说明：  滚动轴承多部位多类别故障诊断属于大规模或者较复杂分类问题，利用智能方法诊断时需 要设计结构合理的神经网络才能实现高精度诊断
(Rolling multi-site multi-class fault diagnosis are more complex or large-scale classification problems, the need for the rational design of neural network structure in order to achieve high-precision diagnostics using intelligent methods of diagnosis)