def _additional_imports(model_name):
    """
    Adds additional imports for experimental models.
    """
    if model_name == 'IterativeImputer':
        return ["from sklearn.experimental import enable_iterative_imputer  # pylint: disable=W0611"]
    if model_name in ('HistGradientBoostingClassifier', 'HistGradientBoostingClassifier'):
        return ["from sklearn.experimental import enable_hist_gradient_boosting  # pylint: disable=W0611"]
    return None