class_docstr: Computes minimum label position.
code: def _get_label(self, fpl: query_types.FPL) -> float:
      result = fpl["labels"].get(self._label_key)
      if result is None:
          return 0.0
      return result
  
file_path: model-analysis/tensorflow_model_analysis/evaluators/query_metrics/min_label_position.py
imports: from typing import Any, Dict, Iterable, NamedTuple
  import apache_beam
  from tensorflow_model_analysis.eval_saved_model import constants
  from tensorflow_model_analysis.eval_saved_model import util
  from tensorflow_model_analysis.evaluators.query_metrics import query_types
  from tensorflow_model_analysis.post_export_metrics import metric_keys
label_desc: Use image node_id 2 for calling the MinLabelPositionCombineFn obj's underlying member method code with example usage: obj._get_label(fpl) and returns: result, int