feat: add CosXL support (#683)

Author: stduhpf

denoiser.hpp

@@ -168,24 +168,21 @@ struct AYSSchedule : SigmaSchedule {
         std::vector<float> inputs;
         std::vector<float> results(n + 1);
 
-        switch (version) {
-            case VERSION_SD2: /* fallthrough */
-                LOG_WARN("AYS not designed for SD2.X models");
-            case VERSION_SD1:
-                LOG_INFO("AYS using SD1.5 noise levels");
-                inputs = noise_levels[0];
-                break;
-            case VERSION_SDXL:
-                LOG_INFO("AYS using SDXL noise levels");
-                inputs = noise_levels[1];
-                break;
-            case VERSION_SVD:
-                LOG_INFO("AYS using SVD noise levels");
-                inputs = noise_levels[2];
-                break;
-            default:
-                LOG_ERROR("Version not compatable with AYS scheduler");
-                return results;
+        if (sd_version_is_sd2((SDVersion)version)) {
+            LOG_WARN("AYS not designed for SD2.X models");
+        } /* fallthrough */
+        else if (sd_version_is_sd1((SDVersion)version)) {
+            LOG_INFO("AYS using SD1.5 noise levels");
+            inputs = noise_levels[0];
+        } else if (sd_version_is_sdxl((SDVersion)version)) {
+            LOG_INFO("AYS using SDXL noise levels");
+            inputs = noise_levels[1];
+        } else if (version == VERSION_SVD) {
+            LOG_INFO("AYS using SVD noise levels");
+            inputs = noise_levels[2];
+        } else {
+            LOG_ERROR("Version not compatable with AYS scheduler");
+            return results;
         }
 
         /* Stretches those pre-calculated reference levels out to the desired
@@ -346,6 +343,31 @@ struct CompVisVDenoiser : public CompVisDenoiser {
     }
 };
 
+struct EDMVDenoiser : public CompVisVDenoiser {
+    float min_sigma = 0.002;
+    float max_sigma = 120.0;
+
+    EDMVDenoiser(float min_sigma = 0.002, float max_sigma = 120.0) : min_sigma(min_sigma), max_sigma(max_sigma) {
+        schedule = std::make_shared<ExponentialSchedule>();
+    }
+
+    float t_to_sigma(float t) {
+        return std::exp(t * 4/(float)TIMESTEPS);
+    }
+
+    float sigma_to_t(float s) {
+        return 0.25 * std::log(s);
+    }
+
+    float sigma_min() {
+        return min_sigma;
+    }
+
+    float sigma_max() {
+        return max_sigma;
+    }
+};
+
 float time_snr_shift(float alpha, float t) {
     if (alpha == 1.0f) {
         return t;

stable-diffusion.cpp

@@ -103,6 +103,9 @@ class StableDiffusionGGML {
     bool vae_tiling           = false;
     bool stacked_id           = false;
 
+    bool is_using_v_parameterization     = false;
+    bool is_using_edm_v_parameterization = false;
+
     std::map<std::string, struct ggml_tensor*> tensors;
 
     std::string lora_model_dir;
@@ -543,12 +546,17 @@ class StableDiffusionGGML {
         LOG_INFO("loading model from '%s' completed, taking %.2fs", model_path.c_str(), (t1 - t0) * 1.0f / 1000);
 
         // check is_using_v_parameterization_for_sd2
-        bool is_using_v_parameterization = false;
+
         if (sd_version_is_sd2(version)) {
             if (is_using_v_parameterization_for_sd2(ctx, sd_version_is_inpaint(version))) {
                 is_using_v_parameterization = true;
             }
         } else if (sd_version_is_sdxl(version)) {
+            if (model_loader.tensor_storages_types.find("edm_vpred.sigma_max") != model_loader.tensor_storages_types.end()) {
+                // CosXL models
+                // TODO: get sigma_min and sigma_max values from file
+                is_using_edm_v_parameterization = true;
+            }
             if (model_loader.tensor_storages_types.find("v_pred") != model_loader.tensor_storages_types.end()) {
                 is_using_v_parameterization = true;
             }
@@ -573,6 +581,9 @@ class StableDiffusionGGML {
         } else if (is_using_v_parameterization) {
             LOG_INFO("running in v-prediction mode");
             denoiser = std::make_shared<CompVisVDenoiser>();
+        } else if (is_using_edm_v_parameterization) {
+            LOG_INFO("running in v-prediction EDM mode");
+            denoiser = std::make_shared<EDMVDenoiser>();
         } else {
             LOG_INFO("running in eps-prediction mode");
         }
@@ -1396,7 +1407,7 @@ sd_image_t* generate_image(sd_ctx_t* sd_ctx,
     SDCondition uncond;
     if (cfg_scale != 1.0) {
         bool force_zero_embeddings = false;
-        if (sd_version_is_sdxl(sd_ctx->sd->version) && negative_prompt.size() == 0) {
+        if (sd_version_is_sdxl(sd_ctx->sd->version) && negative_prompt.size() == 0 && !sd_ctx->sd->is_using_edm_v_parameterization) {
             force_zero_embeddings = true;
         }
         uncond = sd_ctx->sd->cond_stage_model->get_learned_condition(work_ctx,