class_docstr: Class that defines data loader
class_docstr_tok: ["Class","that","defines","data","loader"]
code: def __iter__(self):
      return self
  
file_path: nlp-architect/nlp_architect/data/ptb.py
imports: import os
  import sys
  import numpy
  import urllib.request
label_desc: Use image node_id 2 for calling the PTBDataLoader obj's underlying member method code with example usage: obj.__iter__() and returns: self