code: def _get_metric_classes(
      self, metric_names: Union[str, List[str]]
  ) -> List[Tuple[str, Callable]]:
      return [
          (metric_name, self._allowed_metrics[metric_name])
          for metric_name in metric_names
      ]
  
imports: from abc import ABC, abstractmethod
  from typing import TYPE_CHECKING, Any, Callable, Dict, Hashable, List, Tuple, Union
  import pandas
  from argilla.client.feedback.schemas.remote.shared import RemoteSchema
  from argilla.pydantic_v1 import BaseModel
label_desc: Use image node_id 5 for calling the MetricBase obj's underlying member method code with example usage: obj._get_metric_classes(metric_names) and returns: unknown