code: def forward(self, x):
      down = self.relu1(self.bn1(self.down_conv(x)))
      out = self.dropout(down) if self.if_dropout else down
      out = self.ops(out)
      out = paddle.add(out, down)
      out = self.relu2(out)
  
      return out
  
imports: import os
  import sys
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from medicalseg.cvlibs import manager
  from medicalseg.utils import utils
label_desc: Use image node_id 2 for calling the DownTransition obj's underlying member method code with example usage: obj.forward(x) and returns: out