“…However, there are no connections between the input layer nodes and the output layer nodes in ELM. Fortunately, a double parallel structure mentioned in previous work (He et al, 2015a,b;He and Huang, 2005;Yao et al, 2011) can be adopted to solve this problem. The double parallel structure can enable the output layer nodes to not only receive the information from the hidden layer nodes but also receive the direct information from the input nodes, which can enhance the performance of networks (He et al, 2015a,b).…”