calculation of the perplexity score

[deven367]

❓ Questions and Help

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1. search the issues. → couldn't find an answer
2. search the docs. → couldn't find an answer

What is your question?

Why is the perplexity score calculated as (2**avg_nll_loss) instead of the regular exp(avg_nll_loss) https://github.com/facebookresearch/fairseq/blob/bedb259bf34a9fc22073c13a1cee23192fa70ef3/fairseq_cli/eval_lm.py#L200

Was this a deliberate choice made by the fairseq team? or is there some other reason behind it?

cc @b-dickson @zorant

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• fairseq Version (e.g., 1.0 or main): 0.12.2
• PyTorch Version (e.g., 1.0)
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