code: def serialize(self):
      header, frames = super().serialize()
      labels_head, labels_frames = self.bin_labels.serialize()
      header["__bin_labels"] = labels_head
      header["__bin_labels_count"] = len(labels_frames)
      header["_freq"] = self._freq
      frames.extend(labels_frames)
      return header, frames
  
imports: import pickle
  import numpy
  import pandas
  import cudf
  import cudf._lib.labeling
  import cudf.core.index
  from cudf._typing import DataFrameOrSeries
  from cudf.core.groupby.groupby import DataFrameGroupBy, GroupBy, SeriesGroupBy, _Grouping
  from cudf.core.tools.datetimes import _offset_alias_to_code, _unit_dtype_map
label_desc: Use image node_id 4 for calling the _ResampleGrouping obj's underlying member method code with example usage: obj.serialize() and returns: header,  frames