[jira] [Created] (SINGA-60) Make the learning rate change modular

["wangwei (JIRA)" <ji...@apache.org>]

wangwei created SINGA-60:
----------------------------

             Summary: Make the learning rate change modular
                 Key: SINGA-60
                 URL: https://issues.apache.org/jira/browse/SINGA-60
             Project: Singa
          Issue Type: Improvement
            Reporter: wangwei


The learning rate of SGD typically changes through time.
There are many different ways to change the learning rate of SGD. SINGA has implemented a couple of changing methods. But users may want to implement their own changing method. To make this part modular, this ticket is going to create a base learning rate generator called LRGen, which is declared like,

{code}
class LRGen {
  public:
    virtual float operator() (int step) = 0;
  protected:
   LRProto proto_;
};
{code}

Users can then inherit LRGen to implement the their own changing algorithm in the `operator()(int step)`.

Users can also add configurations for their generator by extending the base LRProto.





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