mglambda
diff --git a/‎examples/llava/README.md‎
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diff --git a/‎examples/llava/clip.cpp‎
Lines changed: 89 additions & 19 deletions b/‎examples/llava/clip.cpp‎
Lines changed: 89 additions & 19 deletions
diff --git a/‎examples/llava/clip.h‎
Lines changed: 4 additions & 1 deletion b/‎examples/llava/clip.h‎
Lines changed: 4 additions & 1 deletion
@@ -101,8 +101,27 @@ python ./examples/convert_legacy_llama.py ../llava-v1.6-vicuna-7b/ --skip-unknow
 ```
 
 **note** llava-1.6 needs more context than llava-1.5, at least 3000 is needed (just run it at -c 4096)
+
 **note** llava-1.6 greatly benefits from batched prompt processing (defaults work)
 
+**note** if the language model in step `6)` is incompatible with the legacy conversion script, the easiest way handle the LLM model conversion is to load the model in transformers, and export only the LLM from the llava next model.
+
+```python
+import os
+import transformers
+
+model_path = ...
+llm_export_path = ...
+
+tokenizer = transformers.AutoTokenizer.from_pretrained(model_path)
+model = transformers.AutoModelForImageTextToText.from_pretrained(model_path)
+
+tokenizer.save_pretrained(llm_export_path)
+model.language_model.save_pretrained(llm_export_path)
+```
+
+Then, you can convert the LLM using the `convert_hf_to_gguf.py` script, which handles more LLM architectures.
+
 ## llava-cli templating and llava-1.6 prompting
 
 llava-1.5 models all use the same vicuna prompt, here you can just add your image question like `-p "Provide a full description."`
 
@@ -40,6 +40,7 @@
 #include <map>
 #include <regex>
 #include <stdexcept>
+#include <unordered_set>
 #include <vector>
 #include <sstream>
 #include <cinttypes>
@@ -120,6 +121,7 @@ static std::string format(const char * fmt, ...) {
 #define KEY_IMAGE_MEAN          "clip.vision.image_mean"
 #define KEY_IMAGE_STD           "clip.vision.image_std"
 #define KEY_PROJ_TYPE           "clip.projector_type"
+#define KEY_FEATURE_LAYER       "clip.vision.feature_layer"
 
 #define KEY_MM_PATCH_MERGE_TYPE   "clip.vision.mm_patch_merge_type"
 #define KEY_IMAGE_GRID_PINPOINTS  "clip.vision.image_grid_pinpoints"
@@ -444,8 +446,9 @@ struct clip_hparams {
 
     char mm_patch_merge_type[32] = "flat"; // spatial_unpad or flat (default)
 
-    int32_t image_grid_pinpoints[32];
+    std::vector<int32_t> image_grid_pinpoints;
     int32_t image_crop_resolution;
+    std::unordered_set<int32_t> vision_feature_layer;
 };
 
 struct clip_layer {
@@ -585,6 +588,7 @@ struct clip_ctx {
     struct clip_vision_model vision_model;
     projector_type proj_type = PROJECTOR_TYPE_MLP;
 
+    int32_t max_feature_layer;
     float image_mean[3];
     float image_std[3];
     bool use_gelu = false;
@@ -651,7 +655,6 @@ static ggml_cgraph * clip_image_build_graph(clip_ctx * ctx, const clip_image_f32
     const int hidden_size          = hparams.hidden_size;
     const int n_head               = hparams.n_head;
     const int d_head               = hidden_size / n_head;
-    int n_layer                    = hparams.n_layer;
     const float eps                = hparams.eps;
     int mrope_sections[4] = {d_head/4, d_head/4, d_head/4, d_head/4};
 
@@ -752,13 +755,19 @@ static ggml_cgraph * clip_image_build_graph(clip_ctx * ctx, const clip_image_f32
         embeddings = ggml_add(ctx0, ggml_mul(ctx0, embeddings, model.pre_ln_w), model.pre_ln_b);
     }
 
+    std::vector<struct ggml_tensor *> embedding_stack;
+    const auto & vision_feature_layer = hparams.vision_feature_layer;
+
     // loop over layers
-    if (ctx->has_minicpmv_projector || ctx->has_glm_projector || ctx->has_qwen2vl_merger) {
-        n_layer += 1;
-    }
-    for (int il = 0; il < n_layer - 1; il++) {
+    for (int il = 0; il < ctx->max_feature_layer; il++) {
         struct ggml_tensor * cur = embeddings; // embeddings = residual, cur = hidden_states
 
+        // If this is an embedding feature layer, save the output.
+        // NOTE: 0 index here refers to the input to the encoder.
