关于 pytorch TVloss 代码实现的一些疑惑

[Waihinchan]

网上看到普遍的答案是这个

class TVLoss(nn.Module):
    def __init__(self,TVLoss_weight=1):
        super(TVLoss,self).__init__()
        self.TVLoss_weight = TVLoss_weight

    def forward(self,x):
        batch_size = x.size()[0]
        h_x = x.size()[2]
        w_x = x.size()[3]
        count_h = self._tensor_size(x[:,:,1:,:])
        count_w = self._tensor_size(x[:,:,:,1:])
        h_tv = torch.pow((x[:,:,1:,:]-x[:,:,:h_x-1,:]),2).sum()
        w_tv = torch.pow((x[:,:,:,1:]-x[:,:,:,:w_x-1]),2).sum()
        return self.TVLoss_weight*2*(h_tv/count_h+w_tv/count_w)/batch_size

    def _tensor_size(self,t):
        return t.size()[1]*t.size()[2]*t.size()[3]

这里给出的说的是β=2,且不支持变更. 所以按照这里给出的公式 https://blog.csdn.net/yexiaogu1104/article/details/88395475 β/2, 当β=2 那就是 1 也就是不进行任何操作. 所以最后 return 这里为什么会返回一个 self.TVLoss_weight2, 为啥要2 呢..