import torch

a = torch.arange(10)
b = torch.arange(10)*10
print( a, b )

a+b

a.shape

a[None].shape

a[:,None].shape

c = a[:,None]
c.shape

c[:,0]

d = a[None]
d.shape

d[0]

d[0,:]

torch.ones([3,2]) + 10

torch.ones([3,2]) + torch.ones([2,3])

torch.ones([3,1]) + torch.ones([1,3])

a[None,:] + b[:,None]

a[None,:].repeat(10,1)

b[:,None].repeat(1,10)

a[None,:].repeat(10,1) + b[:,None].repeat(1,10)

a[None,:] * b[:,None]