[Hama Wiki] Trivial Update of "MultiLayerPerceptron" by YexiJiang

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The "MultiLayerPerceptron" page has been changed by YexiJiang:
https://wiki.apache.org/hama/MultiLayerPerceptron?action=diff&rev1=29&rev2=30

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  === Two class learning problem ===
- To be added...
+ In machine learning, two class learning is a kind of supervised learning problem. Given the instances, the goal of the classifier is to classify them into two classes.
  
  ==== Example: XOR problem ====
  To be added...
  
  
  === Multi class learning problem ===
- To be added...
+ In machine learning, [[http://en.wikipedia.org/wiki/Multiclass_classification|multiclass or multinomial classification]] is the problem of classifying instances into more than two classes.
  
  ==== Example: ====
  To be added...
  
  
  === Regression problem ===
- To be added...
+ From the machine learning perspective, regression problem can be considered as the classification problem where the class label is a continuous value.
  
  ==== Example: Predict the sunspot activity ====
  To be added...