code: def assert_packed_frame_picklable(df):
      serialbytes = pickle.dumps(pack(df))
      loaded = unpack(pickle.loads(serialbytes))
      assert_eq(loaded, df)
  
imports: import pickle
  import sys
  import numpy
  import pandas
  from cudf import DataFrame, GenericIndex, Series
  from cudf._lib.copying import pack, unpack
  from cudf.testing._utils import assert_eq
label_desc: Use image node_id 15 for calling a global function with example usage: assert_packed_frame_picklable(df) without return types