class_docstr: A container to keep running sum, mean and last value.
class_docstr_tok: ["A","container","to","keep","running","sum",",","mean","and","last","value","."]
code: def update(self, val, n=1):
      self.val = val
      self.sum += val * n
      self.count += n
      self.avg = self.sum / self.count
  
label_desc: Use image node_id 3 for calling the AverageMeter obj's underlying member method code with example usage: obj.update(val, n) without return types