llama : fix embeddings

ggml-ci

examples/embedding/embedding.cpp

@@ -19,7 +19,7 @@ static std::vector<std::string> split_lines(const std::string & s) {
 
 static void batch_add_seq(llama_batch & batch, const std::vector<int32_t> & tokens, int seq_id) {
     for (size_t i = 0; i < tokens.size(); i++) {
-        llama_batch_add(batch, tokens[i], i, { seq_id }, false);
+        llama_batch_add(batch, tokens[i], i, { seq_id }, i == tokens.size() - 1);
     }
 }
 
@@ -45,9 +45,13 @@ static void batch_decode(llama_context * ctx, llama_batch & batch, float * outpu
     }
 
     // normalize on copy
-    for (int k = 0; k < n_seq; k++) {
-        float * emb = llama_get_embeddings_ith(ctx, k);
-        float * out = output + k * n_embd;
+    for (int i = 0; i < batch.n_tokens; i++) {
+        if (!batch.logits[i]) {
+            continue;
+        }
+
+        float * emb = llama_get_embeddings_ith(ctx, i);
+        float * out = output + batch.seq_id[i][0] * n_embd;
         normalize(emb, out, n_embd);
     }
 }
@@ -145,6 +149,7 @@ int main(int argc, char ** argv) {
     for (int k = 0; k < n_prompts; k++) {
         // clamp to n_batch tokens
         auto & inp = inputs[k];
+
         const uint64_t n_toks = inp.size();
 
         // encode if at capacity

examples/server-embd.py

@@ -0,0 +1,34 @@
+import asyncio
+import requests
+import numpy as np
+
+n = 8
+
+result = []
+
+async def requests_post_async(*args, **kwargs):
+    return await asyncio.to_thread(requests.post, *args, **kwargs)
+
+async def main():
+    model_url = "http://127.0.0.1:6900"
+    responses: list[requests.Response] = await asyncio.gather(*[requests_post_async(
+        url= f"{model_url}/embedding",
+        json= {"content": str(i)*32}
+    ) for i in range(n)])
+
+    for response in responses:
+        embedding = response.json()["embedding"]
+        print(embedding[-8:])
+        result.append(embedding)
+
+asyncio.run(main())
+
+# compute cosine similarity
+
+for i in range(n-1):
+    for j in range(i+1, n):
+        embedding1 = np.array(result[i])
+        embedding2 = np.array(result[j])
+        similarity = np.dot(embedding1, embedding2) / (np.linalg.norm(embedding1) * np.linalg.norm(embedding2))
+        print(f"Similarity between {i} and {j}: {similarity:.2f}")
+

examples/server/server.cpp

@@ -1210,7 +1210,7 @@ struct llama_server_context
         queue_results.send(res);
     }
 
-    void send_embedding(server_slot &slot)
+    void send_embedding(server_slot & slot, const llama_batch & batch)
     {
         task_result res;
         res.id = slot.task_id;
@@ -1219,6 +1219,7 @@ struct llama_server_context
         res.stop = true;
 
         const int n_embd = llama_n_embd(model);
+
         if (!params.embedding)
         {
             LOG_WARNING("embedding disabled", {{"params.embedding", params.embedding}});
@@ -1229,12 +1230,19 @@ struct llama_server_context
         }
         else
         {
-            const float *data = llama_get_embeddings(ctx);
-            std::vector<float> embedding(data, data + n_embd);
-            res.result_json = json
-            {
-                {"embedding", embedding},
-            };
+            for (int i = 0; i < batch.n_tokens; ++i) {
+                if (!batch.logits[i] || batch.seq_id[i][0] != slot.id) {
+                    continue;
+                }
+
+                const float * data = llama_get_embeddings_ith(ctx, i);
+                std::vector<float> embedding(data, data + n_embd);
+
+                res.result_json = json
+                {
+                    {"embedding", embedding },
+                };
+            }
         }
         queue_results.send(res);
     }
@@ -1845,7 +1853,7 @@ struct llama_server_context
                                 ga_i += ga_w/ga_n;
                             }
                         }
-                        llama_batch_add(batch, prefix_tokens[slot.n_past], system_tokens.size() + slot_npast, {slot.id }, false);
+                        llama_batch_add(batch, prefix_tokens[slot.n_past], system_tokens.size() + slot_npast, { slot.id }, false);
                         slot_npast++;
                     }
 
@@ -1881,7 +1889,7 @@ struct llama_server_context
 
         for (int32_t i = 0; i < (int32_t) batch.n_tokens; i += n_batch)
         {
-            const int32_t n_tokens = std::min(n_batch, (int32_t) (batch.n_tokens - i));
+            const int32_t n_tokens = std::min(n_batch, batch.n_tokens - i);
 
             for (auto & slot : slots)
             {
@@ -1954,7 +1962,7 @@ struct llama_server_context
                 // prompt evaluated for embedding
                 if (slot.embedding)
                 {
-                    send_embedding(slot);
+                    send_embedding(slot, batch_view);
                     slot.release();
                     slot.i_batch = -1;
                     continue;
@@ -2330,7 +2338,6 @@ static void server_params_parse(int argc, char **argv, server_params &sparams,
                 break;
             }
             params.n_batch = std::stoi(argv[i]);
-            params.n_batch = std::min(512, params.n_batch);
         }
         else if (arg == "--gpu-layers" || arg == "-ngl" || arg == "--n-gpu-layers")
         {