code: def add_argument(self, name, **kwargs):
      assert name.startswith("--")
      self.parser.add_argument(self.prefix + name[2:], **kwargs)
  
imports: import argparse
  from espnet.utils.dynamic_import import dynamic_import
  from espnet.utils.fill_missing_args import fill_missing_args
label_desc: Use image node_id 2 for calling the _PrefixParser obj's underlying member method code with example usage: obj.add_argument(name) without return types