code: def __init__(self, *args, **kwargs):
      """
      To initialize the Reweighter, users should provide specific methods to let reweighter do the reweighting (such as sample-wise, rule-based).
      """
      raise NotImplementedError()
  
label_desc: Use image node_id 1 to create a new Reweighter object  with example: obj = Reweighter()