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Figure 8. Fault diagnosis classification diagram. The fault size is 0.021 inches, the number of samples without working conditions is 48,000, and the fault diagnosis results are shown under multiple working conditions. (A) Shows the fault diagnosis classification diagram of deep neural network; (B) shows the fault diagnosis classification diagram of hierarchical deep neural network; (C) shows the fault diagnosis classification diagram of convolution neural networks with training interference; and (D) shows the fault diagnosis classification diagram of modular federated learning method.