Update transformer.ipynb to use a saved `text.BertTokenizer` Add a simple `lookup` method to the export in `subword_tokenizers.ipynb` to get subword-token-texts for `transformers.ipynb`.
Update transformer.ipynb to use a saved `text.BertTokenizer`
Add a simple `lookup` method to the export in `subword_tokenizers.ipynb` to get subword-token-texts for `transformers.ipynb`.

PiperOrigin-RevId: 355268479

tensorflow/text,tensorflow/text,tensorflow/text