class_docstr: Computes min label position metric.
code: def extract_output(
      self, accumulator: _TJURDiscriminationAccumulator
  ) -> Dict[metric_types.MetricKey, _TJURDiscriminationAccumulator]:
      return {self._key: accumulator}
  
imports: from typing import Any, Dict, Iterable, Optional
  import apache_beam
  from tensorflow_model_analysis.metrics import metric_types
  from tensorflow_model_analysis.metrics import metric_util
  from tensorflow_model_analysis.proto import config_pb2
label_desc: Use image node_id 5 for calling the _TJURDiscriminationCombiner obj's underlying member method code with example usage: obj.extract_output(accumulator) and returns: dict