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The implementations of RNN models are determined by the label structure of each signal sample. (a) shows a signal sequence with a sequential label. The general applied RNN could be designed in (c). Sometimes a signal sequence could only have one annotated label, as shown in (b), and the RNN could be designed in the form of (d). Although (c) and (d) show one-layer unidirectional RNN, multiple stacked layers or bidirectional RNN are also adoptable.
