ValueError: only one element tensors can be converted to Python scalars
問題原因：
a,b=torch.tensor([1,2,3]),torch.tensor([1,2,3])
lis.append(a)
lis.append(b)
torch.tensor(lis)
不能把一個元素為tensor的list用torch.tensor進行封裝
解決
把tensor轉為list
a,b=torch.tensor([1,2,3]),torch.tensor([1,2,3])
lis.append(a.tolist())
lis.append(b.tolist())
torch.tensor(lis)
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