code: def add_subparser(
      self, parser: argparse._SubParsersAction
  ) -> argparse.ArgumentParser:
      description = """Print results from allennlp training runs in a helpful CSV format."""
      subparser = parser.add_parser(
          self.name,
          description=description,
          help="Print results from allennlp serialization directories to the console.",
      )
      subparser.add_argument(
          "path",
          type=str,
          help="Path to recursively search for allennlp serialization directories.",
      )
  
      subparser.add_argument(
          "-k",
          "--keys",
          type=str,
          nargs="+",
          help="Keys to print from metrics.json."
          'Keys not present in all metrics.json will result in "N/A"',
          default=None,
          required=False,
      )
      subparser.add_argument(
          "-m",
          "--metrics-filename",
          type=str,
          help="Name of the metrics file to inspect.",
          default="metrics.json",
          required=False,
      )
  
      subparser.set_defaults(func=print_results_from_args)
      return subparser
  
file_path: allennlp/allennlp/commands/print_results.py
imports: import argparse
  import json
  import logging
  import os
  from allennlp.commands.subcommand import Subcommand
label_desc: Use image node_id 1 for calling the PrintResults obj's underlying member method code with example usage: obj.add_subparser(parser) and returns: subparser