class_docstr: Data Reader for Open Graph Benchmark datasets.
code: def __iter__(self):
      return self
  
file_path: jraph/jraph/ogb_examples/data_utils.py
imports: import pathlib
  import jraph
  import numpy
  import pandas
label_desc: Use image node_id 4 for calling the DataReader obj's underlying member method code with example usage: obj.__iter__() and returns: self