code: def get_metric(metric_name: MetricsEnum) -> MetricCallable:
      return MetricsRepository._metrics_implementations[metric_name]
  
imports: from typing import Dict, Optional, Protocol, TypeVar, Union
  from golem.utilities.data_structures import ComparableEnum
  from fedot.core.composer.metrics import Accuracy, ComplexityMetric, ComputationTime, F1, Logloss, MAE, MAPE, MASE, MSE, MSLE, NodeNum, Precision, QualityMetric, R2, RMSE, ROCAUC, SMAPE, Silhouette, StructuralComplexity
  from fedot.core.data.data import InputData
  from fedot.core.pipelines.pipeline import Pipeline
label_desc: Use image node_id 1 for calling the MetricsRepository obj's underlying member method code with example usage: obj.get_metric(metric_name) and returns: MetricsRepository