def initialize(self):
        for h in self.before_load_handlers:
            logger.info("Running before_load handler %s", h.__doc__)
            h(self)
Apply ``self.span_tokenize()`` to each element of ``strings``.  I.e.:
dataset/ETHPy150Open lsaffre/lino/lino/utils/dpy.py/LoaderBase.initialize--crossover with--dataset/ETHPy150Open reefeed/wanish/wanish/tokenizers.py/TokenizerI.batch_span_tokenize