def update()

in ax/modelbridge/base.py [0:0]


    def update(self, new_data: Data, experiment: Experiment) -> None:
        """Update the model bridge and the underlying model with new data. This
        method should be used instead of `fit`, in cases where the underlying
        model does not need to be re-fit from scratch, but rather updated.

        Note: `update` expects only new data (obtained since the model initialization
        or last update) to be passed in, not all data in the experiment.

        Args:
            new_data: Data from the experiment obtained since the last call to
                `update`.
            experiment: Experiment, in which this data was obtained.
        """
        t_update_start = time.time()
        observations = (
            observations_from_data(
                experiment=experiment,
                data=new_data,
                include_abandoned=self._fit_abandoned,
            )
            if experiment is not None and new_data is not None
            else []
        )
        obs_feats_raw, obs_data_raw = self._extend_training_data(
            observations=observations
        )
        obs_feats, obs_data, search_space = self._transform_data(
            obs_feats=obs_feats_raw,
            obs_data=obs_data_raw,
            search_space=self._model_space,
            transforms=self._raw_transforms,
            transform_configs=self._transform_configs,
        )
        self._update(
            search_space=search_space,
            observation_features=obs_feats,
            observation_data=obs_data,
        )
        self.fit_time += time.time() - t_update_start
        self.fit_time_since_gen += time.time() - t_update_start