code: def get_model(self, model_ref, retry=DEFAULT_RETRY):
          
          if isinstance(model_ref, str):
              model_ref = ModelReference.from_string(
                  model_ref, default_project=self.project
              )
  
          api_response = self._call_api(retry, method="GET", path=model_ref.path)
          return Model.from_api_repr(api_response)
docs: [Beta] Fetch the model referenced by ``model_ref``.
  
           Args:
              model_ref (Union[ \
                  :class:`~google.cloud.bigquery.model.ModelReference`, \
                  str, \
              ]):
                  A reference to the model to fetch from the BigQuery API.
                  If a string is passed in, this method attempts to create a
                  model reference from a string using
                  :func:`google.cloud.bigquery.model.ModelReference.from_string`.
              retry (:class:`google.api_core.retry.Retry`):
                  (Optional) How to retry the RPC.
  
           Returns:
              google.cloud.bigquery.model.Model:
                  A ``Model`` instance.