class_docstr: Statistics for binary decision,
  including precision, recall, false positive, false negative
code: def recall(self):
      if self.nr_pos == 0:
          return 0
      return self.corr_pos * 1.0 / self.nr_pos
  
imports: import numpy
label_desc: Use image node_id 5 for calling the BinaryStatistics obj's underlying member method code with example usage: obj.recall() and returns: unknown, int