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Serialize the optimizer configuration to JSON compatible python dict.

The configuration can be used for persistence and reconstruct the Optimizer instance again.

{'class_name': 'SGD', 'config': {'name': 'SGD', 'learning_rate': 0.01,
                                 'decay': 0.0, 'momentum': 0.0,
                                 'nesterov': False} }

optimizer An Optimizer instance to serialize.

Python dict which contains the configuration of the input optimizer.