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. Author manuscript; available in PMC: 2019 Sep 1.
Published in final edited form as: IEEE J Biomed Health Inform. 2017 Oct 27;22(5):1589–1604. doi: 10.1109/JBHI.2017.2767063

Fig. 5.

Fig. 5

Symbolic representation of a RNN (left) with equivalent expanded representation (right) for an example input sequence of length three, three hidden units, and a single output. Each input time step is combined with the current hidden state of the RNN, which itself depends on the previous hidden state, demonstrating the memory effect of RNNs.