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
  
file_path: PGL/legacy/examples/SAGPool/dataloader.py
imports: import numpy
  import collections
  import paddle
  import pgl
  from pgl.utils.logger import log
  from pgl.graph import Graph, MultiGraph
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