JapaneseTokenizer t = new JapaneseTokenizer(userDictionary, discartPunctuation, mode);
        int nBestCost = this.nBestCost;
        if (nBestExamples != null) {
            nBestCost = Math.max(nBestCost, t.calcNBestCost(nBestExamples));
        }
        t.setNBestCost(nBestCost);
        return t;
    }