+        if (vision_feature_layer.find(il) != vision_feature_layer.end()) {
+            embedding_stack.push_back(embeddings);
+        }
+
         //const size_t nb_q_w = model.layers[il].q_w->nb[0];
 
         // layernorm1
@@ -846,7 +855,6 @@ static ggml_cgraph * clip_image_build_graph(clip_ctx * ctx, const clip_image_f32
         cur = ggml_add(ctx0, embeddings, cur);
 
         embeddings = cur;
-
     }
 
     // post-layernorm
@@ -857,6 +865,19 @@ static ggml_cgraph * clip_image_build_graph(clip_ctx * ctx, const clip_image_f32
         embeddings = ggml_add(ctx0, ggml_mul(ctx0, embeddings, model.post_ln_w), model.post_ln_b);
     }
 
+    // final layer is a vision feature layer
+    if (vision_feature_layer.find(ctx->max_feature_layer) != vision_feature_layer.end()) {
+        embedding_stack.push_back(embeddings);
+    }
+
+    // If feature layers are explicitly set, stack them (if we have multiple)
+    if (!embedding_stack.empty()) {
+        embeddings = embedding_stack[0];
+        for (size_t i = 1; i < embedding_stack.size(); i++) {
+            embeddings = ggml_concat(ctx0, embeddings, embedding_stack[i], 0);
+        }
+    }
+
     // llava projector
     if (ctx->has_llava_projector) {
         embeddings = ggml_reshape_2d(ctx0, embeddings, embeddings->ne[0], embeddings->ne[1]);
@@ -1443,14 +1464,26 @@ struct clip_ctx * clip_model_load(const char * fname, const int verbosity = 1) {
             int idx = get_key_idx(ctx, KEY_IMAGE_GRID_PINPOINTS);
             int n = gguf_get_arr_n(ctx, idx);
             const int32_t * pinpoints = (const int32_t *)gguf_get_arr_data(ctx, idx);
-            for (int i = 0; i < 32 && i < n && pinpoints[i] != 0; ++i) {
-                hparams.image_grid_pinpoints[i] = pinpoints[i];
+            for (int i = 0; i < n; ++i) {
+                hparams.image_grid_pinpoints.push_back(pinpoints[i]);
             }
-            if (n < 32)
-                hparams.image_grid_pinpoints[n] = 0;
-        } catch (std::runtime_error & /*e*/) {
-            hparams.image_grid_pinpoints[0]=0;
-        }
+        } catch (std::runtime_error & /*e*/) { }
+
+        // Load the vision feature layer indices if they are explicitly provided;
+        // if multiple vision feature layers are present, the values will be concatenated
+        // to form the final visual features.
+        // NOTE: gguf conversions should standardize the values of the vision feature layer to
+        // be non-negative, since we use -1 to mark values as unset here.
+        try {
+            int idx = get_key_idx(ctx, KEY_FEATURE_LAYER);
+            int n = gguf_get_arr_n(ctx, idx);
+
+            const int32_t * vision_feature_layer = (const int32_t *)gguf_get_arr_data(ctx, idx);
+
+            for (int i = 0; i < n; ++i) {
+                hparams.vision_feature_layer.insert(vision_feature_layer[i]);
+            }
+        } catch (std::runtime_error & /*e*/) { }
 
         try {
             int idx = get_key_idx(ctx, KEY_MM_PATCH_MERGE_TYPE);
@@ -1476,6 +1509,9 @@ struct clip_ctx * clip_model_load(const char * fname, const int verbosity = 1) {
             new_clip->image_std[i]  = std_data[i];
         }
 
+        // Calculate the deepest feature layer based on hparams and projector type
+        new_clip->max_feature_layer = get_deepest_feature_layer(new_clip);
+
         if (verbosity >= 2) {
             LOG_INF("\n%s: vision model hparams\n", __func__);
             LOG_INF("image_size         %d\n", hparams.image_size);
@@ -1489,8 +1525,13 @@ struct clip_ctx * clip_model_load(const char * fname, const int verbosity = 1) {
             LOG_INF("v_image_mean       %f %f %f\n", new_clip->image_mean[0], new_clip->image_mean[1], new_clip->image_mean[2]);
             LOG_INF("v_image_std        %f %f %f\n", new_clip->image_std[0], new_clip->image_std[1], new_clip->image_std[2]);
             LOG_INF("v_image_grid_pinpoints: ");
-            for (int i = 0; i < 32 && (hparams.image_grid_pinpoints[i] != 0); ++i) {
-                LOG_INF("%d ", hparams.image_grid_pinpoints[i]);
+            for (const auto & pp : hparams.image_grid_pinpoints) {
