code: def _infer_df_func_returns(self, in_groupby, dtypes, index):
      index_value, output_types, new_dtypes = None, None, None
  
      output_types = (
          [OutputType.dataframe]
          if in_groupby.op.output_types[0]
          == OutputType.dataframe_groupby
          else [OutputType.series]
      )
  
      try:
          mock_groupby = in_groupby.op.build_mock_groupby()
          with np.errstate(all="ignore"), quiet_stdio():
              if self.call_agg:
                  infer_df = mock_groupby.agg(
                      self.func, *self.args, **self.kwds
                  )
              else:
                  infer_df = mock_groupby.transform(
                      self.func, *self.args, **self.kwds
                  )
  
          # todo return proper index when sort=True is implemented
          index_value = parse_index(None, in_groupby.key, self.func)
  
          if isinstance(infer_df, pd.DataFrame):
              output_types = [OutputType.dataframe]
              new_dtypes = new_dtypes or infer_df.dtypes
          else:
              output_types = [OutputType.series]
              new_dtypes = new_dtypes or (infer_df.name, infer_df.dtype)
      except:  # noqa: E722  # nosec
          pass
  
      self.output_types = (
          output_types if not self.output_types else self.output_types
      )
      dtypes = new_dtypes if dtypes is None else dtypes
      index_value = index_value if index is None else parse_index(index)
      return dtypes, index_value
  
imports: import numpy
  import pandas
  from ...None import opcodes
  from ...core import OutputType
  from ...core.custom_log import redirect_custom_log
  from ...serialization.serializables import BoolField, TupleField, DictField, AnyField
  from ...utils import enter_current_session, quiet_stdio
  from ..operands import DataFrameOperandMixin, DataFrameOperand
  from ..utils import build_empty_df, build_empty_series, parse_index
label_desc: Use image node_id 6 for calling the GroupByTransform obj's underlying member method code with example usage: obj._infer_df_func_returns(in_groupby, dtypes, index) and returns: dtypes,  index_value