fix: ernie-image flow shift

see:
- https://huggingface.co/baidu/ERNIE-Image-Turbo/blob/main/scheduler/scheduler_config.json
- https://huggingface.co/baidu/ERNIE-Image/blob/main/scheduler/scheduler_config.json
- https://huggingface.co/baidu/ERNIE-Image/discussions/3

Author: Green-Sky

flake.lock

@@ -0,0 +1,90 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        name = "stable-diffusion.cpp";
+        src = ./.;
+        meta.mainProgram = "sd";
+        stdenv = (pkgs.stdenvAdapters.keepDebugInfo pkgs.stdenv);
+        inherit (pkgs.stdenv) isAarch32 isAarch64 isDarwin;
+        buildInputs = with pkgs; [ boost ];
+        osSpecific = with pkgs; buildInputs ++ (
+          if isAarch64 && isDarwin then
+            with pkgs.darwin.apple_sdk_11_0.frameworks; [
+              Accelerate
+              MetalKit
+            ]
+          else if isAarch32 && isDarwin then
+            with pkgs.darwin.apple_sdk.frameworks; [
+              Accelerate
+              CoreGraphics
+              CoreVideo
+            ]
+          else if isDarwin then
+            with pkgs.darwin.apple_sdk.frameworks; [
+              Accelerate
+              CoreGraphics
+              CoreVideo
+            ]
+          else
+            with pkgs; [ openblas ]
+        );
+        pkgs = import nixpkgs { inherit system; };
+        nativeBuildInputs = with pkgs; [ cmake ninja pkg-config git ];
+        cmakeFlags = [
+          "-DCMAKE_BUILD_TYPE=RelWithDebInfo"
+          #"-DCMAKE_BUILD_TYPE=Debug"
+          #"-DCMAKE_C_FLAGS:STRING=-Og"
+          #"-DCMAKE_CXX_FLAGS:STRING=-Og"
+          #"-DCMAKE_C_FLAGS:STRING=-fsanitize=address,undefined"
+          #"-DCMAKE_CXX_FLAGS:STRING=-fsanitize=address,undefined"
+          #"-DCMAKE_EXE_LINKER_FLAGS:STRING=-fsanitize=address,undefined"
+
+
+          # does not work
+          "-DGGML_NATIVE=OFF"
+          "-DGGML_AVX=ON"
+          "-DGGML_AVX2=ON"
+          "-DGGML_FMA=ON"
+          "-DGGML_F16C=ON"
+
+          #"-DBUILD_SHARED_LIBS=ON"
+          "-DCMAKE_SKIP_BUILD_RPATH=ON"
+        ];
+      in
+      {
+        packages.default = stdenv.mkDerivation {
+          inherit name src meta nativeBuildInputs;
+          buildInputs = osSpecific;
+        };
+        packages.cuda = stdenv.mkDerivation {
+          inherit name src meta;
+          buildInputs = with pkgs; buildInputs ++ [
+            #cudaPackages.cudatoolkit
+            cudaPackages.cuda_cccl # <nv/target>
+
+            # A temporary hack for reducing the closure size, remove once cudaPackages
+            # have stopped using lndir: https://github.com/NixOS/nixpkgs/issues/271792
+            cudaPackages.cuda_cudart
+            cudaPackages.libcublas
+          ];
+          nativeBuildInputs = with pkgs; nativeBuildInputs ++ [
+            cudaPackages.cuda_nvcc
+            autoAddDriverRunpath
+          ];
+          cmakeFlags = cmakeFlags ++ [
+            "-DSD_CUDA=ON"
+            "-DCMAKE_CUDA_ARCHITECTURES=75"
+          ];
+        };
+        apps.sd = {
+          type = "app";
+          program = "${self.packages.${system}.default}/bin/sd";
+        };
+        apps.default = self.apps.${system}.sd;
+      });
+}

flake.nix

@@ -943,6 +943,8 @@ class StableDiffusionGGML {
                     pred_type = FLOW_PRED;
                     if (sd_version_is_wan(version)) {
                         default_flow_shift = 5.f;
+                    } else if (sd_version_is_ernie_image(version)) {
+                        default_flow_shift = 4.f;
                     } else {
                         default_flow_shift = 3.f;
                     }