def get_gt_infos(self):
        """ gt dir: (wider_face_val.mat, wider_easy_val.mat, wider_medium_val.mat, wider_hard_val.mat)"""

        val_mat = loadmat(self.val_mat)
        hard_mat = loadmat(self.hard_mat_path)
        medium_mat = loadmat(self.medium_mat_path)
        easy_mat = loadmat(self.easy_mat_path)

        box_list = val_mat['face_bbx_list']
        file_list = val_mat['file_list']
        event_list = val_mat['event_list']

        hard_info_list = hard_mat['gt_list']
        medium_info_list = medium_mat['gt_list']
        easy_info_list = easy_mat['gt_list']

        return box_list, file_list, event_list, hard_info_list, medium_info_list, easy_info_list
 gt dir: (wider_face_val.mat, wider_easy_val.mat, wider_medium_val.mat, wider_hard_val.mat)
ppdet/data/source/widerface.py