Exclude several user roles from buddypress loop

bp-custom.php

<?php

function exclude_roles_from_members_loop( $retval ) {
    if ( bp_is_members_directory() ) {
		$exclude_ids = get_users(
			array(
                 'fields' => 'ID',
                 'role__in' => array( 'editor', 'author' ) // change the roles here
			)
		);
        $retval['exclude'] = $exclude_ids;
    }
    return $retval;
}
add_filter( 'bp_before_has_members_parse_args', 'exclude_roles_from_members_loop' );