class_docstr: Compressed size of first 10^9 bytes of enwiki-20060303-pages-articles.xml.
  It's part of Large Text Compression Benchmark project
code: def __getitem__(self, i):
      return self._data[i]
  
file_path: pytext/pytext/legacy/datasets/unsupervised_learning.py
imports: import os
  import torch
  from torchtext.data.functional import custom_replace, simple_space_split
  from torchtext.utils import download_from_url, extract_archive
  from ..vocab import build_vocab_from_iterator
label_desc: Use image node_id 2 for calling the EnWik9 obj's underlying member method code with example usage: obj.__getitem__(i) and returns: self