import torch
anch_ious = torch.Tensor([[1, 2, 3,4], [7,8,9,3]])
# anch_ious = torch.Tensor([[1, 2, 3,4], [4, 5, 6,7]]).view(-1)
neg_count=3
top_data,index= torch.topk(anch_ious, neg_count, dim=1, largest=True, sorted=True, out=None)
# print(anch_ious[index])
index_num = torch.arange(0, anch_ious.size(0)).repeat(3,1)
index_num=torch.flatten(index_num.t())
print(index_num)
# indexs = index[:, 1:]
index = torch.flatten(index)
print(anch_ious[index_num,index])