code: def wrap_dataloader(dl):
      dl = OneHot(dl, index=1, nclasses=2)
      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 2 for calling a global function with example usage: wrap_dataloader(dl) and returns: dl