code: def forward(self, x):
      identity = x
      y = self.conv3(self.conv2(self.conv1(x)))
      return y + identity
  
file_path: PaddleDetection/ppdet/modeling/necks/dilated_encoder.py
imports: import paddle
  import paddle.nn
  from paddle import ParamAttr
  from paddle.regularizer import L2Decay
  from paddle.nn.initializer import KaimingUniform, Constant, Normal
  from ppdet.core.workspace import register, serializable
  from ..shape_spec import ShapeSpec
label_desc: Use image node_id 2 for calling the Bottleneck obj's underlying member method code with example usage: obj.forward(x) and returns: unknown