[Python] Pytorch meshgrid

I'm currently using torch 1.12 for my thesis on neural A star algorithm and i'm not quite sure what meshgrid does. For example why

x = torch.tensor([1, 2, 3])
y = torch.tensor([4, 5, 6])
torch.meshgrid(x, y)


return

tensor([[1, 1, 1], [2, 2, 2], [3, 3, 3]])
tensor([[4, 5, 6], [4, 5, 6], [4, 5, 6]])


and not

tensor([[1, 1, 1], [2, 2, 2], [3, 3, 3]])
tensor([[4, 4, 4], [5, 5, 5], [6, 6, 6]])

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