code: def _calc_out_dtypes(self, in_groupby):
      mock_groupby = in_groupby.op.build_mock_groupby()
      func_name = getattr(self, "_func_name")
  
      if func_name == "cumcount":
          result_df = mock_groupby.cumcount(ascending=self.ascending)
      else:
          result_df = getattr(mock_groupby, func_name)(axis=self.axis)
  
      if isinstance(result_df, pd.DataFrame):
          self.output_types = [OutputType.dataframe]
          return result_df.dtypes
      else:
          self.output_types = [OutputType.series]
          return result_df.name, result_df.dtype
  
imports: import numpy
  import pandas
  from ...None import opcodes
  from ...core import OutputType
  from ...serialization.serializables import BoolField, AnyField
  from ...utils import lazy_import
  from ..utils import parse_index, build_empty_df, build_empty_series, validate_axis
  from ..operands import DataFrameOperandMixin, DataFrameOperand
label_desc: Use image node_id 4 for calling the GroupByCumReductionOperand obj's underlying member method code with example usage: obj._calc_out_dtypes(in_groupby) and returns: result_df, result_df,  result_df