BashChain
这个notebook展示了如何使用LLMs和bash进程执行简单的文件系统命令。
from langchain.chains import LLMBashChain
from langchain.llms import OpenAI
llm = OpenAI(temperature=0)
text = "Please write a bash script that prints 'Hello World' to the console."
bash_chain = LLMBashChain.from_llm(llm, verbose=True)
bash_chain.run(text)你也可以自定义使用的提示。下面是一个自定义提示的示例，避免使用“echo”实用程序。
from langchain.prompts.prompt import PromptTemplate
from langchain.chains.llm_bash.prompt import BashOutputParser
_PROMPT_TEMPLATE = """If someone asks you to perform a task, your job is to come up with a series of bash commands that will perform the task. There is no need to put "#!/bin/bash" in your answer. Make sure to reason step by step, using this format:
Question: "copy the files in the directory named 'target' into a new directory at the same level as target called 'myNewDirectory'"
I need to take the following actions:
- List all files in the directory
- Create a new directory
- Copy the files from the first directory into the second directory
'```bash
ls
mkdir myNewDirectory
cp -r target/* myNewDirectory
Do not use 'echo' when writing the script.
That is the format. Begin!
Question: {question}
"""
PROMPT = PromptTemplate(input_variables=["question"], template=_PROMPT_TEMPLATE, output_parser=BashOutputParser())默认情况下，该链将在每次调用时在单独的子进程中运行。这可以通过使用持久的bash进程实例化来更改。
from langchain.utilities.bash import BashProcess
persistent_process = BashProcess(persistent=True)
bash_chain = LLMBashChain.from_llm(llm, bash_process=persistent_process, verbose=True)
text = "List the current directory then move up a level."
bash_chain.run(text)
bash_chain.run(text) # 运行相同的命令，查看状态是否在调用之间保持不变