Because during the net work learning, BP fall into local minimum, this article proposed a prove algorithm that change the learning gradient, and adjust the weight and threshold, in order to speed up the network's learning speed. At last, this method was used to, study sample at the fuzzy reasoning layer by BP calculation method, obtain professional experience and ways of thinking about bridage safety assessment via the network. Finally, compare the assessment results from the network with those from professionals. The comparison proves the artificial BP-neural network's more feasibility and efficiency.
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