Where does max_vocab go in datablock api?

I want to build a language model. To do this, I try to load data (a lot of it!) using datablock api like this:

data = TextList.from_folder("./corpus/extracted/", recurse=True).\
                random_split_by_pct(0.1).\
                label_for_lm().\
                databunch(bs=bs)

However, I keep getting OOM errors, so I guess I need to limit my vocabulary size. However, from_folder does not seem to accept max_vocab argument, which causes an exception. Where do I plug it in datablock API?

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