class_docstr: Add Suffix to src (& tgt) sentence.
docstr: Get special vocabs added by suffix transform.
docstr_tok: ["Get","special","vocabs","added","by","suffix","transform","."]
code: def get_specials(cls, opts):
      """Get special vocabs added by suffix transform."""
      suffix_dict = cls.get_suffix_dict(opts)
      src_specials, tgt_specials = set(), set()
      for _, suffix in suffix_dict.items():
          src_specials.update(suffix["src"].split())
          tgt_specials.update(suffix["tgt"].split())
      return (src_specials, tgt_specials)
  
imports: from onmt.utils.logging import logger
  from onmt.transforms import register_transform
  from .transform import Transform, ObservableStats
label_desc: Use image node_id 5 for calling the SuffixTransform obj's underlying member method code with example usage: obj.get_specials(cls, opts) and returns: src_specials,  tgt_specials