class_docstr: The TextAttack train module:
  
  A command line parser to train a model from user specifications.
class_docstr_tok: ["The","TextAttack","train","module",":","A","command","line","parser","to","train","a","model","from","user","specifications","."]
code: def register_subcommand(main_parser: ArgumentParser):
      parser = main_parser.add_parser(
          "train",
          help="train a model for sequence classification",
          formatter_class=ArgumentDefaultsHelpFormatter,
      )
      parser = CommandLineTrainingArgs._add_parser_args(parser)
      parser.set_defaults(func=TrainModelCommand())
  
imports: from argparse import ArgumentDefaultsHelpFormatter, ArgumentParser
  from textattack import CommandLineTrainingArgs, Trainer
  from textattack.commands import TextAttackCommand
label_desc: Use image node_id 2 for calling the TrainModelCommand obj's underlying member method code with example usage: obj.register_subcommand(main_parser) without return types