“…A wide array of research works uncovers the discriminatory information that best expresses pneumonia from normal samples on chest X-rays. The methods employed in the research of pneumonia/COVID-19 classification from chest X-rays fall into these categories: Machine learning (ML) methods [11] , [12] , [13] , statistical approaches [14] , CNN architectures [15] , [16] , [17] , [18] , [19] , [20] , [21] , [22] , transfer learning [23] , [24] , [25] , [26] , [27] , [28] , [29] , [30] , [31] , [32] , [33] , [34] , complex CNN models [35] , [36] , [37] , [38] , [39] , [40] , [41] , [42] and adversarial networks [43] .…”