Tagging (#4426)

### What problem does this PR solve?

#4367

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/apps/sdk/doc.py

@@ -16,7 +16,7 @@
 import pathlib
 import datetime
 
-from api.db.services.dialog_service import keyword_extraction
+from api.db.services.dialog_service import keyword_extraction, label_question
 from rag.app.qa import rmPrefix, beAdoc
 from rag.nlp import rag_tokenizer
 from api.db import LLMType, ParserType
@@ -276,6 +276,7 @@ def update_doc(tenant_id, dataset_id, document_id):
             "one",
             "knowledge_graph",
             "email",
+            "tag"
         }
         if req.get("chunk_method") not in valid_chunk_method:
             return get_error_data_result(
@@ -1355,6 +1356,7 @@ def retrieval_test(tenant_id):
             doc_ids,
             rerank_mdl=rerank_mdl,
             highlight=highlight,
+            rank_feature=label_question(question, kbs)
         )
         for c in ranks["chunks"]:
             c.pop("vector", None)