code: def _execute(cls, ctx, op: "PairwiseDistancesTopk"):
      (x, y), device_id, xp = as_same_device(
          [ctx[inp.key] for inp in op.inputs],
          device=op.device,
          ret_extra=True,
      )
  
      with device(device_id):
          xp = get_array_module(x, nosparse=True)
          dist, ind = cls._calcuate_topk_distances(x, y, op, xp)
          dist, ind_on_ind = cls._topk_reduce_func(
              dist, 0, op.k, xp, op.metric
          )
          ctx[op.outputs[0].key] = dist
          if op.return_index:
              ind_result = xp.empty_like(ind_on_ind)
              for i in range(
                  len(ind_on_ind)
              ):  # pylint: disable=consider-using-enumerate
                  ind_result[i] = ind[i][ind_on_ind[i]]
              ctx[op.outputs[1].key] = ind_result
  
imports: from functools import partial
  import numpy
  from ....None import opcodes
  from ....None import options
  from ....core import recursive_tile
  from ....core.operand import OperandStage
  from ....serialization.serializables import KeyField, BoolField, DictField, Int64Field, AnyField
  from ....tensor.core import TensorOrder
  from ....tensor.merge import TensorConcatenate
  from ....tensor.array_utils import as_same_device, device, get_array_module
  from ....utils import has_unknown_shape, ensure_own_data
  from ...utils import gen_batches, get_chunk_n_rows
  from ...utils.validation import _num_samples
  from .core import PairwiseDistances
label_desc: Use image node_id 19 for calling the PairwiseDistancesTopk obj's underlying member method code with example usage: obj._execute(cls, ctx, op) without return types