class_docstr: Graph Dataloader
      
class_docstr_tok: ["Graph","Dataloader"]
docstr: scan
docstr_tok: ["scan"]
code: def scan(self):
      """scan"""
      for example in self.dataset:
          yield example
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from __future__ import unicode_literals
  from __future__ import absolute_import
  import os
  import sys
  import time
  import argparse
  import numpy
  import collections
  import paddle
  import paddle.fluid
  import paddle.fluid.layers
  import pgl
  from pgl.utils import mp_reader
  from pgl.utils.logger import log
label_desc: Use image node_id 7 for calling the GraphDataloader obj's underlying member method code with example usage: obj.scan() without return types