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matt-peters avatar matt-peters commented on July 21, 2024

The 39.6 value is the average of the forward and backward perplexities in the 1B Word benchmark held out set. Each was computed in the standard way.

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jiangtongli avatar jiangtongli commented on July 21, 2024

Thanks,and what kind of words you use(correct or the predicted word) in the compute of bench perplexity?

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matt-peters avatar matt-peters commented on July 21, 2024

Perplexity uses the predicted probability of the correct word and is computed as exp(-1 / N * sum_k(ln(prob(w_k)))) for all words w_k in the held out set. If you are unfamiliar with it then I recommend looking for a more detailed description elsewhere.

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