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 __init__(self, name="", fmt="f", postfix="", need_avg=True):
      self.name = name
      self.fmt = fmt
      self.postfix = postfix
      self.need_avg = need_avg
      self.val = 0
      self.avg = 0
      self.sum = 0
      self.count = 0
  
label_desc: Use image node_id 1 to create a new AverageMeter object  with example: obj = AverageMeter(name, fmt, postfix, need_avg)