I trained the model with 2 Tesla V100 GPUs in the default configuration and got Easy@R40, Moderate@R40, Hard@R40 21.203, 15.1487,12.7407 respectively， which is lower than the 23.77,16.07, 13.61 you declared. But when I use the pre-trained weight, I can get 23.77,16.07, 13.61. So, are there any training tricks that have not been published?