code: def _reduce(self) -> Callable[[Sequence[TensorType]], TensorType]:
      pass
  
imports: import abc
  from functools import partial, reduce
  from typing import Callable, List, Optional, Sequence, Tuple, Union, overload
  import numpy
  import tensorflow
  from check_shapes import check_shapes
  from ..base import AnyNDArray, Module, TensorType
label_desc: Use image node_id 4 for calling the ReducingCombination obj's underlying member method code with example usage: obj._reduce() without return types