Performs the outer-product between vec1 (1D tensor) and vec2 (1D tensor), multiply the resulting matrix by the scalar value and add the result to self (which must be a 2D tensor). In other words, 

self_ij = self_ij + value * vec1_i * vec2_j

If vec1 is a vector of size n and vec2 is a vector of size m, then self must be a matrix of size n x m. 

> x = torch.Tensor(3)        
> y = torch.Tensor(2)
> for i=1,3 do x[i] = i end
> for i=1,2 do y[i] = i end
> M = torch.Tensor(3, 2):zero()
> M:addT1outT1(1, x, y)
> = M

 1  2
 2  4
 3  6
[torch.Tensor of dimension 3x2]