A survey on heterogeneous transfer learning

Journal of Big Data

Table 4 Other surveyed HTL methods

Methods	Category	Characteristics	Sections
HTLIC [22]	Unlabeled source, limited target	Image classification, bipartite graph, matrix factorization, unlabeled source of text and annotated images	“HTLIC”
aPLSA [96]	Unlabeled source and target	Unsupervised, image clustering, PLSA extension, annotated auxiliary images	“aPLSA”
DCN [103]	Preprocessing	Determine relatedness of domains using co-occurrence data, multi-source	“DCN”