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unconditional guidance with general s!=1.0

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Example: "negative weights"
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Robin Rombach 2022-04-04 22:31:35 +02:00 committed by GitHub
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ldm/models/diffusion/ddim.py
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@ -168,7 +168,7 @@ class DDIMSampler(object):
b, *_, device = *x.shape, x.device
e_t = self.model.apply_model(x, t, c)
if unconditional_guidance_scale > 1.:
if unconditional_guidance_scale != 1.:
assert unconditional_conditioning is not None
e_t_uncond = self.model.apply_model(x, t, unconditional_conditioning)
e_t = e_t_uncond + unconditional_guidance_scale * (e_t - e_t_uncond)