求多个torch tensor的平均值

我有一串torch tensor，shape都是一样的，假设都是5x3的，我怎么对它们求均值呢？就是各个位置的均值，最后得到的还是一个5x3的torch tensor。

假设我有四个tensor，t1, t2, t3, t4。我进行下面的操作

torch.mean([t1, t2, t3, t4], 0)

结果报错

TypeError: mean() received an invalid combination of arguments - got (list, int), but expected one of:
 * (Tensor input)
 * (Tensor input, torch.dtype dtype)
      didn't match because some of the arguments have invalid types: (list, int)
 * (Tensor input, int dim, torch.dtype dtype, Tensor out)
 * (Tensor input, int dim, bool keepdim, torch.dtype dtype, Tensor out)
 * (Tensor input, int dim, bool keepdim, Tensor out)