Research on Named Entity Recognition Method of Metro On-Board Equipment Based on Multiheaded Self-Attention Mechanism and CNN-BiLSTM-CRF

Figure 9

The loss function value of different optimizers varies with the number of iteration steps in different epochs: (a) 5th Epoch; (b) 10th Epoch; (c) 15th Epoch; (d) 20th Epoch; (e) 25th Epoch.

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