feat(depth): metric-large + nested metric model gallery entries (#10363)

* feat(depth): add depth-anything-3-metric-large gallery entry

DA3METRIC-LARGE (ViT-L) single-file metric-scale depth + sky, served by the
existing depth-anything backend (same single-GGUF path as mono-large). GGUF
published at mudler/depth-anything.cpp-gguf.

Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* feat(depth): serve nested metric model (two-file load)

The DA3 nested model needs both branches (anyview GIANT + metric ViT-L) loaded
together. Wire it through the backend:
- Load reads a 'metric_model:<file>' entry from ModelOptions.Options and, when
  present, calls da_capi_load_nested(anyview, metric) instead of da_capi_load
  (registers the new abi-4 symbol; helper optionValue + unit test).
- gallery: depth-anything-3-nested (model=anyview, options=metric branch, both
  GGUFs fetched) for metric-scale depth + pose.
- bump depth-anything.cpp pin to cce5edc (abi 4 / da_capi_load_nested).

Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

---------

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Co-authored-by: Ettore Di Giacinto <mudler@localai.io>

backend/go/depth-anything-cpp/Makefile

@@ -8,9 +8,11 @@ JOBS?=$(shell nproc --ignore=1)
 
 # depth-anything.cpp. Pin to a specific commit for a stable build; a squash
 # merge upstream can orphan a branch, so the native version is pinned by SHA.
-# The SHA is kept alive by the v0.1.2 tag on the upstream repo.
+# This SHA adds the nested two-file metric C-API (abi_version 4,
+# da_capi_load_nested) required by the depth-anything-3-nested gallery model;
+# tag it (e.g. v0.1.3) upstream to keep the SHA alive.
 DEPTHANYTHING_REPO?=https://github.com/mudler/depth-anything.cpp.git
-DEPTHANYTHING_VERSION?=442eea4f73e83ca9d9bc8e026b966cffa678ffc4
+DEPTHANYTHING_VERSION?=cce5edc395fd1843806093d7ccc0c8b0d0b97b72
 
 ifeq ($(NATIVE),false)
 	CMAKE_ARGS+=-DGGML_NATIVE=OFF

backend/go/depth-anything-cpp/godepthanythingcpp.go

@@ -24,6 +24,7 @@ import (
 	"math"
 	"os"
 	"path/filepath"
+	"strings"
 	"unsafe"
 
 	"github.com/mudler/LocalAI/pkg/grpc/base"
@@ -36,6 +37,10 @@ import (
 var (
 	// da_capi_load(const char* gguf_path, int n_threads) -> da_ctx* (0 = fail)
 	CapiLoad func(gguf string, nThreads int32) uintptr
+	// da_capi_load_nested(const char* anyview_gguf, const char* metric_gguf,
+	//   int n_threads) -> da_ctx* (0 = fail). The returned ctx serves the nested
+	//   metric model: depth/pose calls produce final metric-scale depth + scaled pose.
+	CapiLoadNested func(anyview string, metric string, nThreads int32) uintptr
 	// da_capi_free(da_ctx* ctx) — safe on a 0 handle.
 	CapiFree func(handle uintptr)
 	// da_capi_last_error(da_ctx* ctx) -> const char* (owned by ctx, "" if none).
@@ -87,17 +92,24 @@ func (r *DepthAnythingCpp) Load(opts *pb.ModelOptions) error {
 		return fmt.Errorf("depth-anything-cpp: ModelFile is empty")
 	}
 
-	var modelPath string
-	if filepath.IsAbs(modelFile) {
-		modelPath = modelFile
-	} else {
-		modelPath = filepath.Join(opts.ModelPath, modelFile)
+	resolve := func(name string) string {
+		if filepath.IsAbs(name) {
+			return name
+		}
+		return filepath.Join(opts.ModelPath, name)
 	}
+	modelPath := resolve(modelFile)
 
 	if _, err := os.Stat(modelPath); err != nil {
 		return fmt.Errorf("depth-anything-cpp: model file not found: %s: %w", modelPath, err)
 	}
 
+	// Nested metric models are a two-file pair: the main model is the anyview
+	// (GIANT) branch and the metric (ViT-L + DPT/sky) branch is named via a
+	// "metric_model:<filename>" entry in opts.Options. When present we load both
+	// branches so the engine runs the nested metric alignment.
+	metricFile := optionValue(opts.Options, "metric_model")
+
 	threads := opts.Threads
 	if threads <= 0 {
 		threads = 4
@@ -109,19 +121,47 @@ func (r *DepthAnythingCpp) Load(opts *pb.ModelOptions) error {
 		r.handle = 0
 	}
 
