Data prediction is one of the key problems for precision measurement and control. The data obtained by measuring
system are often limited. To solve the small sample problem, the BP neural network methods are widely used. However,
because of too many input factors and complex data training process, the convergence speed of the BP neural network
method is slow. To increase the convergence speed, some grey relational analysis methods were introduced into the BP
neural network methods. The grey relational coefficients were calculated first. And by sorting the grey relational
coefficients, some factors with less relationship were removed form the BP neural network's inputs. Through the
preliminary theory and experiment analysis, the data prediction under small sample could be fulfilled in accuracy and
with high convergence speed.
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