code: def _get_backend_versions():
      import netCDF4
  
      return {
          "netCDF4": Version(netCDF4.__version__),
          "libnetcdf": Version(netCDF4.__netcdf4libversion__),
          "xarray": Version(xr.__version__),
      }
  
file_path: satpy/satpy/writers/cf_writer.py
imports: import copy
  import logging
  import warnings
  import numpy
  import xarray
  from packaging.version import Version
  from satpy.cf.coords import EPOCH
  from satpy.writers import Writer
label_desc: Use image node_id 5 for calling a global function with example usage: _get_backend_versions() and returns: dict