This kind of neural network has been used in both computer vision (Koch et al., 2015) and natural language processing (Mueller and Thyagarajan, 2016;Neculoiu et al., 2016) in order to map two similar instances close in a feature space.
the works in (Gladkova et al., 2016;Vylomova et al., 2016) explore the use of word vectors to model the semantic relations.