code: def input(self):
      return self._input
  
file_path: mars/mars/dataframe/base/rebalance.py
imports: from ...None import opcodes
  from ...serialization.serializables import KeyField, Float64Field, Int64Field
  from ...tensor.base.rebalance import RebalanceMixin
  from ..core import INDEX_TYPE
  from ..initializer import DataFrame, Series, Index
  from ..operands import DataFrameOperand, DataFrameOperandMixin
  from ..utils import validate_axis
label_desc: Use image node_id 2 for calling the DataFrameRebalance obj's underlying member method code with example usage: obj.input() and returns: self