public void AddWord(string word, int freq = 0, string tag = null)
{
if (freq <= 0)
{
freq = WordDict.SuggestFreq(word, Cut(word, hmm: false));
}
WordDict.AddWord(word, freq);
// Add user word tag of POS
if (!string.IsNullOrEmpty(tag))
{
UserWordTagTab[word] = tag;
}
}