code: def make_test_loader(manifest_file, manifest_root, backend_obj):
      aeon_config = common_config(
          manifest_file, manifest_root, backend_obj.bsz
      )
      aeon_config["type"] = "audio"  # No labels provided
      aeon_config.pop("label", None)
      dl = AeonDataLoader(aeon_config)
      dl = TypeCast(dl, index=0, dtype=np.float32)
      return dl
  
file_path: neon/examples/whale_calls/data.py
imports: import os
  import numpy
  from zipfile import ZipFile
  from glob import glob
  from neon.util.persist import get_data_cache_or_nothing
  from neon.data.aeon_shim import AeonDataLoader
  from neon.data.dataloader_transformers import OneHot, TypeCast
label_desc: Use image node_id 6 for calling a global function with example usage: make_test_loader(manifest_file, manifest_root, backend_obj) and returns: dl