Fix multiple generate (#1722)

### What problem does this PR solve?

#1625 

### Type of change

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

graph/component/answer.py

@@ -59,8 +59,10 @@ class Answer(ComponentBase, ABC):
         stream = self.get_stream_input()
         if isinstance(stream, pd.DataFrame):
             res = stream
+            answer = ""
             for ii, row in stream.iterrows():
-                yield row.to_dict()
+                answer += row.to_dict()["content"]
+                yield {"content": answer}
         else:
             for st in stream():
                 res = st

graph/component/generate.py

@@ -67,6 +67,34 @@ class Generate(ComponentBase):
         cpnts = [para["component_id"] for para in self._param.parameters]
         return cpnts
 
+    def set_cite(self, retrieval_res, answer):
+        answer, idx = retrievaler.insert_citations(answer, [ck["content_ltks"] for _, ck in retrieval_res.iterrows()],
+                                                   [ck["vector"] for _, ck in retrieval_res.iterrows()],
+                                                   LLMBundle(self._canvas.get_tenant_id(), LLMType.EMBEDDING,
+                                                             self._canvas.get_embedding_model()), tkweight=0.7,
+                                                   vtweight=0.3)
+        doc_ids = set([])
+        recall_docs = []
+        for i in idx:
+            did = retrieval_res.loc[int(i), "doc_id"]
+            if did in doc_ids: continue
+            doc_ids.add(did)
+            recall_docs.append({"doc_id": did, "doc_name": retrieval_res.loc[int(i), "docnm_kwd"]})
+
+        del retrieval_res["vector"]
+        del retrieval_res["content_ltks"]
+
+        reference = {
+            "chunks": [ck.to_dict() for _, ck in retrieval_res.iterrows()],
+            "doc_aggs": recall_docs
+        }
+
+        if answer.lower().find("invalid key") >= 0 or answer.lower().find("invalid api") >= 0:
+            answer += " Please set LLM API-Key in 'User Setting -> Model Providers -> API-Key'"
+        res = {"content": answer, "reference": reference}
+
+        return res
+
     def _run(self, history, **kwargs):
         chat_mdl = LLMBundle(self._canvas.get_tenant_id(), LLMType.CHAT, self._param.llm_id)
         prompt = self._param.prompt
@@ -87,9 +115,8 @@ class Generate(ComponentBase):
             prompt = re.sub(r"\{%s\}" % n, str(v), prompt)
 
         downstreams = self._canvas.get_component(self._id)["downstream"]
-        if kwargs.get("stream") \
+        if kwargs.get("stream") and len(downstreams) == 1 and self._canvas.get_component(downstreams[0])[
-                and len(downstreams) == 1 \
+            "obj"].component_name.lower() == "answer":
-                and self._canvas.get_component(downstreams[0])["obj"].component_name.lower() == "answer":
             return partial(self.stream_output, chat_mdl, prompt, retrieval_res)
 
         if "empty_response" in retrieval_res.columns:
@@ -97,27 +124,8 @@ class Generate(ComponentBase):
 
         ans = chat_mdl.chat(prompt, self._canvas.get_history(self._param.message_history_window_size),
                             self._param.gen_conf())
-
         if self._param.cite and "content_ltks" in retrieval_res.columns and "vector" in retrieval_res.columns:
-            ans, idx = retrievaler.insert_citations(ans,
+            df = self.set_cite(retrieval_res, ans)
-                                                    [ck["content_ltks"]
-                                                     for _, ck in retrieval_res.iterrows()],
-                                                    [ck["vector"]
-                                                     for _, ck in retrieval_res.iterrows()],
-                                                    LLMBundle(self._canvas.get_tenant_id(), LLMType.EMBEDDING,
-                                                              self._canvas.get_embedding_model()),
-                                                    tkweight=0.7,
-                                                    vtweight=0.3)
-            del retrieval_res["vector"]
-            retrieval_res = retrieval_res.to_dict("records")
-            df = []
-            for i in idx:
-                df.append(retrieval_res[int(i)])
-                r = re.search(r"^((.|[\r\n])*? ##%s\$\$)" % str(i), ans)
-                assert r, f"{i} => {ans}"
-                df[-1]["content"] = r.group(1)
-                ans = re.sub(r"^((.|[\r\n])*? ##%s\$\$)" % str(i), "", ans)
-            if ans: df.append({"content": ans})
             return pd.DataFrame(df)
 
         return Generate.be_output(ans)
@@ -138,34 +146,7 @@ class Generate(ComponentBase):
             yield res
 
         if self._param.cite and "content_ltks" in retrieval_res.columns and "vector" in retrieval_res.columns:
-            answer, idx = retrievaler.insert_citations(answer,
+            res = self.set_cite(retrieval_res, answer)
-                                                       [ck["content_ltks"]
-                                                        for _, ck in retrieval_res.iterrows()],
-                                                       [ck["vector"]
-                                                        for _, ck in retrieval_res.iterrows()],
-                                                       LLMBundle(self._canvas.get_tenant_id(), LLMType.EMBEDDING,
-                                                                 self._canvas.get_embedding_model()),
-                                                       tkweight=0.7,
-                                                       vtweight=0.3)
-            doc_ids = set([])
-            recall_docs = []
-            for i in idx:
-                did = retrieval_res.loc[int(i), "doc_id"]
-                if did in doc_ids: continue
-                doc_ids.add(did)
-                recall_docs.append({"doc_id": did, "doc_name": retrieval_res.loc[int(i), "docnm_kwd"]})
-
-            del retrieval_res["vector"]
-            del retrieval_res["content_ltks"]
-
-            reference = {
-                "chunks": [ck.to_dict() for _, ck in retrieval_res.iterrows()],
-                "doc_aggs": recall_docs
-            }
-
-            if answer.lower().find("invalid key") >= 0 or answer.lower().find("invalid api") >= 0:
-                answer += " Please set LLM API-Key in 'User Setting -> Model Providers -> API-Key'"
-            res = {"content": answer, "reference": reference}
             yield res
 
         self.set_output(res)