public static function init($options = array())
{
$defaults = array('mode' => 'default');
$options = array_merge($defaults, $options);
self::$prob_start = self::loadModel(dirname(dirname(__FILE__)) . '/model/prob_start.json');
self::$prob_trans = self::loadModel(dirname(dirname(__FILE__)) . '/model/prob_trans.json');
self::$prob_emit = self::loadModel(dirname(dirname(__FILE__)) . '/model/prob_emit.json');
}