text: from __future__ import print_function, absolute_import
  
  __all__ = ['accuracy', 'precision']
  
  def accuracy(output, target, topk=(1,)):
      """Computes the precision@k for the specified values of k"""
      maxk = max(topk)
      batch_size = target.size(0)
  
      _, pred = output.topk(maxk, 1, True, True)
      pred = pred.t()
      correct = pred.eq(target.view(1, -1).expand_as(pred))
  
      res = []
      for k in topk:
          correct_k = correct[:k].contiguous().view(-1).float().sum(0)
          res.append(correct_k.mul_(100.0 / batch_size))
      return res
  
  def precision(output, target):
      pass