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66 lines
1.9 KiB
Python
66 lines
1.9 KiB
Python
"""Generic agent."""
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from typing import List
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from pydantic import BaseModel, Field
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from langchain.tools import Tool
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from langchain.agents import AgentExecutor
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from langchain.chat_models import ChatOpenAI as OpenAI
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from langchain.tools.render import render_text_description
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from langchain.agents.format_scratchpad import format_log_to_str
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from langchain.agents.output_parsers import ReActSingleInputOutputParser
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from .prompts import Prompts
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class Agent(BaseModel):
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"""Generic agent implementation."""
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role: str = Field(description="Role of the agent")
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goal: str = Field(description="Objective of the agent")
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backstory: str = Field(description="Backstory of the agent")
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tools: List[Tool] = Field(
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description="Tools at agents disposal",
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default=[]
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)
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prompts: Prompts = Field(
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description="Prompts class for the agent.",
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default=Prompts
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)
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llm: str = Field(
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description="LLM of the agent",
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default=OpenAI(
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temperature=0.7,
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model="gpt-4",
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verbose=True
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)
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)
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def execute(self, task: str) -> str:
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"""
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Execute a task with the agent.
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Parameters:
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task (str): Task to execute
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Returns:
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output (str): Output of the agent
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"""
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prompt = Prompts.AGENT_EXECUTION_PROMPT.partial(
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tools=render_text_description(self.tools),
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tool_names=self.__tools_names(),
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backstory=self.backstory,
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role=self.role,
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goal=self.goal,
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)
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return self.__run(task, prompt, self.tools)
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def __run(self, input: str, prompt: str, tools: List[Tool]) -> str:
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chat_with_bind = self.llm.bind(stop=["\nObservation"])
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agent = {
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"input": lambda x: x["input"],
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"agent_scratchpad": lambda x: format_log_to_str(x['intermediate_steps'])
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} | prompt | chat_with_bind | ReActSingleInputOutputParser()
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agent_executor = AgentExecutor(agent=agent, tools=tools, verbose=True, handle_parsing_errors=True)
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return agent_executor.invoke({"input": input})['output']
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def __tools_names(self) -> str:
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return ", ".join([t.name for t in self.tools])
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