code: def add_args(parser):
      FairseqNATModel.add_args(parser)
      parser.add_argument("--label-tau", default=None, type=float)
  
imports: import numpy
  import torch
  import torch.nn.functional
  from fairseq.models import register_model, register_model_architecture
  from fairseq.models.nat import FairseqNATModel, LevenshteinTransformerDecoder, LevenshteinTransformerModel, ensemble_decoder
  from fairseq.models.transformer import Linear
  from fairseq.modules.transformer_sentence_encoder import init_bert_params
  from fairseq.utils import new_arange
label_desc: Use image node_id 2 for calling the InsertionTransformerModel obj's underlying member method code with example usage: obj.add_args(parser) without return types