code: def tile(cls, op):
      if op.method == "tree":
          return (yield from super().tile(op))
      else:
          raise NotImplementedError(
              f"Method {op.method} hasn't been supported"
          )
  
file_path: mars/mars/dataframe/reduction/unique.py
imports: import pandas
  import numpy
  from ...None import opcodes
  from ...core import OutputType, ENTITY_TYPE
  from ...tensor.core import TensorOrder
  from ...utils import lazy_import
  from ..initializer import Series
  from .core import DataFrameReductionOperand, DataFrameReductionMixin, CustomReduction
label_desc: Use image node_id 2 for calling the DataFrameUnique obj's underlying member method code with example usage: obj.tile(cls, op) and returns: unknown