Hourglass network has problem

[wdkwyf]

1. hourglass module should have symmetric structure which means it has three residual modules in at the most inner layer.

    if n > 1:
        lower2 = _hourglass(lower1, n-1)
    else:
        lower2 = lower1

I think lower2 should also be add to residual module:

    if n > 1:
        lower2 = _hourglass(lower1, n-1)
    else:
        lower2 = lower1
        lower2 = _residual(lower2)

2. In the residual module, why half_num_in instead of half_num_out