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. 2021 Jul 1;8(1):12. doi: 10.1186/s40708-021-00134-4

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© The Author(s) 2021

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Fig. 7 — Diagram illustrating the GRU architecture. The reset and update gate are hidden layers with sigmoid activation function, + and x connections are pair-wise addition and multiplication operators, respectively. At the same time, the $| |$ connections are vector concatenation operators