-	h := CapiLoad(modelPath, threads)
-	if h == 0 {
-		// da_capi_last_error needs a ctx; on a failed load we have none (it
-		// returns "" for a null ctx), so the text is best-effort.
-		if msg := CapiLastError(0); msg != "" {
-			return fmt.Errorf("depth-anything-cpp: da_capi_load failed for %s: %s", modelPath, msg)
+	var h uintptr
+	if metricFile != "" {
+		metricPath := resolve(metricFile)
+		if _, err := os.Stat(metricPath); err != nil {
+			return fmt.Errorf("depth-anything-cpp: metric_model file not found: %s: %w", metricPath, err)
+		}
+		h = CapiLoadNested(modelPath, metricPath, threads)
+		if h == 0 {
+			if msg := CapiLastError(0); msg != "" {
+				return fmt.Errorf("depth-anything-cpp: da_capi_load_nested failed for %s + %s: %s", modelPath, metricPath, msg)
+			}
+			return fmt.Errorf("depth-anything-cpp: da_capi_load_nested failed for %s + %s", modelPath, metricPath)
+		}
+	} else {
+		h = CapiLoad(modelPath, threads)
+		if h == 0 {
+			// da_capi_last_error needs a ctx; on a failed load we have none (it
+			// returns "" for a null ctx), so the text is best-effort.
+			if msg := CapiLastError(0); msg != "" {
+				return fmt.Errorf("depth-anything-cpp: da_capi_load failed for %s: %s", modelPath, msg)
+			}
+			return fmt.Errorf("depth-anything-cpp: da_capi_load failed for %s", modelPath)
 		}
-		return fmt.Errorf("depth-anything-cpp: da_capi_load failed for %s", modelPath)
 	}
 	r.handle = h
 	return nil
 }
 
+// optionValue returns the value of the first "key:value" entry in opts whose key
+// matches (case-sensitive), or "" if absent. Mirrors how other LocalAI backends
+// read ModelOptions.Options.
+func optionValue(opts []string, key string) string {
+	prefix := key + ":"
+	for _, o := range opts {
+		if strings.HasPrefix(o, prefix) {
+			return strings.TrimSpace(o[len(prefix):])
+		}
+	}
+	return ""
+}
+
 // depthResult is the JSON payload returned by Predict.
 type depthResult struct {
 	DepthW     int         `json:"depth_w"`
@@ -373,6 +413,10 @@ func copyBytes(p *byte, n int) []byte {
 // runDepthPose runs depth estimation then pose recovery on an image file. It
 // returns the row-major depth map (length h*w), its dimensions, the 3x4
 // extrinsics (12 floats) and 3x3 intrinsics (9 floats).
+// runDepthPose returns depth + camera pose via two C-API calls (depth then pose).
+// For a nested metric model both calls run the full two-branch pipeline, so this
+// path infers twice; the typed Depth RPC (single da_capi_depth_dense call) is the
+// efficient path for nested models.
 func (r *DepthAnythingCpp) runDepthPose(imagePath string) (depth []float32, h, w int, ext [12]float32, intr [9]float32, err error) {
 	if r.handle == 0 {
 		err = fmt.Errorf("depth-anything-cpp: model not loaded")

backend/go/depth-anything-cpp/main.go

@@ -37,6 +37,7 @@ func main() {
 
 	libFuncs := []LibFuncs{
 		{&CapiLoad, "da_capi_load"},
+		{&CapiLoadNested, "da_capi_load_nested"},
 		{&CapiFree, "da_capi_free"},
 		{&CapiLastError, "da_capi_last_error"},
 		{&CapiDepthPath, "da_capi_depth_path"},

backend/go/depth-anything-cpp/nested_e2e_test.go

@@ -0,0 +1,64 @@
+package main
+
+// nested_e2e_test.go - e2e smoke for the nested two-file metric model. Loads the
+// anyview branch as the main model and points the metric branch via the
+// "metric_model:<file>" option (exactly as the depth-anything-3-nested gallery
+// entry does), then exercises the typed Depth RPC and asserts a metric depth map.
+//
+// Skips cleanly unless both nested GGUFs are present under ./test-models/ and the
+// backend binary + fallback .so are built.
+
+import (
+	"context"
+	"fmt"
+	"path/filepath"
+	"time"
+
+	pb "github.com/mudler/LocalAI/pkg/grpc/proto"
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("depth-anything-cpp nested metric model", func() {
+	It("loads the two-file pair via the metric_model option and returns metric depth", func() {
+		anyviewPath := modelPathOrSkip("depth-anything-nested-anyview.gguf")
+		_ = modelPathOrSkip("depth-anything-nested-metric.gguf")
+		imgB64 := loadTestImage()
+
+		port := freePort()
+		cleanup := startBackend(port)
+		defer cleanup()
+
+		client, closeConn := dialBackend(port)
+		defer closeConn()
+
+		ctx, cancel := context.WithTimeout(context.Background(), 25*time.Minute)
+		defer cancel()
+
+		loadResp, err := client.LoadModel(ctx, &pb.ModelOptions{
+			Model:     "depth-anything-nested-anyview.gguf",
+			ModelFile: anyviewPath,
+			ModelPath: filepath.Dir(anyviewPath),
+			Options:   []string{"metric_model:depth-anything-nested-metric.gguf"},
+			Threads:   8,
+		})
+		Expect(err).ToNot(HaveOccurred(), "LoadModel(nested)")
+		Expect(loadResp.GetSuccess()).To(BeTrue(), "LoadModel reported failure: %s", loadResp.GetMessage())
+
+		resp, err := client.Depth(ctx, &pb.DepthRequest{
+			Src:          imgB64,
+			IncludeDepth: true,
+			IncludePose:  true,
+		})
+		Expect(err).ToNot(HaveOccurred(), "Depth(nested)")
+		Expect(resp.GetWidth()).To(BeNumerically(">", 0), "depth width")
+		Expect(resp.GetHeight()).To(BeNumerically(">", 0), "depth height")
+		Expect(resp.GetIsMetric()).To(BeTrue(), "nested output must be metric")
+		Expect(len(resp.GetDepth())).To(Equal(int(resp.GetWidth())*int(resp.GetHeight())), "dense depth length")
+		Expect(len(resp.GetExtrinsics())).To(Equal(12), "extrinsics 3x4")
+		Expect(resp.GetIntrinsics()[0]).To(BeNumerically(">", 0), "fx > 0")
+
+		_, _ = fmt.Fprintf(GinkgoWriter, "nested depth OK: %dx%d is_metric=%v fx=%.2f\n",
+			resp.GetWidth(), resp.GetHeight(), resp.GetIsMetric(), resp.GetIntrinsics()[0])
+	})
+})

