What dataset is used for the ablation study on cityscapes dataset, the validation set or the testing set?

[liuzhidemaomao]

Is the ablation study carried out on the cityscapes validation set? If so, after multi-scale and flip operations, the result on validation set is the same as on the testing set, both are 82.3 mIoU. Is this a coincidence? By the way, what strategies are adopted for the testing set?