code: def _multiply(self, x1, x2, out):
          
          np.multiply(x1.data, x2.data, out=out.data)
docs: Compute the entry-wise product ``out = x1 * x2``.
  
          This function is part of the subclassing API. Do not
          call it directly.
  
          Parameters
          ----------
          x1, x2 : `NumpyTensor`
              Factors in the product.
          out : `NumpyTensor`
              Element to which the result is written.
  
          Examples
          --------
          >>> space = odl.rn(3)
          >>> x = space.element([1, 0, 3])
          >>> y = space.element([-1, 1, -1])
          >>> space.multiply(x, y)
          rn(3).element([-1.,  0., -3.])
          >>> out = space.element()
          >>> result = space.multiply(x, y, out=out)
          >>> result
          rn(3).element([-1.,  0., -3.])
          >>> result is out
          True