1. Consider the Long Short-Term Memory unit depicted^(*) below:

   

   The three numbered sigmoid (σ) nodes are special gates that regulate the unit. Associate each gate with its name:

   • forget gate
   • input gate
   • output gate

A.:

(1) input gate; (2) forget gate; (3) output gate.

(*) Image modified from "Short-Term Load Forecasting Using EMD-LSTM Neural Networks with a Xgboost Algorithm for Feature Importance Evaluation", by Huiting Zheng, Jiabin Yuan, and Long Chen. Energies 2017, 10(8), 1168; https://doi.org/10.3390/en10081168 (used in accordance with Creative Commons Attribution License [CC BY 4.0] which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.)