return "RIPPER: No model built yet.";
return "JRIP: No model built yet.";
  public String toString() {    if (m_Ruleset == null)       return "RIPPER: No model built yet.";	    StringBuffer sb = new StringBuffer("RIPPER rules:\n"+				       "=============\n\n");     for(int j=0; j<m_RulesetStats.size(); j++){      RuleStats rs = (RuleStats)m_RulesetStats.elementAt(j);      FastVector rules = rs.getRuleset();      for(int k=0; k<rules.size(); k++){	double[] simStats = rs.getSimpleStats(k);	sb.append(((RipperRule)rules.elementAt(k)).toString(m_Class)		  + " ("+simStats[0]+"/"+simStats[4]+")\n");      }			        }    if(m_Debug){      System.err.println("Inside m_Ruleset");      for(int i=0; i<m_Ruleset.size(); i++)	System.err.println(((RipperRule)m_Ruleset.elementAt(i)).toString(m_Class));    }    sb.append("\nNumber of Rules : " 	      + m_Ruleset.size() + "\n");    return sb.toString();  }