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Perplexity Discrepancy Between Slow and Fast Paths #716

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arman-kazemi opened this issue Apr 1, 2025 · 0 comments
Open

Perplexity Discrepancy Between Slow and Fast Paths #716

arman-kazemi opened this issue Apr 1, 2025 · 0 comments

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@arman-kazemi
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Hi,
I noticed that if the fast-path is disabled for Mamba2, the perplexity of the model increases. I tested a 130M Mamba2 model and the PPL for wikitext measured with eleuther-eval-harness is 31 when using the fast-path and ~38 when not using the fast-path (torch_forward). Do you know why this happens?
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