code: def load_gz(data_source, chunk_size=None, verbose=False):
      """Gz data loader. Reads compressed file."""
      raise NotImplementedError
  
file_path: AmpliGraph/ampligraph/datasets/source_identifier.py
imports: import logging
  from collections.abc import Iterable
  from itertools import chain, islice
  import numpy
  import pandas
label_desc: Use image node_id 4 for calling a global function with example usage: load_gz(data_source, chunk_size, verbose) without return types