Table 1.

Definitions of symbols.

Symbol	Definition
X i	i-th data point
𝒳 l	Set of data points of the l-th class
𝒳 U	Set of unlabeled data points
z	Domain transfer representation of a data point
W l	Parameters of the CNN model of the l-th class
N i +	Intraclass neighborhood of the i-th data point
N i −	Interclass neighborhood of the i-th data point
A ij +	Intraclass affinity between the i-th and j-th data points
A ij′ +	Interclass affinity between the i-th and j′-th data points
π i	Domain indicator of the i-th data point
ω ij	Soft weight of the the j-th data point in the i-th neighborhood