def __init__(self, in_ch, out_ch):
    super(R2UNet._Down, self).__init__()
    self.down = nn.Sequential(nn.MaxPool2d(kernel_size=2), RRCU(in_ch, out_ch))
def __init__(self, in_ch, out_ch):
    super(R2UNet._Down, self).__init__()
    self.down = nn.Sequential(nn.MaxPool2d(kernel_size=2), RRCU(in_ch, out_ch))