Make Categorize see more chat hisotry. (#4538)

### What problem does this PR solve?

#4521

### Type of change
- [x] Performance Improvement

agent/component/categorize.py

@@ -39,13 +39,13 @@ class CategorizeParam(GenerateParam):
             if not v.get("to"):
                 raise ValueError(f"[Categorize] 'To' of category {k} can not be empty!")
 
-    def get_prompt(self):
+    def get_prompt(self, chat_hist):
         cate_lines = []
         for c, desc in self.category_description.items():
             for line in desc.get("examples", "").split("\n"):
                 if not line:
                     continue
-                cate_lines.append("Question: {}\tCategory: {}".format(line, c))
+                cate_lines.append("USER: {}\nCategory: {}".format(line, c))
         descriptions = []
         for c, desc in self.category_description.items():
             if desc.get("description"):
@@ -62,11 +62,15 @@ class CategorizeParam(GenerateParam):
         {}
         You could learn from the above examples.
         Just mention the category names, no need for any additional words.
+        
+        ---- Real Data ----
+        {}
         """.format(
             len(self.category_description.keys()),
             "/".join(list(self.category_description.keys())),
             "\n".join(descriptions),
-            "- ".join(cate_lines)
+            "- ".join(cate_lines),
+            chat_hist
         )
         return self.prompt
 
@@ -76,9 +80,8 @@ class Categorize(Generate, ABC):
 
     def _run(self, history, **kwargs):
         input = self.get_input()
-        input = "Question: " + (list(input["content"])[-1] if "content" in input else "") + "\tCategory: "
         chat_mdl = LLMBundle(self._canvas.get_tenant_id(), LLMType.CHAT, self._param.llm_id)
-        ans = chat_mdl.chat(self._param.get_prompt(), [{"role": "user", "content": input}],
+        ans = chat_mdl.chat(self._param.get_prompt(input), [{"role": "user", "content": "\nCategory: "}],
                             self._param.gen_conf())
         logging.debug(f"input: {input}, answer: {str(ans)}")
         for c in self._param.category_description.keys():