Evaluation of the learned ROI embeddings using strength of 3HG’s multi-hop connections (defined in Section 2.5). (a) The strength of 3HG’s multi-hop connections calculated by the whole population with 1064 subjects; (b) the cosine similarity of each pair of the ROI embedding vectors learned by different multi-hop features (1-hop features, 2-hop features, and 3-hop features, respectively). For the matrices in both (a) and (b), the order of the brain regions is the same as the order defined in Destrieux atlas (Fischl et al. 1999), where most of the first 44 regions are gyri while the last 31 regions are sulci.