def METHOD_NAME(check_explanation):
    explainer = Explainer(
        model=ChebConv(3, 1, K=2),
        algorithm=GNNExplainer(epochs=2),
        explanation_type='model',
        node_mask_type='object',
        edge_mask_type='object',
        model_config=dict(
            mode='binary_classification',
            task_level='node',
            return_type='raw',
        ),
    )
    explanation = explainer(x, edge_index)
    assert explainer.algorithm.node_mask is None
    assert explainer.algorithm.edge_mask is None
    check_explanation(explanation, MaskType.object, MaskType.object)