ECHANT: An efficient context hierarchical attention network for named entity recognition. - Abdalrahman Hussein; Aryender Singh; Meerja Akhil Jabbar; Chetansinh R. Vaghela; Narmadha Thangarasu; Manoranjan Parhi; J. Albert Mayan; Pradeep Kumar Mishra; Vikas Wasson (Int. J. Data Sci. Anal., 2026)