There are three parameters ((0.5,0.5,0.5),(0.5,0.5,0.5)) and written twice. I recently started python with deep learning so its confusing me. As you mentioned it is defined as mean and std. then it should two mention it as (0.5, 0.5). why we have (0.5,0.5,0.5)? Whats the third 0.5 shows? and secondly why we have these values twice?