code: def r_package_version():
      return run_r(
          'cat(if(requireNamespace("guildai")) '
          'getNamespaceVersion("guildai") else "")'
      )
  
file_path: guildai/guild/plugins/r_util.py
imports: import os
  import re
  import subprocess
  from guild import util
label_desc: Use image node_id 5 for calling a global function with example usage: r_package_version() and returns: run_r