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import torch
t1 = torch.tensor(4.)
t1
t1.dtype
torch.float32
t2 = torch.tensor([1.,2.,3.,4.])
t2
tensor([1., 2., 3., 4.])
t4 = torch.tensor([
    [[11, 12, 13], 
     [13, 14, 15]], 
    [[15, 16, 17], 
     [17, 18, 19.]]])
t4.shape
torch.Size([2, 2, 3])
x = torch.tensor(3.)
w = torch.tensor(4., requires_grad = True)
b = torch.tensor(5., requires_grad = True)