code: def test_read_ahead():
      general_corner_case(read_ahead=True)
  
file_path: DALI/dali/test/python/reader/test_webdataset_corner.py
imports: import math
  import nvidia.dali
  import os
  import tempfile
  from glob import glob
  from nose.tools import assert_equal
  import webdataset_base
  from nose_utils import assert_raises
  from test_utils import compare_pipelines, get_dali_extra_path
label_desc: Use image node_id 4 for calling a global function with example usage: test_read_ahead() without return types