docstr: Get requested data properties.
  
  Please check :ref:`User Guide <metadata_routing>` on how the routing
  mechanism works.
  
  .. versionadded:: 1.3
  
  Returns
  -------
  routing : MetadataRouter
      A :class:`~utils.metadata_routing.MetadataRouter` encapsulating
      routing information.
code: def get_metadata_routing(self):
      """Get requested data properties.
  
      Please check :ref:`User Guide <metadata_routing>` on how the routing
      mechanism works.
  
      .. versionadded:: 1.3
  
      Returns
      -------
      routing : MetadataRouter
          A :class:`~utils.metadata_routing.MetadataRouter` encapsulating
          routing information.
      """
      # This scorer doesn't do any validation or routing, it only exposes the
      # requests of the given estimator. This object behaves as a consumer
      # rather than a router. Ideally it only exposes the score requests to
      # the parent object; however, that requires computing the routing for
      # meta-estimators, which would be more time consuming than simply
      # returning the child object's requests.
      return get_routing_for_object(self._estimator)
  
imports: import copy
  import warnings
  from collections import Counter
  from functools import partial
  from inspect import signature
  from traceback import format_exc
  from ..base import is_regressor
  from ..utils import Bunch
  from ..utils._param_validation import HasMethods, Hidden, StrOptions, validate_params
  from ..utils._response import _get_response_values
  from ..utils.metadata_routing import MetadataRequest, MetadataRouter, _MetadataRequester, _raise_for_params, _routing_enabled, get_routing_for_object, process_routing
  from ..utils.validation import _check_response_method
  from .None import accuracy_score, average_precision_score, balanced_accuracy_score, brier_score_loss, class_likelihood_ratios, explained_variance_score, f1_score, jaccard_score, log_loss, matthews_corrcoef, max_error, mean_absolute_error, mean_absolute_percentage_error, mean_gamma_deviance, mean_poisson_deviance, mean_squared_error, mean_squared_log_error, median_absolute_error, precision_score, r2_score, recall_score, roc_auc_score, root_mean_squared_error, root_mean_squared_log_error, top_k_accuracy_score
  from .cluster import adjusted_mutual_info_score, adjusted_rand_score, completeness_score, fowlkes_mallows_score, homogeneity_score, mutual_info_score, normalized_mutual_info_score, rand_score, v_measure_score
label_desc: Use image node_id 3 for calling the _PassthroughScorer obj's underlying member method code with example usage: obj.get_metadata_routing() and returns: get_routing_for_object