code: def groupby_params(self):
      params = self.inputs[0].op.groupby_params
      params["selection"] = self.selection
      return params
  
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 3 for calling the GroupByIndex obj's underlying member method code with example usage: obj.groupby_params() and returns: params