How does the inclusion of between-sentence tokens or separate begin- and end-sentence tokens affect the computation of perplexity in language models?

Question

Answer

It decreases perplexity by providing clearer sentence boundaries

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It has no impact on the perplexity calculation

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It increases the perplexity by introducing additional tokens in the vocabulary

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We do not know how exactly, it only adjusts the total count of word tokens considered in the perplexity calculation

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