logger.info("create new Seg ...");
//default max-word
String mode = args.get("mode");
if("simple".equals(mode)) {
logger.info("use simple mode");
seg = new SimpleSeg(dic);
} else if("complex".equals(mode)) {
logger.info("use complex mode");
seg = new ComplexSeg(dic);
} else {
logger.info("use max-word mode");