DarthAffe/stable-diffusion.cpp
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chore: give feedback about cfg values smaller than 1 (#1088)

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Wagner Bruna 2025-12-19 12:41:52 -03:00 committed by GitHub
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commit 7c88c4765c
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stable-diffusion.cpp
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@ -1497,6 +1497,17 @@ public:
std::vector<int> skip_layers(guidance.slg.layers, guidance.slg.layers + guidance.slg.layer_count);
float cfg_scale = guidance.txt_cfg;
if (cfg_scale < 1.f) {
if (cfg_scale == 0.f) {
// Diffusers follow the convention from the original paper
// (https://arxiv.org/abs/2207.12598v1), so many distilled model docs
// recommend 0 as guidance; warn the user that it'll disable prompt folowing
LOG_WARN("unconditioned mode, images won't follow the prompt (use cfg-scale=1 for distilled models)");
} else {
LOG_WARN("cfg value out of expected range may produce unexpected results");
}
}
float img_cfg_scale = std::isfinite(guidance.img_cfg) ? guidance.img_cfg : guidance.txt_cfg;
float slg_scale = guidance.slg.scale;