Returns the jump necessary to go from one element to the next one in the specified dimension dim. Example: 

> x = torch.Tensor(4,5):zero()
> print(x)

0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
[torch.Tensor of dimension 4x5]

  --- elements in a column are contiguous in memory
> return  x:stride(1)
1

  --- to go from one element to the next one in a row
  --- we need here to jump the size of the column
> return  x:stride(2)
4

Note also that in Torch elements in the same column [elements along the first dimension] are contiguous in memory for a matrix [tensor].