mean_all_array Module Function

  module function mean_all_array(a) result(c)
    !! Compute mean value of all elements in an autodiff array
    implicit none
    class(array_type), intent(in), target :: a
    type(array_type), pointer :: c

    integer :: i, s, n_rows, n_cols
    real(real32) :: rtmp1, inv_count

    n_rows = size(a%val, 1)
    n_cols = size(a%val, 2)

    c => a%create_result(array_shape = [1, 1])
    rtmp1 = real(n_rows * n_cols, real32)
    inv_count = 1.0_real32 / rtmp1

    c%val(1,1) = sum(a%val) * inv_count

    c%indices = [1, 1]

    c%get_partial_left => get_partial_mean_all
    c%get_partial_left_val => get_partial_mean_all_val
    if(a%requires_grad)then
       c%requires_grad = .true.
       c%is_forward = a%is_forward
       c%operation = 'mean_all_array'
       c%left_operand => a
       c%owns_left_operand = a%is_temporary
    end if

  end function mean_all_array