Table 4. ASO variants for feature selection.

Authors	ASO variant	Year
Too & Abdullah (2020b)	Chaotic ASO	2020
Too & Abdullah (2020a)	Binary ASO	2020
Borhade & Nagmode (2020)	Hybrid ASO	2020
Wu, Ren & Hao (2021)	Binary ASO	2021
Halhalli, Sugave & Jagdale (2021)	Hybrid ASO	2021
Menaga & Revathi (2021)	Fractional-ASO	2021
Sun et al. (2021b)	Multi-strategy ASO	2021
Shyjith, Maheswaran & Reshma (2021)	Hybrid ASO	2021
Hammadi & Qasim (2022)	Binary ASO	2022
Dabbu et al. (2022)	Hybrid ASO	2022
Ghimire et al. (2022)	Standard ASO	2022
Duan et al. (2022b)	Standard ASO	2022
Mahapatra, Singh & Kumar (2022)	Quantum ASO	2022
Alhassan & Zainon (2022)	Hybrid ASO	2022
Deore & Bhosale (2023)	Hybrid ASO	2023
Navin et al. (2023)	Hybrid ASO	2023
Musthafa et al. (2023)	Chaotic ASO	2023
Lu et al. (2023)	Hybrid ASO	2023
Borhade et al. (2023)	Hybrid ASO	2023
Chattopadhyay et al. (2023)	Hybrid ASO	2023
Anitha & Aravindhar (2024)	Levy flight-based ASO	2024
Singh & Kumar (2024)	Hybrid ASO	2024
Maazalahi & Hosseini (2024)	Hybrid ASO	2024
Pitchandi, Nivaashini & Grace (2024)	Hybrid ASO	2024
Ali et al. (2024)	Standard ASO	2024