code: from langchain.agents.tools import Tool
  from langchain.chains import LLMMathChain
  from langchain.chat_models import ChatOpenAI
  from langchain.llms import OpenAI
  from langchain_experimental.plan_and_execute import (
      PlanAndExecute,
      load_agent_executor,
      load_chat_planner,
  )
  
  llm = OpenAI(temperature=0)
  llm_math_chain = LLMMathChain.from_llm(llm=llm, verbose=True)
  tools = [
      Tool(
          name="Calculator",
          func=llm_math_chain.run,
          description="useful for when you need to answer questions about math",
      ),
  ]
  
  model = ChatOpenAI(temperature=0)
  
  planner = load_chat_planner(model)
  executor = load_agent_executor(model, tools, verbose=True)
  agent = PlanAndExecute(planner=planner, executor=executor, verbose=True)
  
  
  if __name__ == "__main__":
      agent.run(
          "Who is Leo DiCaprio's girlfriend? What is her current age raised to the 0.43 power?"
      )
  
apis: langchain_experimental.plan_and_execute.load_chat_planner langchain.chat_models.ChatOpenAI langchain.llms.OpenAI langchain.chains.LLMMathChain.from_llm langchain.agents.tools.Tool langchain_experimental.plan_and_execute.load_agent_executor langchain_experimental.plan_and_execute.PlanAndExecute
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