mirror of
https://github.com/hwchase17/langchain
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71 lines
2.4 KiB
Markdown
71 lines
2.4 KiB
Markdown
# stepback-qa-prompting
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This template replicates the "Step-Back" prompting technique that improves performance on complex questions by first asking a "step back" question.
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This technique can be combined with regular question-answering applications by doing retrieval on both the original and step-back question.
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Read more about this in the paper [here](https://arxiv.org/abs/2310.06117) and an excellent blog post by Cobus Greyling [here](https://cobusgreyling.medium.com/a-new-prompt-engineering-technique-has-been-introduced-called-step-back-prompting-b00e8954cacb)
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We will modify the prompts slightly to work better with chat models in this template.
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## Environment Setup
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Set the `OPENAI_API_KEY` environment variable to access the OpenAI models.
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## Usage
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To use this package, you should first have the LangChain CLI installed:
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```shell
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pip install -U langchain-cli
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```
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To create a new LangChain project and install this as the only package, you can do:
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```shell
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langchain app new my-app --package stepback-qa-prompting
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```
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If you want to add this to an existing project, you can just run:
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```shell
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langchain app add stepback-qa-prompting
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```
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And add the following code to your `server.py` file:
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```python
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from stepback_qa_prompting.chain import chain as stepback_qa_prompting_chain
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add_routes(app, stepback_qa_prompting_chain, path="/stepback-qa-prompting")
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```
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(Optional) Let's now configure LangSmith.
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LangSmith will help us trace, monitor and debug LangChain applications.
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LangSmith is currently in private beta, you can sign up [here](https://smith.langchain.com/).
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If you don't have access, you can skip this section
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```shell
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export LANGCHAIN_TRACING_V2=true
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export LANGCHAIN_API_KEY=<your-api-key>
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export LANGCHAIN_PROJECT=<your-project> # if not specified, defaults to "default"
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```
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If you are inside this directory, then you can spin up a LangServe instance directly by:
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```shell
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langchain serve
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```
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This will start the FastAPI app with a server running locally at
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[http://localhost:8000](http://localhost:8000)
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We can see all templates at [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs)
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We can access the playground at [http://127.0.0.1:8000/stepback-qa-prompting/playground](http://127.0.0.1:8000/stepback-qa-prompting/playground)
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We can access the template from code with:
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```python
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from langserve.client import RemoteRunnable
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runnable = RemoteRunnable("http://localhost:8000/stepback-qa-prompting")
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``` |