mT5分类增强 微调报modelscope错误怎么解决？

raise ValueError(
ValueError: Couldn't instantiate the backend tokenizer from one of:
(1) a tokenizers library serialization file,
(2) a slow tokenizer instance to convert or
(3) an equivalent slow tokenizer class to instantiate and convert.
You need to have sentencepiece installed to convert a slow tokenizer to a fast one.

mT5分类增强 微调报modelscope错误怎么解决啊？