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Social Sciences, Economics, Management, Business & Economics, M5 Accuracy competition, Computational requirements, Transfer learning, LightGBM, Hierarchical forecasting, long short-term memory models (Hochreiter &, Schmid, NEURAL-NETWORKS, COMPETITION, ACCURACY, 0104 Statistics, 1403 Econometrics, 1505 Marketing, Econometrics, 3802 Econometrics, 4905 Statistics