code: def add_args(parser):
      # fmt: off
          parser.add_argument('--save-predictions', metavar='FILE',
                              help='file to save predictions to')
          parser.add_argument('--ranking-head-name',
                              default='sentence_classification_head',
                              help='name of the ranking head to use')
  
file_path: fairseq/fairseq/criterions/sentence_ranking.py
imports: import math
  import torch
  import torch.nn.functional
  from fairseq import utils
  from fairseq.logging import metrics
  from fairseq.criterions import FairseqCriterion, register_criterion
label_desc: Use image node_id 3 for calling the SentenceRankingCriterion obj's underlying member method code with example usage: obj.add_args(parser) without return types