“…In recent years, as computing resources and tools are becoming continuously easier and more affordable to reach [100], researchers across the globe have started to show continuously increasing interest in exploring applications of machine learning techniques [101] for the purpose of forecasting commodity prices. Corresponding studies in the literature have covered many different commodities from different economic sectors and industries, including but not limited to those in the agricultural sector, such as soybeans [102–108], soybean oil [109–111], palm oil [112], sugar [113–118], corn [102, 113, 119–131], wheat [105, 132–139], coffee [140–146], oats [147], cotton [132, 148], canola [149–151], peanut oil [152–158], green beans [159, 160], and edible oil [112, 153, 161–164], those in the energy sector, such as electricity [165–169], carbon emission allowances [170–174], coal [175–179], crude oil [180–184], heating oil [185–189], and natural gas [190–194], and those in the metal sector, such as lead [195], copper [196], palladium [197–201], platinum […”