code: def assert_packed_frame_equality(df):
      pdf = df.to_pandas()
  
      packed = pack(df)
      del df
      unpacked = unpack(packed)
  
      assert_eq(unpacked, pdf)
  
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 3 for calling a global function with example usage: assert_packed_frame_equality(df) without return types