feat: override text encoders for unet models (leejet#682)

Author: stduhpf

model.cpp

@@ -1539,6 +1539,15 @@ bool ModelLoader::init_from_ckpt_file(const std::string& file_path, const std::s
     return true;
 }
 
+bool ModelLoader::model_is_unet() {
+    for (auto& tensor_storage : tensor_storages) {
+        if (tensor_storage.name.find("model.diffusion_model.input_blocks.") != std::string::npos) {
+            return true;
+        }
+    }
+    return false;
+}
+
 SDVersion ModelLoader::get_sd_version() {
     TensorStorage token_embedding_weight, input_block_weight;
     bool input_block_checked = false;

model.h

@@ -210,6 +210,7 @@ class ModelLoader {
     std::map<std::string, enum ggml_type> tensor_storages_types;
 
     bool init_from_file(const std::string& file_path, const std::string& prefix = "");
+    bool model_is_unet();
     SDVersion get_sd_version();
     ggml_type get_sd_wtype();
     ggml_type get_conditioner_wtype();

stable-diffusion.cpp

@@ -213,16 +213,25 @@ class StableDiffusionGGML {
             }
         }
 
+        if (diffusion_model_path.size() > 0) {
+            LOG_INFO("loading diffusion model from '%s'", diffusion_model_path.c_str());
+            if (!model_loader.init_from_file(diffusion_model_path, "model.diffusion_model.")) {
+                LOG_WARN("loading diffusion model from '%s' failed", diffusion_model_path.c_str());
+            }
+        }
+
+        bool is_unet = model_loader.model_is_unet();
+
         if (clip_l_path.size() > 0) {
             LOG_INFO("loading clip_l from '%s'", clip_l_path.c_str());
-            if (!model_loader.init_from_file(clip_l_path, "text_encoders.clip_l.transformer.")) {
+            if (!model_loader.init_from_file(clip_l_path, is_unet ? "cond_stage_model.transformer." : "text_encoders.clip_l.transformer.")) {
                 LOG_WARN("loading clip_l from '%s' failed", clip_l_path.c_str());
             }
         }
 
         if (clip_g_path.size() > 0) {
             LOG_INFO("loading clip_g from '%s'", clip_g_path.c_str());
-            if (!model_loader.init_from_file(clip_g_path, "text_encoders.clip_g.transformer.")) {
+            if (!model_loader.init_from_file(clip_g_path, is_unet ? "cond_stage_model.1.transformer." : "text_encoders.clip_g.transformer.")) {
                 LOG_WARN("loading clip_g from '%s' failed", clip_g_path.c_str());
             }
         }
@@ -234,13 +243,6 @@ class StableDiffusionGGML {
             }
         }
 
-        if (diffusion_model_path.size() > 0) {
-            LOG_INFO("loading diffusion model from '%s'", diffusion_model_path.c_str());
-            if (!model_loader.init_from_file(diffusion_model_path, "model.diffusion_model.")) {
-                LOG_WARN("loading diffusion model from '%s' failed", diffusion_model_path.c_str());
-            }
-        }
-
         if (vae_path.size() > 0) {
             LOG_INFO("loading vae from '%s'", vae_path.c_str());
             if (!model_loader.init_from_file(vae_path, "vae.")) {