Actually I guess I mistook torch with Pytorch and though this is available here as well (as cudnn.benchmark is!) . This was the case for torch back in the day if I’m not mistaken.
Since Pytorch released I have only used cudnn.benchmark myself and never used the cudnn.fastest as I remember benchmark handled everything by itself . I have never seen cudnn.fastes in any official examples and chances are those repos that do use cudnn.fastes, do it as a habit comming from torch!