“…The SVIP has been applied to solving many real life problems, such as, modelling intensitymodulated radiation therapy treatment planning [7,8], and modelling of inverse problems arising from phase retrieval [4]. Recently, a lot of projection algorithms were proposed to solve the SVIP (1.1)-(1.2) in infinite-dimensional spaces; see, e.g., [2,5,6,11,12,13,23,25] and the references therein.…”