code: def forward(self, x):
      x = self.drop(self.act(self.fc1(x)))
      x = self.drop(self.fc2(x))
      return x
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  import numpy
  import math
  from paddle import ParamAttr
  from paddle.regularizer import L2Decay
  from paddle.nn.initializer import Constant, TruncatedNormal
  from ppdet.modeling.shape_spec import ShapeSpec
  from ppdet.core.workspace import register, serializable
  from .transformer_utils import zeros_, DropPath, Identity, window_partition, window_unpartition
  from ..initializer import linear_init_
label_desc: Use image node_id 3 for calling the Mlp obj's underlying member method code with example usage: obj.forward(x) and returns: x