docs: public void statistic(InstanceSet instSet){	
  		int numSamples = instSet.size();
  		for(int i=0;i<numSamples;i++){
  			if(i%1000==0)
  				System.out.println((i+0.0)/numSamples);
  			Instance inst=instSet.get(i);
  			oneStepStatistic(inst);
  		}
  	}