class Charts:
    """Stub for visualization charts. To be implemented."""
    def __init__(self, *args, **kwargs):
        pass

    def create_experiment_chart(self, experiment_id):
        raise NotImplementedError("Experiment chart creation is not yet implemented.")

    def create_metrics_chart(self, experiment_id):
        raise NotImplementedError("Metrics chart creation is not yet implemented.")

    def create_optimization_chart(self, experiment_id):
        raise NotImplementedError("Optimization chart creation is not yet implemented.") 