docs: public void loadThruStagePipesForMultiCorpus(Reader[] readers, String[] corpusNames) throws Exception {
          SeriesPipes p = (SeriesPipes) pipes;
          // 通过迭代加入样本
          Pipe p1 = p.getPipe(0);
          for(int i = 0; i < readers.length; i++) {
  	        while (readers[i].hasNext()) {
  	            Instance inst = readers[i].next();
  	            inst.setClasue(corpusNames[i]);
  	            if(inst!=null){
  	                if (p1 != null)
  	                    p1.addThruPipe(inst);
  	                this.add(inst);
  	            };
  	        }
          }
          
          for (int i = 1; i < p.size(); i++)
              p.getPipe(i).process(this);
      }