code: def forward(self, roi_feat, stage=0):
      y = self.res5(roi_feat)
      return y
  
imports: from numbers import Integral
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from ppdet.core.workspace import register, serializable
  from ..shape_spec import ShapeSpec
  from .resnet import ConvNormLayer
label_desc: Use image node_id 3 for calling the Res2NetC5 obj's underlying member method code with example usage: obj.forward(roi_feat, stage) and returns: y