code: def __init__(self, selection=None, output_types=None, **kw):
      super().__init__(
          _selection=selection, _output_types=output_types, **kw
      )
  
file_path: mars/mars/dataframe/groupby/getitem.py
imports: from collections.abc import Iterable
  from ...None import opcodes
  from ...core import OutputType
  from ...serialization.serializables import AnyField
  from ..operands import DataFrameOperandMixin, DataFrameOperand
  from ..utils import parse_index
label_desc: Use image node_id 1 to create a new GroupByIndex object from inherited base classes: DataFrameOperandMixin, DataFrameOperand with example: obj = GroupByIndex(selection, output_types)