class_docstr: PglGraphPropPredDataset
code: def __repr__(self):  # pragma: no cover
      return "{}({})".format(self.__class__.__name__, len(self))
  
file_path: PGL/legacy/pgl/contrib/ogb/graphproppred/dataset_pgl.py
imports: import pandas
  import shutil, os
  import os.path
  import numpy
  from ogb.utils.url import decide_download, download_url, extract_zip
  from ogb.graphproppred import make_master_file
  from pgl.contrib.ogb.io.read_graph_pgl import read_csv_graph_pgl
label_desc: Use image node_id 6 for calling the PglGraphPropPredDataset obj's underlying member method code with example usage: obj.__repr__() and returns: str