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 total(self):
      return "{self.sum:{self.fmt}}{self.postfix}".format(self=self)
  
label_desc: Use image node_id 4 for calling the AverageMeter obj's underlying member method code with example usage: obj.total() and returns: str