code: def _calc_recall(
      tp: float, fp: float, fn: float
  ) -> float:  # pylint: disable=unused-argument
      """Calculate recall for given matches and number of positives."""
      if tp + fn == 0:
          return -1
      rc = tp / (tp + fn + np.finfo(float).eps)
      return rc
  
imports: import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: _calc_recall(tp, fp, fn) and returns: rc, unknown