code: def post(
      self, in_data
  ):  # noqa: W0221  # pylint: disable=arguments-differ
      xdf = cudf if self.is_gpu() else pd
      if isinstance(in_data, xdf.Series):
          return in_data.explode().nunique(dropna=self._dropna)
      else:
          in_data_iter = (
              in_data.iteritems()
              if self._axis == 0
              else in_data.iterrows()
          )
          data = dict()
          for d, v in in_data_iter:
              if isinstance(v.dtype, ArrowListDtype):
                  v = xdf.Series(v.to_numpy())
              data[d] = v.explode().nunique(dropna=self._dropna)
          return xdf.Series(data)
  
imports: import pandas
  from ...None import opcodes
  from ...core import OutputType
  from ...config import options
  from ...serialization.serializables import BoolField
  from ...utils import lazy_import
  from ..arrays import ArrowListArray, ArrowListDtype
  from .core import DataFrameReductionOperand, DataFrameReductionMixin, CustomReduction
label_desc: Use image node_id 5 for calling the NuniqueReduction obj's underlying member method code with example usage: obj.post(in_data) and returns: in_data, xdf