debug backend API for TAB 'search' (#2389)

### What problem does this PR solve?
#2247

### Type of change

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

api/apps/chunk_app.py

@@ -261,7 +261,7 @@ def retrieval_test():
     kb_id = req["kb_id"]
     if isinstance(kb_id, str): kb_id = [kb_id]
     doc_ids = req.get("doc_ids", [])
-    similarity_threshold = float(req.get("similarity_threshold", 0.2))
+    similarity_threshold = float(req.get("similarity_threshold", 0.0))
     vector_similarity_weight = float(req.get("vector_similarity_weight", 0.3))
     top = int(req.get("top_k", 1024))
 

api/apps/conversation_app.py

@@ -15,8 +15,8 @@
 #
 import json
 import re
+import traceback
 from copy import deepcopy
-
 from api.db.services.user_service import UserTenantService
 from flask import request, Response
 from flask_login import login_required, current_user
@@ -333,6 +333,8 @@ def mindmap():
                            0.3, 0.3, aggs=False)
     mindmap = MindMapExtractor(chat_mdl)
     mind_map = mindmap([c["content_with_weight"] for c in ranks["chunks"]]).output
+    if "error" in mind_map:
+        return server_error_response(Exception(mind_map["error"]))
     return get_json_result(data=mind_map)
 
 

api/db/services/dialog_service.py

@@ -218,7 +218,7 @@ def chat(dialog, messages, stream=True, **kwargs):
         for ans in chat_mdl.chat_streamly(prompt, msg[1:], gen_conf):
             answer = ans
             delta_ans = ans[len(last_ans):]
-            if num_tokens_from_string(delta_ans) < 12:
+            if num_tokens_from_string(delta_ans) < 16:
                 continue
             last_ans = answer
             yield {"answer": answer, "reference": {}, "audio_binary": tts(tts_mdl, delta_ans)}
@@ -404,7 +404,6 @@ def rewrite(tenant_id, llm_id, question):
 
 
 def tts(tts_mdl, text):
-    return
     if not tts_mdl or not text: return
     bin = b""
     for chunk in tts_mdl.tts(text):