code: def _normalize_headers(names, count):
      return [
          name if count[name] == 1 else f"{path}:{name}"
          for path in names
          for name in names[path]
      ]
  
imports: import argparse
  import re
  from datetime import date, datetime
  from typing import TYPE_CHECKING, Dict, Iterable
  from funcy import lmap
  from dvc.cli import formatter
  from dvc.cli.command import CmdBase
  from dvc.cli.utils import append_doc_link
  from dvc.commands.metrics import DEFAULT_PRECISION
  from dvc.exceptions import DvcException
  from dvc.log import logger
  from dvc.ui import ui
  from dvc.utils.serialize import encode_exception
label_desc: Use image node_id 4 for calling a global function with example usage: _normalize_headers(names, count) and returns: unknown