code: def recall(y, yhat, positive=True):
      """Returns the recall (higher is better).
  
      :param y: true function values
      :param yhat: predicted function values
      :param positive: the positive label
  
      :returns: number of true positive predictions / number of true positives
  
      """
      table = contingency_table(y, yhat, positive)
      return _recall(table)
  
imports: import math
  import operator
label_desc: Use image node_id 16 for calling a global function with example usage: recall(y, yhat, positive) and returns: _recall