DarthAffe/stable-diffusion.cpp
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feat: add flow shift parameter (for SD3 and Wan) (#780)

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* Add flow shift parameter (for SD3 and Wan)

* unify code style and fix some issues

---------

Co-authored-by: leejet <leejet714@gmail.com>
This commit is contained in:
stduhpf 2025-09-06 20:16:59 +02:00 committed by GitHub
parent 21ce9fe2cf
commit 141a4b4113
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GPG Key ID: B5690EEEBB952194
4 changed files with 21 additions and 5 deletions
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3
denoiser.hpp
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@ -382,7 +382,8 @@ struct DiscreteFlowDenoiser : public Denoiser {
float sigma_data = 1.0f;
DiscreteFlowDenoiser() {
DiscreteFlowDenoiser(float shift = 3.0f)
: shift(shift) {
set_parameters();
}

9
examples/cli/main.cpp
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@ -115,6 +115,7 @@ struct SDParams {
bool chroma_use_dit_mask = true;
bool chroma_use_t5_mask = false;
int chroma_t5_mask_pad = 1;
float flow_shift = INFINITY;
SDParams() {
sd_sample_params_init(&sample_params);
@ -171,6 +172,7 @@ void print_params(SDParams params) {
printf(" sample_params: %s\n", SAFE_STR(sample_params_str));
printf(" high_noise_sample_params: %s\n", SAFE_STR(high_noise_sample_params_str));
printf(" moe_boundary: %.3f\n", params.moe_boundary);
printf(" flow_shift: %.2f\n", params.flow_shift);
printf(" strength(img2img): %.2f\n", params.strength);
printf(" rng: %s\n", sd_rng_type_name(params.rng_type));
printf(" seed: %ld\n", params.seed);
@ -278,8 +280,9 @@ void print_usage(int argc, const char* argv[]) {
printf(" --chroma-t5-mask-pad PAD_SIZE t5 mask pad size of chroma\n");
printf(" --video-frames video frames (default: 1)\n");
printf(" --fps fps (default: 24)\n");
printf(" --moe-boundary BOUNDARY Timestep boundary for Wan2.2 MoE model. (default: 0.875)\n");
printf(" Only enabled if `--high-noise-steps` is set to -1\n");
printf(" --moe-boundary BOUNDARY timestep boundary for Wan2.2 MoE model. (default: 0.875)\n");
printf(" only enabled if `--high-noise-steps` is set to -1\n");
printf(" --flow-shift SHIFT shift value for Flow models like SD3.x or WAN (default: auto)\n");
printf(" -v, --verbose print extra info\n");
}
@ -514,6 +517,7 @@ void parse_args(int argc, const char** argv, SDParams& params) {
{"", "--style-ratio", "", &params.style_ratio},
{"", "--control-strength", "", &params.control_strength},
{"", "--moe-boundary", "", &params.moe_boundary},
{"", "--flow-shift", "", &params.flow_shift},
};
options.bool_options = {
@ -1181,6 +1185,7 @@ int main(int argc, const char* argv[]) {
params.chroma_use_dit_mask,
params.chroma_use_t5_mask,
params.chroma_t5_mask_pad,
params.flow_shift,
};
sd_ctx_t* sd_ctx = new_sd_ctx(&sd_ctx_params);

13
stable-diffusion.cpp
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@ -681,7 +681,11 @@ public:
if (sd_version_is_sd3(version)) {
LOG_INFO("running in FLOW mode");
denoiser = std::make_shared<DiscreteFlowDenoiser>();
float shift = sd_ctx_params->flow_shift;
if (shift == INFINITY) {
shift = 3.0;
}
denoiser = std::make_shared<DiscreteFlowDenoiser>(shift);
} else if (sd_version_is_flux(version)) {
LOG_INFO("running in Flux FLOW mode");
float shift = 1.0f; // TODO: validate
@ -694,7 +698,11 @@ public:
denoiser = std::make_shared<FluxFlowDenoiser>(shift);
} else if (sd_version_is_wan(version)) {
LOG_INFO("running in FLOW mode");
denoiser = std::make_shared<DiscreteFlowDenoiser>();
float shift = sd_ctx_params->flow_shift;
if (shift == INFINITY) {
shift = 5.0;
}
denoiser = std::make_shared<DiscreteFlowDenoiser>(shift);
} else if (is_using_v_parameterization) {
LOG_INFO("running in v-prediction mode");
denoiser = std::make_shared<CompVisVDenoiser>();
@ -1553,6 +1561,7 @@ void sd_ctx_params_init(sd_ctx_params_t* sd_ctx_params) {
sd_ctx_params->chroma_use_dit_mask = true;
sd_ctx_params->chroma_use_t5_mask = false;
sd_ctx_params->chroma_t5_mask_pad = 1;
sd_ctx_params->flow_shift = INFINITY;
}
char* sd_ctx_params_to_str(const sd_ctx_params_t* sd_ctx_params) {

1
stable-diffusion.h
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@ -142,6 +142,7 @@ typedef struct {
bool chroma_use_dit_mask;
bool chroma_use_t5_mask;
int chroma_t5_mask_pad;
float flow_shift;
} sd_ctx_params_t;
typedef struct {