*2.3.6 Network models*

The various interaction patterns such as protein-protein, drug-disease, diseasegene, drug-target, drug-drug, disease-disease and transcriptomes and cell signaling networks are usually procured from different databases, which are interpreted computationally. The network models represent each and everything like drug, disease, gene and related products and their interaction patterns, for example, nodes (drug, disease and genes) and edges (interaction patterns of nodes). Network models are divided in to two types, these includes: network-based cluster approaches and network-based propagation approaches [19].
