Pytorch-张量相加的四种方法 / .item()用法

x = torch.rand(5, 3)
y = torch.rand(5, 3)
#第一种
print(x + y)
#第二种
print(torch.add(x, y))
#第三种
result = torch.empty(5, 3)
torch.add(x, y, out=result)
print(result)
#第四种
y.add_(x)
print(y)

x = torch.randn(1)
print(x)
print(x.item())

#结果是
tensor([-0.4464])
-0.44643348455429077

x = torch.randn(2, 2)
print(x[1, 1])
print(x[1, 1].item())

#结果
tensor(0.4279)
0.4278833866119385
···