code: def _nnabla_version():
      import nnabla
      import nnabla.utils.callback as callback
  
      version_string = "Version:{}, Build:{}".format(
          nnabla.__version__, nnabla.__build_number__
      )
      callback_version_string = callback.get_callback_version()
      if callback_version_string is not None:
          version_string += ", Callback:{}".format(
              callback_version_string
          )
      return version_string
  
file_path: nnabla/python/src/nnabla/utils/cli/cli.py
imports: import argparse
  import os
  import sys
  import warnings
  from nnabla.logger import logger
label_desc: Use image node_id 1 for calling a global function with example usage: _nnabla_version() and returns: version_string