code: def _get_converter_module(sk_obj):
      
      try:
          cv_idx = _converter_lookup[sk_obj.__class__]
      except KeyError:
          raise ValueError(
                  "Transformer '%s' not supported; supported transformers are %s."
                  % (repr(sk_obj),
                      ",".join(k.__name__ for k in _converter_module_list)))
  
      return _converter_module_list[cv_idx]
docs: Returns the module holding the conversion functions for a
      particular model).