Construction and representation of multiple bipartite graphs. (a) Construct a lncRNA-disease association bipartite graph based on the known associations between lncRNAs and diseases, and its’ matrix representation A. (b) Construct lncRNA-miRNA interactions bipartite graph based on the known lncRNA-miRNA interactions, and its’ matrix representation B. (c) Construct miRNA-disease association bipartite graph based on known miRNA-disease associations, and its’ matrix representation C. (d) Calculate the lncRNA similarity, and construct the matrix representation L. (e) Calculate the disease similarity, and construct the matrix representation D.