code: def forward(self, x):
      if self.use_layer_scale:
          x = x + self.drop_path(
              self.layer_scale_1 * self.token_mixer(x)
          )
          x = x + self.drop_path(self.layer_scale_2 * self.mlp(x))
  
      else:
          x = x + self.drop_path(self.token_mixer(x))
          x = x + self.drop_path(self.mlp(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 AttnFFN obj's underlying member method code with example usage: obj.forward(x) and returns: x