Fix: jina embedding issue (#11628)

### What problem does this PR solve?

Fix: jina embedding issue #11614 
Feat: Add jina embedding v4

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

conf/llm_factories.json

@@ -1194,6 +1194,12 @@
                     "tags": "TEXT EMBEDDING",
                     "max_tokens": 8196,
                     "model_type": "embedding"
+                },
+                {
+                    "llm_name": "jina-embeddings-v4",
+                    "tags": "TEXT EMBEDDING",
+                    "max_tokens": 32768,
+                    "model_type": "embedding"
                 }
             ]
         },

rag/llm/embedding_model.py

@@ -349,35 +349,6 @@ class YoudaoEmbed(Base):
         return np.array(embds[0]), num_tokens_from_string(text)
 
 
-class JinaEmbed(Base):
-    _FACTORY_NAME = "Jina"
-
-    def __init__(self, key, model_name="jina-embeddings-v3", base_url="https://api.jina.ai/v1/embeddings"):
-        self.base_url = "https://api.jina.ai/v1/embeddings"
-        self.headers = {"Content-Type": "application/json", "Authorization": f"Bearer {key}"}
-        self.model_name = model_name
-
-    def encode(self, texts: list):
-        texts = [truncate(t, 8196) for t in texts]
-        batch_size = 16
-        ress = []
-        token_count = 0
-        for i in range(0, len(texts), batch_size):
-            data = {"model": self.model_name, "input": texts[i : i + batch_size], "encoding_type": "float"}
-            response = requests.post(self.base_url, headers=self.headers, json=data)
-            try:
-                res = response.json()
-                ress.extend([d["embedding"] for d in res["data"]])
-                token_count += self.total_token_count(res)
-            except Exception as _e:
-                log_exception(_e, response)
-        return np.array(ress), token_count
-
-    def encode_queries(self, text):
-        embds, cnt = self.encode([text])
-        return np.array(embds[0]), cnt
-
-
 class JinaMultiVecEmbed(Base):
     _FACTORY_NAME = "Jina"
 
@@ -403,11 +374,28 @@ class JinaMultiVecEmbed(Base):
                     img_b64s = base64.b64encode(text).decode('utf8')
                 input.append({"image": img_b64s})  # base64 encoded image
         for i in range(0, len(texts), batch_size):
-            data = {"model": self.model_name, "task": task, "truncate": True, "return_multivector": True, "input": input[i : i + batch_size]}
+            data = {"model": self.model_name, "input": input[i : i + batch_size]}
+            if "v4" in self.model_name:
+                data["return_multivector"] = True
+            
+            if "v3" in self.model_name or "v4" in self.model_name:
+                data['task'] = task
+                data['truncate'] = True
+
             response = requests.post(self.base_url, headers=self.headers, json=data)
             try:
                 res = response.json()
-                ress.extend([d["embeddings"] for d in res["data"]])
+                for d in res['data']:
+                    if data.get("return_multivector", False): # v4
+                        token_embs = np.asarray(d['embeddings'], dtype=np.float32)
+                        chunk_emb = token_embs.mean(axis=0)
+                    
+                    else:
+                        # v2/v3
+                        chunk_emb = np.asarray(d['embedding'], dtype=np.float32)
+
+                    ress.append(chunk_emb)
+
                 token_count += self.total_token_count(res)
             except Exception as _e:
                 log_exception(_e, response)