code: public boolean initPosTagger(String modelDir){
  		try{
  			this.vnPosTagger = new MaxentTagger(modelDir);
  		}
  		catch (Exception e){
  			System.out.println("Error while initializing POS TAgger");
  			vnPosTagger = null;
  			return false;
  		}
  		return true;
  	}
docs: Initialize the pos tagger for Vietnamese.
  
  @param modelDir the model dir
  @return true if the initialization is successful and false otherwise