sr_img = utils.tensor2np(pre.detach()[0])
gt_img = utils.tensor2np(hr_tensor.detach()[0])
File "/home/tt/train.py", line 197, in <module>
valid()
File "/home/tt/train.py", line 162, in valid
sr_img = utils.tensor2np(pre.detach()[0])
AttributeError: 'list' object has no attribute 'detach'