class_docstr: Create index file for dataloader.
code: def __init__(self, path, index_file, pattern="*"):
      self.path = path
      self.index_file = index_file
      self.pattern = pattern
  
file_path: neon/neon/data/indexer.py
imports: from builtins import str, zip
  import os
  import glob
  import logging
  from neon import NervanaObject
label_desc: Use image node_id 1 to create a new Indexer object from inherited base classes: NervanaObject with example: obj = Indexer(path, index_file, pattern)