docstr: Number of data examples
  Return
  -------
  int
docstr_tok: ["Number","of","data","examples","Return","--","--","--","-","int"]
code: def __len__(self):
      r"""Number of data examples
      Return
      -------
      int
      """
      return len(self.graph)
  
file_path: dgl/examples/pytorch/gas/dataloader.py
imports: import os
  import dgl
  import numpy
  import scipy.io
  import torch
  from dgl.data import DGLBuiltinDataset
  from dgl.data.utils import _get_dgl_url, load_graphs, save_graphs
label_desc: Use image node_id 9 for calling the GASDataset obj's underlying member method code with example usage: obj.__len__() and returns: len