ntum and min_momentum is None,
                                 default momentum for Adam is used.
                                 (only used if optimizer is Adam)
        min_momentum(float):     minimum momentum when momentum is cycled
                                 If both max_momentum and min_momentum is None,
                                 default momentum for Adam is used.
                                 (only used if optimizer is Adam)
        verbose (bool):          If True, will print inform