def _upsample(x):
    (h, w) = x.shape[2:]
    return F.unpooling_2d(x, 2, outsize=((h * 2), (w * 2)))
def _upsample(x):
    (h, w) = x.shape[2:]
    return F.unpooling_2d(x, 2, outsize=((h * 2), (w * 2)))