code: def forward(self, x):
      x = self.fc1(x)
      x = self.norm1(x)
      x = self.act(x)
  
      if self.mid_conv:
          x_mid = self.mid(x)
          x = self.act(x_mid)
      x = self.drop(x)
  
      x = self.fc2(x)
      x = self.norm2(x)
  
      x = self.drop(x)
      return x
  
imports: import math
  import itertools
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddleseg.utils import utils
  from paddleseg.cvlibs import manager, param_init
  from paddleseg.models.backbones.transformer_utils import *
label_desc: Use image node_id 2 for calling the Mlp obj's underlying member method code with example usage: obj.forward(x) and returns: x