Is it safe to assume tokenizer does not change after initialization?
Hi, I find many attributes intokenizerare very expensive to compute, e.g.def __len__(self):
        """
        Size of the full vocabulary with the added tokens. Counts the `keys` and not the `values` because otherwise if
        there is a hole in the vocab, we will add tokenizers at a wrong index.
        """
        return len(set(self.get_vocab().keys()))Therefore, I want to cache the results of some attributes ontokenizer. I do see some functions that can change a tokenizer, but I find they are only used during initialization, and these methods are marked as private by an_prefix, e.g._update_trie/_add_tokens.Is it safe to assume a tokenizer does not change after initialization? If not, what are some typical use cases to change a tokenizer after initialization?