Copy tensor failed

I try to use t.clone(),but got the error as following:
AttributeError: ‘tuple’ object has no attribute 'clone’
I have print the tensor, it likes this:
(Variable containing:
( 0 ,.,.) =
3.6771e-02 9.1163e-03 -4.6124e-03 … 1.6192e-02 -6.2507e-02 -2.6645e-02
3.3874e-02 2.7712e-02 -1.0089e-03 … 1.8731e-02 -6.7204e-02 -1.4607e-02
2.6752e-02 4.6108e-03 -1.4462e-02 … 1.6751e-02 -6.2923e-02 -9.3205e-03
… ⋱ …
8.6184e-03 2.3956e-02 -3.5039e-03 … 2.5552e-02 -8.0435e-02 -2.1839e-02
2.8574e-02 1.8138e-02 1.3028e-02 … 3.8464e-02 -7.3556e-02 -2.0020e-02
2.5375e-02 3.1769e-02 -9.0993e-03 … 2.5984e-02 -5.6886e-02 -2.8673e-02

( 1 ,.,.) =
-4.1037e-02 -1.1623e-02 -6.6585e-02 … -7.7161e-02 -2.5075e-02 3.5004e-02
-4.5208e-02 8.2192e-03 -5.2468e-02 … -5.2976e-02 -4.1708e-02 3.3064e-02
-3.8489e-02 -6.5531e-03 -5.6036e-02 … -6.2628e-02 -6.6918e-02 2.4578e-02
… ⋱ …
-3.6897e-02 -3.0198e-02 -7.0606e-02 … -7.0507e-02 -4.9378e-02 2.4891e-02
-4.0861e-02 -1.9936e-02 -7.6990e-02 … -7.7515e-02 -3.4677e-02 2.3064e-02
-2.2280e-02 2.1252e-03 -5.5134e-02 … -1.0321e-01 -3.5902e-02 4.4363e-04
[torch.cuda.FloatTensor of size 2x32x256 (GPU 0)]
, Variable containing:
( 0 ,.,.) =
8.1449e-02 1.9492e-02 -9.0664e-03 … 3.2678e-02 -1.3380e-01 -5.0523e-02
7.4143e-02 5.8971e-02 -1.9690e-03 … 3.7655e-02 -1.4540e-01 -2.8084e-02
5.9795e-02 9.7720e-03 -2.7975e-02 … 3.4647e-02 -1.3675e-01 -1.7499e-02
… ⋱ …
1.9183e-02 5.1225e-02 -6.8582e-03 … 5.1483e-02 -1.7551e-01 -4.1264e-02
6.2458e-02 3.8586e-02 2.5294e-02 … 7.6771e-02 -1.5727e-01 -3.8019e-02
5.6382e-02 6.6959e-02 -1.7662e-02 … 5.2514e-02 -1.2264e-01 -5.4399e-02

( 1 ,.,.) =
-8.5505e-02 -2.1032e-02 -1.2568e-01 … -1.5592e-01 -4.5696e-02 6.4638e-02
-9.8223e-02 1.4949e-02 -1.0036e-01 … -1.0515e-01 -7.6799e-02 6.1776e-02
-8.3184e-02 -1.1824e-02 -1.0363e-01 … -1.2173e-01 -1.2290e-01 4.6648e-02
… ⋱ …
-7.8155e-02 -5.4790e-02 -1.3294e-01 … -1.4039e-01 -8.9279e-02 4.7344e-02
-8.7492e-02 -3.6960e-02 -1.4446e-01 … -1.5424e-01 -6.5307e-02 4.4151e-02
-4.9116e-02 3.9087e-03 -1.0445e-01 … -2.0894e-01 -6.4353e-02 8.1201e-04
[torch.cuda.FloatTensor of size 2x32x256 (GPU 0)]
)

I see,I use (i.clone() for i in t), it works

Your t is a tuple of one element. Notice the ( and ) surrounding the print.