refactor: centralize model factories and defaults (#2198)

src/model/integrations/sd3.cpp

@@ -0,0 +1,40 @@
+#include "conditioning/conditioner.hpp"
+#include "model/diffusion/mmdit.hpp"
+#include "model_definition.h"
+#include "pipeline/model_builders.h"
+
+static bool build_sd3(const sd::model_builders::Context& ctx, const TokenizerConfig& tokenizers, sd::model_builders::CoreRunners& result) {
+    const auto* sd_ctx_params      = &ctx.params;
+    const auto& tensor_storage_map = ctx.tensor_storage_map;
+    const auto version             = ctx.version;
+    const auto& weight_manager     = ctx.weight_manager;
+    result.conditioner             = std::make_shared<SD3CLIPEmbedder>(ctx.backends.runtime_backend(SDBackendModule::TE),
+                                                           tensor_storage_map,
+                                                           weight_manager,
+                                                           tokenizers);
+    result.diffusion               = std::make_shared<MMDiTRunner>(ctx.backends.runtime_backend(SDBackendModule::DIFFUSION),
+                                                     tensor_storage_map,
+                                                     "model.diffusion_model",
+                                                     weight_manager);
+    return true;
+}
+
+const std::vector<ModelDefinition>& sd3_definitions() {
+    static const std::vector<ModelDefinition> definitions = [] {
+        std::vector<ModelDefinition> result;
+        {
+            ModelDefinition definition;
+            definition.version                        = VERSION_SD3;
+            definition.geometry                       = {1, 16, 3};
+            definition.name                           = "SD3.x";
+            definition.traits.is_dit                  = true;
+            definition.sampling                       = {FLOW_PRED, 3.f};
+            definition.sampling.default_sample_method = EULER_SAMPLE_METHOD;
+            definition.sampling.default_scheduler     = DISCRETE_SCHEDULER;
+            definition.build                          = build_sd3;
+            result.push_back(std::move(definition));
+        }
+        return result;
+    }();
+    return definitions;
+}