Documentation/Modules/ClassesModules
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				Need for Classes
Modules are connected. The information passed between these Modules may be a class of type
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Solutions in the case of an optimization or -  
Datain the case of learning 
Often, Modules look similar, and someone writing a new Module doesn't want to implement all interface methods by hand. 
For these cases, we wrote the abstract classes
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Optimizers in the case of an optimization algorithm -  
Problems in the case of an optimization problem -  
Learners in the case of a learning algorithm 
These classes already implement most of the necessary methods. A writer of an optimizer just has to implement the algorithm itself and no other details such as checking or connecting.
Similarly, a writer of a problem just has to implement the  evaluate(...) method of the Problem class. 
In a learner, the method to override is run() . It executes the learning algorithm.