[Hama Wiki] Update of "Neuron" by edwardyoon

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The "Neuron" page has been changed by edwardyoon:
https://wiki.apache.org/hama/Neuron?action=diff&rev1=3&rev2=4

      ann.setLearningRate(0.1);
      ann.setMomemtumWeight(0.1);
  
-     // initialize the topology of the model
+     // initialize the topology of the model and set the activation function 
and parallel degree.
      ann.addLayer(featureDimension, false, Sigmoid.class, numOfTasks);
      ann.addLayer(featureDimension, false, Sigmoid.class, numOfTasks);
      ann.addLayer(labelDimension, true, Sigmoid.class, numOfTasks);