Please Help with Form Validation Hmvc

I am Using HMVC with Codeigniter 3.
I am trying to make custom validation callback function and its not working with HMVC.
I get solution from searching in google like.

PHP Code:

class MY_Form_validation extends CI_Form_validation {

    function run($module = '', $group = '')
    {
        (is_object($module)) AND $this->CI = &$module;
        return parent::run($group);
    }

} 


But its not working for me.
Help me