code: def delete_model(self, model, retry=DEFAULT_RETRY, not_found_ok=False):
          
          if isinstance(model, str):
              model = ModelReference.from_string(model, default_project=self.project)
  
          if not isinstance(model, (Model, ModelReference)):
              raise TypeError("model must be a Model or a ModelReference")
  
          try:
              self._call_api(retry, method="DELETE", path=model.path)
          except google.api_core.exceptions.NotFound:
              if not not_found_ok:
                  raise
docs: [Beta] Delete a model
  
          See
          https://cloud.google.com/bigquery/docs/reference/rest/v2/models/delete
  
          Args:
              model (Union[ \
                  :class:`~google.cloud.bigquery.model.Model`, \
                  :class:`~google.cloud.bigquery.model.ModelReference`, \
                  str, \
              ]):
                  A reference to the model to delete. 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.
              not_found_ok (bool):
                  Defaults to ``False``. If ``True``, ignore "not found" errors
                  when deleting the model.