Fig. 5

Realization of the face recognition. a Recognition rate curve at different numbers of hidden neurons (32, 64, 128, and 256). b Recognition rate curve at 256 hidden neurons; the recognition rate reaches 100% after nearly 600 training-testing epochs. c The distribution of weight values after 10 to 90 (in steps of 20) training epochs. d The distribution of weight values after 100 to 600 (in steps of 100) training epochs. e Recognition rate after the replacement; the weight values were replaced after 100~500 training epochs (in steps of 100)