diff --git a/metagpt/roles/ml_engineer_simple.py b/metagpt/roles/ml_engineer_simple.py
deleted file mode 100644
index 9ff1c9880..000000000
--- a/metagpt/roles/ml_engineer_simple.py
+++ /dev/null
@@ -1,135 +0,0 @@
-import re
-from datetime import datetime
-from typing import List
-
-import fire
-
-from metagpt.actions.ask_review import AskReview, ReviewConst
-from metagpt.actions.execute_code import ExecutePyCode
-from metagpt.actions.write_analysis_code import WriteCodeByGenerate
-from metagpt.logs import logger
-from metagpt.memory import Memory
-from metagpt.roles import Role
-from metagpt.roles.kaggle_manager import DownloadData
-from metagpt.schema import Message
-from metagpt.utils.save_code import save_code_file
-
-STRUCTURAL_CONTEXT_SIMPLE = """
-## User Requirement
-{user_requirement}
-## Data Description
-{data_desc}
-"""
-
-JUDGE_PROMPT_TEMPLATE = """
-# User Requirement
-{user_requirement}
------
-# Context
-{context}
------
-# State
-Output "Ture" or "False". Judging from the code perspective, whether the user's needs have been completely fulfilled.
-=====
-# Output State("Ture" or "False") firstly, then output Thought and Next Steps for the code requirements based on the context respectively in one sentence
-State:
-Thought:
-Next Steps:
-"""
-
-
-class MLEngineerSimple(Role):
-    def __init__(self, name="ABC", profile="MLEngineerSimple", goal="", auto_run: bool = False):
-        super().__init__(name=name, profile=profile, goal=goal)
-        self._set_react_mode(react_mode="react")
-        self._watch([DownloadData])
-        self._init_actions([WriteCodeByGenerate, ExecutePyCode])
-
-        self.goal = goal
-        self.data_desc = ""
-        self.use_tools = False
-        self.use_code_steps = False
-        self.execute_code = ExecutePyCode()
-        self.auto_run = auto_run
-
-        # memory for working on each task, discarded each time a task is done
-        self.working_memory = Memory()
-
-    async def _act(self):
-        memories = self.get_memories()
-        if memories:
-            latest_event = memories[-1].cause_by
-            if latest_event == DownloadData:
-                self.data_desc = memories[-1].content
-
-        await self._act_no_plan()
-
-        # save code using datetime.now or  keywords related to the goal of your project (plan.goal).
-        project_record = datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
-        save_code_file(name=project_record, code_context=self.execute_code.nb, file_format="ipynb")
-
-    async def _act_no_plan(self, max_retry: int = 20):
-        counter = 0
-        state = False
-        while not state and counter < max_retry:
-            context = self.get_useful_memories()
-            print(f"memories数量：{len(context)}")
-            # print("===\n" +str(context) + "\n===")
-            code = await WriteCodeByGenerate().run(context=context, temperature=0.0, only_code=True)
-            cause_by = WriteCodeByGenerate
-            self.working_memory.add(Message(content=code, role="assistant", cause_by=cause_by))
-
-            result, success = await self.execute_code.run(code)
-            print(result)
-            self.working_memory.add(Message(content=result, role="user", cause_by=ExecutePyCode))
-
-            if "!pip" in code:
-                success = False
-
-            counter += 1
-
-            if not success and counter >= max_retry:
-                logger.info("coding failed!")
-                review, _ = await self._ask_review(auto_run=False, trigger=ReviewConst.CODE_REVIEW_TRIGGER)
-                if ReviewConst.CHANGE_WORD[0] in review:
-                    counter = 0  # redo the task again with help of human suggestions
-
-            completed_plan_memory = self.get_useful_memories()  # completed plan as a outcome
-            self.rc.memory.add(completed_plan_memory[0])  # add to persistent memory
-            prompt = JUDGE_PROMPT_TEMPLATE.format(user_requirement=self.goal, context=completed_plan_memory)
-            rsp = await self._llm.aask(prompt)
-            self.working_memory.add(Message(content=rsp, role="system"))
-
-            matches = re.findall(r"\b(True|False)\b", rsp)
-            state = False if "False" in matches else True
-
-    async def _ask_review(self, auto_run: bool = None, trigger: str = ReviewConst.TASK_REVIEW_TRIGGER):
-        auto_run = auto_run or self.auto_run
-        if not auto_run:
-            context = self.get_useful_memories()
-            review, confirmed = await AskReview().run(context=context[-5:], trigger=trigger)
-            if not confirmed:
-                self.working_memory.add(Message(content=review, role="user", cause_by=AskReview))
-            return review, confirmed
-        return "", True
-
-    def get_useful_memories(self) -> List[Message]:
-        """find useful memories only to reduce context length and improve performance"""
-        user_requirement = self.goal
-        context = STRUCTURAL_CONTEXT_SIMPLE.format(user_requirement=user_requirement, data_desc=self.data_desc)
-        context_msg = [Message(content=context, role="user")]
-
-        return context_msg + self.get_working_memories(6)
-
-    def get_working_memories(self, num=0) -> List[Message]:
-        return self.working_memory.get(num)  # 默认为6
-
-
-if __name__ == "__main__":
-    requirement = "Run data analysis on sklearn Iris dataset, include a plot"
-
-    async def main(requirement: str = requirement, auto_run: bool = True):
-        role = MLEngineerSimple(goal=requirement, auto_run=auto_run)
-        await role.run(requirement)
-
-    fire.Fire(main)