import torch

v = torch.tensor([1, 2, 3, 4])   # shape (4,)

row = v.unsqueeze(0)             # (1, 4) — one row
col = v.unsqueeze(1)             # (4, 1) — one column

print(row.shape, col.shape)
# torch.Size([1, 4]) torch.Size([4, 1])