Solved by rahulvigneswaran in post #2 
              
              
                I guess the [self.idx[index]] would be the correct way to go. 
The logic being that if you use the self.data_info[0][index] directly, then the skip_every_n_image would become useless. But when you use self.data_info[0][self.idx[index]], you are making use of the self.idx which has the data after ski…