DarthAffe/stable-diffusion.cpp
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feat: optimize cfg special cases with guidance schdeule (#2033)

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stduhpf 2026-09-24 19:10:22 +02:00 committed by GitHub
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commit caa111adf3
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3 changed files with 88 additions and 27 deletions
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56
src/pipeline/diffusion_engine.cpp
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@ -2441,6 +2441,7 @@ sd::Tensor<float> StableDiffusionGGML::sample(const std::shared_ptr<DiffusionMod
timesteps_tensor,
cond,
&controls);
bool uncond_controls_ready = false;
static const std::vector<sd::Tensor<float>> empty_ref_latents;
bool uncond_without_ref_latents = !img_uncond.empty() &&
@ -2530,6 +2531,17 @@ sd::Tensor<float> StableDiffusionGGML::sample(const std::shared_ptr<DiffusionMod
return std::move(cached_output);
}
// A re-enabled condition can miss the cache even when the positive pass was reused.
if (!uncond_controls_ready && !uncond.empty() &&
(&condition == &uncond || &condition == &img_uncond)) {
compute_sample_controls(control_image,
noised_input,
timesteps_tensor,
uncond,
&controls);
uncond_controls_ready = true;
}
for (const auto& extension : generation_extensions) {
extension->before_diffusion(diffusion_params, step);
}
@ -2569,19 +2581,39 @@ sd::Tensor<float> StableDiffusionGGML::sample(const std::shared_ptr<DiffusionMod
}
}
float effective_guidance_scale = guidance_schedule.empty()
? cfg_scale
: guidance_schedule[guidance_schedule.size() - 1 - step];
float image_guidance_scale = img_cfg_scale;
constexpr float kEpsilon = 1e-5f;
bool skip_uncond = false;
if (!uncond.empty() && !needs_uncond_denoised && !use_apg_guidance) {
if (!img_uncond.empty()) {
skip_uncond = std::abs(image_guidance_scale - effective_guidance_scale) < kEpsilon;
} else {
skip_uncond = std::abs(effective_guidance_scale - 1.0f) < kEpsilon;
}
}
bool skip_img_uncond = false;
if (!img_uncond.empty() && !needs_uncond_denoised && !use_apg_guidance) {
if (!uncond.empty()) {
skip_img_uncond = std::abs(image_guidance_scale - 1.0f) < kEpsilon;
} else {
skip_img_uncond = std::abs(effective_guidance_scale - 1.0f) < kEpsilon;
}
}
cond_out = run_condition(*positive_condition, c_concat_override);
if (cond_out.empty()) {
return {};
}
if (!uncond.empty()) {
if (!step_cache.is_step_skipped()) {
compute_sample_controls(control_image,
noised_input,
timesteps_tensor,
uncond,
&controls);
}
if (!skip_uncond) {
const std::vector<int>* uncond_skip_layers = nullptr;
if (is_skiplayer_step && slg_uncond) {
LOG_VERBOSE("Skipping layers at uncond step %d\n", step);
@ -2595,8 +2627,13 @@ sd::Tensor<float> StableDiffusionGGML::sample(const std::shared_ptr<DiffusionMod
if (uncond_out.empty()) {
return {};
}
} else {
step_cache.invalidate_condition(&uncond);
}
}
if (!img_uncond.empty()) {
if (!skip_img_uncond) {
img_uncond_out = run_condition(img_uncond,
img_uncond.c_concat.empty() ? nullptr : &img_uncond.c_concat,
nullptr,
@ -2605,6 +2642,9 @@ sd::Tensor<float> StableDiffusionGGML::sample(const std::shared_ptr<DiffusionMod
if (img_uncond_out.empty()) {
return {};
}
} else {
step_cache.invalidate_condition(&img_uncond);
}
}
sd::guidance::GuidanceInput guidance_input;
guidance_input.step = step;
@ -2613,7 +2653,7 @@ sd::Tensor<float> StableDiffusionGGML::sample(const std::shared_ptr<DiffusionMod
guidance_input.pred_uncond = uncond_out.empty() ? nullptr : &uncond_out;
guidance_input.pred_img_uncond = img_uncond_out.empty() ? nullptr : &img_uncond_out;
sd::guidance::GuiderOutput guided = guidance_schedule.empty() ? primary_guidance.forward(guidance_input, {}) : primary_guidance.forward(guidance_input, {}, guidance_schedule[guidance_schedule.size() - 1 - step]);
sd::guidance::GuiderOutput guided = primary_guidance.forward(guidance_input, {}, effective_guidance_scale);
if (guided.pred.empty()) {
return {};
}

20
src/runtime/sample-cache.cpp
View File

@ -275,6 +275,26 @@ namespace sd_sample {
}
}
void SampleStepCacheDispatcher::invalidate_condition(const void* condition) {
if (condition == nullptr) {
return;
}
switch (runtime.mode) {
case SampleCacheMode::EASYCACHE:
runtime.easycache.cache_diffs.erase(condition);
break;
case SampleCacheMode::UCACHE:
runtime.ucache.cache_diffs.erase(condition);
break;
case SampleCacheMode::CACHEDIT:
runtime.cachedit.cache_diffs.erase(condition);
break;
case SampleCacheMode::NONE:
break;
}
}
bool SampleStepCacheDispatcher::is_step_skipped() const {
switch (runtime.mode) {
case SampleCacheMode::EASYCACHE:

1
src/runtime/sample-cache.h
View File

@ -46,6 +46,7 @@ namespace sd_sample {
bool before_condition(const void* condition, const sd::Tensor<float>& input, sd::Tensor<float>* output);
void after_condition(const void* condition, const sd::Tensor<float>& input, const sd::Tensor<float>& output);
void invalidate_condition(const void* condition);
bool is_step_skipped() const;
};