code: public static SplitWord get(String key) {
  
          KV<String, SplitWord> kv = CRF.get(key);
  
          if (kv == null) {
              if (MyStaticValue.ENV.containsKey(key)) {
                  putIfAbsent(key, MyStaticValue.ENV.get(key));
                  return get(key);
              }
              LOG.warn("crf " + key + " not found in config ");
              return null;
          }
  
          SplitWord sw = kv.getV();
          if (sw == null) {
              sw = initCRFModel(kv);
          }
          return sw;
      }
docs: 根据key获取crf分词器
  
  @param key
  @return crf分词器