code: def register_main(subparser) -> "None":
      parser = subparser.add_parser(
          "combine",
          help="Combine parallelized benchmark metrics.",
          description="Combine parallelized benchmark metrics.",
      )
      parser.add_argument(
          "--output", "-o", type=str, required=True, help="Output file."
      )
      parser.add_argument(
          "files", type=str, nargs="*", help="JSON files to çombine."
      )
      parser.set_defaults(
          main=lambda args: combine(args.output, args.files)
      )
  
imports: import collections
  import json
  import logging
  from .None import init_logging
label_desc: Use image node_id 2 for calling a global function with example usage: register_main(subparser) without return types