Disable counting characters by default during SeqIO caching. #494
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Disable counting characters by default during SeqIO caching.
Counting characters for stats is highly expensive since it requires detokenizing the entire preprocessed dataset. It is primarily used for character-level mixing functions, which aren't common. If needed, users can enable counting characters by passing an --enable_char_counts flag to the caching script. Also disable in tests for faster runs.