vector;

voclink α $δ⋅N(ℓ1)+β(r,ℓ2)$ $N(ℓ1)$: node-by-word matrix;
supervision: dictionary;
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