Hi ! This class is deprecated in favor of using

the Datasets library to load the dataset
the Dataset.map function to apply the tokenization

You can check out the run_mlm.py 3 script to see how it loads a text dataset 1 and then applies tokenization.
It should be possible to use the LineByLineWithSOPTextDataet.create_examples_from_document in Dataset.map to get examples in the SOP format.