class_docstr: Adapted from https://docs.dgl.ai/en/latest/_modules/dgl/data/chem/csv_dataset.html#CSVDataset
class_docstr_tok: ["Adapted","from","https",":","\/\/docs.dgl.ai\/en\/latest\/_modules\/dgl\/data\/chem\/csv_dataset.html","#","CSVDataset"]
docstr: Length of the dataset
  Returns
  -------
  int
      Length of Dataset
docstr_tok: ["Length","of","the","dataset","Returns","--","--","--","-","int","Length","of","Dataset"]
code: def __len__(self):
      """Length of the dataset
      Returns
      -------
      int
          Length of Dataset
      """
      return len(self.graphs)
  
file_path: ogb/ogb/graphproppred/dataset_dgl.py
imports: import pandas
  import shutil, os
  import os.path
  import torch
  import numpy
  from dgl.data.utils import load_graphs, save_graphs, Subset
  import dgl
  from ogb.utils.url import decide_download, download_url, extract_zip
  from ogb.io.read_graph_dgl import read_graph_dgl
label_desc: Use image node_id 5 for calling the DglGraphPropPredDataset obj's underlying member method code with example usage: obj.__len__() and returns: len