+                LOG_INF("%d ", pp);
+            }
+            LOG_INF("\n");
+            LOG_INF("v_vision_feature_layer: ");
+            for (const auto & feature_layer: hparams.vision_feature_layer) {
+                LOG_INF("%d ", feature_layer);
             }
             LOG_INF("\n");
             LOG_INF("v_mm_patch_merge_type: %s\n", hparams.mm_patch_merge_type);
@@ -2235,10 +2276,10 @@ bool clip_image_preprocess(struct clip_ctx * ctx, const clip_image_u8 * img, cli
             }
         }
     } else {
-        if (params.image_grid_pinpoints[0] != 0) {
+        if (!params.image_grid_pinpoints.empty()) {
             // "spatial_unpad" with "anyres" processing for llava-1.6
             std::vector<std::pair<int, int>> possible_resolutions;
-            for (int i = 0; i < 32 && params.image_grid_pinpoints[i] != 0; i+=2) {
+            for (size_t i = 0; i < params.image_grid_pinpoints.size(); i+=2) {
                 possible_resolutions.push_back({params.image_grid_pinpoints[i], params.image_grid_pinpoints[i+1]});
             }
             std::pair<int, int> best_resolution = select_best_resolution({img->nx, img->ny}, possible_resolutions);
@@ -2404,7 +2445,14 @@ const char * clip_patch_merge_type(const struct clip_ctx * ctx) {
 }
 
 const int32_t * clip_image_grid(const struct clip_ctx * ctx) {
-    return ctx->vision_model.hparams.image_grid_pinpoints;
+    if (ctx->vision_model.hparams.image_grid_pinpoints.size()) {
+        return &ctx->vision_model.hparams.image_grid_pinpoints.front();
+    }
+    return nullptr;
+}
+
+size_t get_clip_image_grid_size(const struct clip_ctx * ctx) {
+    return ctx->vision_model.hparams.image_grid_pinpoints.size();
 }
 
 int clip_n_patches(const struct clip_ctx * ctx) {
@@ -2929,6 +2977,28 @@ bool clip_is_qwen2vl(const struct clip_ctx * ctx) {
     return ctx->has_qwen2vl_merger;
 }
 
+// Determine the number of encoder layers to iterate over
+int get_deepest_feature_layer(const struct clip_ctx * ctx) {
+    // Get the index of the second to last layer; this is the
+    // default for models that have a llava projector
+    const auto & hparams = ctx->vision_model.hparams;
+    int n_layer = hparams.n_layer - 1;
+    int deepest_feature_layer = -1;
+
+    // Handle other projectors; incrementing here indicates that we
+    // should use the last encoder layer for the vision features.
+    if (ctx->has_minicpmv_projector || ctx->has_glm_projector || ctx->has_qwen2vl_merger) {
+        n_layer += 1;
+    }
+
+    // If we set explicit vision feature layers, only go up to the deepest one
+    for (const auto & feature_layer : hparams.vision_feature_layer) {
+        if (feature_layer > deepest_feature_layer) {
+            deepest_feature_layer = feature_layer;
+        }
+    }
+    return deepest_feature_layer < 0 ? n_layer : deepest_feature_layer;
+}
 
 bool clip_encode_float_image (struct clip_ctx * ctx, int n_threads, float * img, int h, int w, float * vec) {
     clip_image_f32 clip_img;
 
@@ -55,6 +55,7 @@ CLIP_API int32_t clip_hidden_size(const struct clip_ctx * ctx);
 CLIP_API const char * clip_patch_merge_type(const struct clip_ctx * ctx);
 
 CLIP_API const int32_t * clip_image_grid(const struct clip_ctx * ctx);
+CLIP_API size_t get_clip_image_grid_size(const struct clip_ctx * ctx);
 
 CLIP_API int clip_n_patches        (const struct clip_ctx * ctx);
 CLIP_API int clip_n_patches_by_img (const struct clip_ctx * ctx, struct clip_image_f32 * img);
@@ -92,11 +93,13 @@ CLIP_API bool clip_image_batch_encode(struct clip_ctx * ctx, int n_threads, cons
 CLIP_API bool clip_model_quantize(const char * fname_inp, const char * fname_out, int itype);
 
 CLIP_API int clip_is_minicpmv(const struct clip_ctx * ctx);
+CLIP_API bool clip_is_glm(const struct clip_ctx * ctx);
 CLIP_API bool clip_is_qwen2vl(const struct clip_ctx * ctx);
 
+CLIP_API int get_deepest_feature_layer(const struct clip_ctx * ctx);
+
 CLIP_API bool clip_encode_float_image (struct clip_ctx * ctx, int n_threads, float * img, int h, int w, float * vec);
 
-CLIP_API bool clip_is_glm(const struct clip_ctx * ctx);
 
 #ifdef __cplusplus
 }