code: def _input(self):
      self.image = fluid.layers.data(
          name="image", shape=self.data_shape, dtype="float32"
      )
      if not self.is_infer:
          self.face_box = fluid.layers.data(
              name="face_box", shape=[4], dtype="float32", lod_level=1
          )
          self.head_box = fluid.layers.data(
              name="head_box", shape=[4], dtype="float32", lod_level=1
          )
          self.gt_label = fluid.layers.data(
              name="gt_label", shape=[1], dtype="int32", lod_level=1
          )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  import six
  import paddle.fluid
  from paddle.fluid.param_attr import ParamAttr
  from paddle.fluid.initializer import Xavier
  from paddle.fluid.initializer import Constant
  from paddle.fluid.initializer import Bilinear
  from paddle.fluid.regularizer import L2Decay
label_desc: Use image node_id 3 for calling the PyramidBox obj's underlying member method code with example usage: obj._input() without return types