get_partial_add_bias Function

  function get_partial_add_bias(this, upstream_grad) result(output)
    !! Get partial derivative with respect to bias operand
    implicit none
    class(array_type), intent(inout) :: this
    type(array_type), intent(in) :: upstream_grad
    type(array_type) :: output

    call output%allocate(array_shape = [ this%right_operand%shape, 1 ])
    call this%get_partial_right_val(upstream_grad%val, output%val)

  end function get_partial_add_bias