Github user bgreeven commented on the pull request:

    https://github.com/apache/spark/pull/1290#issuecomment-67267487
  
    @avulanov @jkbradley 
    
    An advantage of the string is that you can pass it as an opaque from the 
ANNClassifier class to the ArtificialNeuralNetwork class, i.e. the 
ANNClassifier class will work with whatever optimiser is defined in the string, 
without actually knowing about it.


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