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Classifier-Free Guidance Formulation #303

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MoayedHajiAli opened this issue Sep 18, 2023 · 3 comments
Open

Classifier-Free Guidance Formulation #303

MoayedHajiAli opened this issue Sep 18, 2023 · 3 comments

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@MoayedHajiAli
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In the classifier-free guidance paper, the formulation is as follow
image

However, it is implemented in DALL-2 as
null_logits + (logits - null_logits) * cond_scale
According to the formula it should be
logits + (logits - null_logits) * cond_scale
where the logits are the conditional score and null_logits are the unconditional ones.

Can you please clarify the reason for this modification?
Thank you!
@nshidqi
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nshidqi commented Dec 13, 2023

@MoayedHajiAli Have you found the reason?
I'm also wondering why

@tengteng95
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@nshidqi @MoayedHajiAli I also have the same question. May I ask if you have found the reason now?

@MoayedHajiAli
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MoayedHajiAli commented Jan 19, 2024 •
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Hi @tengteng95. I couldn't find the reason

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@tengteng95 @nshidqi @MoayedHajiAli