Table 2.

Summary of the terminology and notation used throughout the manuscript

Symbol	Explanation
c i	a concept
C	a set of concepts
l	a label representing a relation
R l	binary relation with label l
(c i,l,c j)/triple	a pair of concepts (c i,c j) connected by relation with label l
R	a set of triples
G	the knowledge graph
P	a path in G
f	a feature vector
E +/ E −	a set of positive/negative examples
θ	set of model parameters
X	observable variables or observations defined by a model
H	hidden or latent variables defined by a model