Equivalent to pickle.loads except that the HoloViews trees is
        restored appropriately.

def loads(cls, pickle_string):
        """
        Equivalent to pickle.loads except that the HoloViews trees is
        restored appropriately.
        """
        cls.load_counter_offset = StoreOptions.id_offset()
        val = pickle.loads(pickle_string)
        cls.load_counter_offset = None
        return val