debug : include LLAMA_POOLING_TYPE_UNSPECIFIED in pooling check (#18692)

* debug : include LLAMA_POOLING_TYPE_UNSPECIFIED in pooling check

This commit updates the pooling check in the debug example to
also include LLAMA_POOLING_TYPE_UNSPECIFIED and not just
LLAMA_POOLING_TYPE_NONE.

* debug : normalize both pooled and token embeddings

This commit updates debug.cpp to normalize embeddings for both pooled
and non-pooled outputs. For pooled embeddings, normalization is applied
to the single vector, and for non-pooled embeddings, normalization is
applied to each token embedding vector individually.

The motivation for this is to enable non-pooled embeddings to be
normalized which was not possible previously.

examples/debug/debug.cpp

@@ -57,11 +57,21 @@ struct callback_data {
     }
 };
 
+static bool has_pooling(llama_context * ctx) {
+    switch (llama_pooling_type(ctx)) {
+        case LLAMA_POOLING_TYPE_NONE:
+        case LLAMA_POOLING_TYPE_UNSPECIFIED:
+            return false;
+        default:
+            return true;
+    }
+}
+
 struct output_data {
     float *                  data_ptr    = nullptr;
     int                      data_size   = 0;
     std::string              type_suffix;
-    std::vector<float>       storage;
+    std::vector<float>       embd_norm;
     std::string              prompt;
     std::vector<llama_token> tokens;
 
@@ -73,24 +83,32 @@ struct output_data {
         prompt = params.prompt;
 
         if (params.embedding) {
-            const int  n_embd          = llama_model_n_embd_out(model);
-            const bool pooling_enabled = llama_pooling_type(ctx) != LLAMA_POOLING_TYPE_NONE;
-            const int  n_embd_count    = pooling_enabled ? 1 : tokens.size();
-            const int  n_embeddings    = n_embd * n_embd_count;
-
-            float * embeddings;
-            if (pooling_enabled) {
-                embeddings = llama_get_embeddings_seq(ctx, 0);
-                storage.resize(n_embeddings);
-                common_embd_normalize(embeddings, storage.data(), n_embeddings, params.embd_normalize);
-                embeddings = storage.data();
-            } else {
-                embeddings = llama_get_embeddings(ctx);
+            const int n_embd       = llama_model_n_embd_out(model);
+            const bool pooling     = has_pooling(ctx);
+            const int n_embd_count = pooling ? 1 : tokens.size();
+            const int n_floats     = n_embd * n_embd_count;
+
+            float * embd_raw = pooling ? llama_get_embeddings_seq(ctx, 0) : llama_get_embeddings(ctx);
+            if (embd_raw == nullptr) {
+                throw std::runtime_error("failed to get embeddings from the model");
             }
 
-            data_ptr = embeddings;
-            data_size = n_embeddings;
+            LOG_DBG("pooling_enabled: %s\n", pooling ? "true" : "false");
+            LOG_DBG("n_embd: %d\n", n_embd);
+            LOG_DBG("n_floats: %d\n", n_floats);
+            LOG_DBG("n_embd_count: %d\n", n_embd_count);
+
+            data_ptr    = embd_raw;
+            data_size   = n_floats;
             type_suffix = "-embeddings";
+
+            if (params.embd_normalize >= 0) {
+                embd_norm.resize(n_floats);
+                for (int i = 0; i < n_embd_count; i++) {
+                    common_embd_normalize(embd_raw+i*n_embd, embd_norm.data()+i*n_embd, n_embd, params.embd_normalize);
+                }
+                data_ptr = embd_norm.data();
+            }
         } else {
             const float * logits = llama_get_logits_ith(ctx, tokens.size() - 1);
             const int n_logits = llama_vocab_n_tokens(vocab);