code: def forward(self, x):
      features = self.fc1(x)
      features = self.act_fn(features)
      features = self.fc2(features)
      features = self.dropout(features)
      features = self.layernorm(features + x)
      return features
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddle.nn import ReLU, Swish, GELU
  import math
  from ppdet.core.workspace import register
  from ..shape_spec import ShapeSpec
label_desc: Use image node_id 2 for calling the BertFeedForward obj's underlying member method code with example usage: obj.forward(x) and returns: features