backend/go/depth-anything-cpp/options_test.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+var _ = DescribeTable("optionValue",
+	func(opts []string, key, want string) {
+		Expect(optionValue(opts, key)).To(Equal(want))
+	},
+	Entry("present", []string{"foo:bar", "metric_model:m.gguf"}, "metric_model", "m.gguf"),
+	Entry("absent", []string{"foo:bar"}, "metric_model", ""),
+	Entry("nil", []string(nil), "metric_model", ""),
+	Entry("trims space", []string{"metric_model:  m.gguf  "}, "metric_model", "m.gguf"),
+	Entry("value with colon", []string{"metric_model:a:b.gguf"}, "metric_model", "a:b.gguf"),
+	Entry("first wins", []string{"metric_model:first.gguf", "metric_model:second.gguf"}, "metric_model", "first.gguf"),
+	Entry("empty value", []string{"metric_model:"}, "metric_model", ""),
+	Entry("prefix not key", []string{"metric_model_extra:x"}, "metric_model", ""),
+)

gallery/index.yaml

@@ -8162,6 +8162,54 @@
     - filename: depth-anything-mono-large-f32.gguf
       uri: huggingface://mudler/depth-anything.cpp-gguf/depth-anything-mono-large-f32.gguf
       sha256: "291b1a554af907c3f79986ee225da8933be5f7a31d73c81d06784cda284535de"
+
+- !!merge <<: *depth-anything-3-base
+  name: depth-anything-3-metric-large
+  description: |
+    Depth Anything 3 (metric large / vitl), f32 (~1.3 GB) — single-image
+    metric-scale depth (meters) + a sky mask. DPT single-head metric variant; use
+    GenerateImage (src -> normalized depth PNG) or Predict (JSON metric depth
+    stats, is_metric=true).
+  overrides:
+    backend: depth-anything
+    parameters:
+      model: depth-anything-metric-large-f32.gguf
+  files:
+    - filename: depth-anything-metric-large-f32.gguf
+      uri: huggingface://mudler/depth-anything.cpp-gguf/depth-anything-metric-large-f32.gguf
+      sha256: "d10b7450c2238244b2d72e2749537a1876255180149cd630a18bc1619c9286be"
+
+- !!merge <<: *depth-anything-3-base
+  name: depth-anything-3-nested
+  description: |
+    Depth Anything 3 (nested giant+large), f32 — the recommended metric model. A
+    two-branch pipeline: the anyview GIANT (vitg) branch and a metric ViT-L branch
+    are run and aligned to recover true metric-scale depth (meters) + scaled camera
+    pose from a single image. Downloads both branches (~6 GB total); GPU strongly
+    recommended. Predict returns metric depth stats + pose (is_metric=true).
+  tags:
+    - depth-estimation
+    - camera-pose
+    - metric-depth
+    - depth-anything
+    - native
+    - cpp
+    - gpu
+  overrides:
+    backend: depth-anything
+    # The metric (ViT-L) branch is loaded alongside the anyview model via the
+    # metric_model option; both files are fetched below.
+    options:
+      - "metric_model:depth-anything-nested-metric.gguf"
+    parameters:
+      model: depth-anything-nested-anyview.gguf
+  files:
+    - filename: depth-anything-nested-anyview.gguf
+      uri: huggingface://mudler/depth-anything.cpp-gguf/depth-anything-nested-anyview.gguf
+      sha256: "2a4cb4382aa8c4159fff10dfffa121f3c7a574551c4ff4ad130f235d5442f9ce"
+    - filename: depth-anything-nested-metric.gguf
+      uri: huggingface://mudler/depth-anything.cpp-gguf/depth-anything-nested-metric.gguf
+      sha256: "b54ed50cbc0b0c14fae1f8edd0fea8bd1cac0850485fd6e7eb2422c7a19e570e"
 - name: rfdetr-cpp-base
   url: github:mudler/LocalAI/gallery/virtual.yaml@master
   urls: