code: def _get_map_output_types(cls, input_chunk, method: str):
      if method == "subset_tree":
          return [OutputType.dataframe]
      else:
          return input_chunk.op.output_types
  
imports: import numpy
  import pandas
  from ...None import opcodes
  from ...core.operand import OperandStage
  from ...serialization.serializables import BoolField
  from ...utils import lazy_import, calc_nsplits
  from ..operands import OutputType
  from ..utils import parse_index, hash_dataframe_on, gen_unknown_index_value, standardize_range_index
  from ._duplicate import DuplicateOperand, validate_subset
label_desc: Use image node_id 7 for calling the DataFrameDropDuplicates obj's underlying member method code with example usage: obj._get_map_output_types(cls, input_chunk, method) and returns: list, input_chunk