mirror of https://github.com/hwchase17/langchain
Update Banana.dev docs to latest correct usage (#10183)
- Description: this PR updates all Banana.dev-related docs to match the latest client usage. The code in the docs before this PR were out of date and would never run. - Issue: [#6404](https://github.com/langchain-ai/langchain/issues/6404) - Dependencies: - - Tag maintainer: - Twitter handle: [BananaDev_ ](https://twitter.com/BananaDev_ )pull/10216/head
Nik
1 year ago
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# Banana
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This page covers how to use the Banana ecosystem within LangChain.
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It is broken into two parts: installation and setup, and then references to specific Banana wrappers.
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Banana provided serverless GPU inference for AI models, including a CI/CD build pipeline and a simple Python framework (Potassium) to server your models.
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This page covers how to use the [Banana](https://www.banana.dev) ecosystem within LangChain.
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It is broken into two parts:
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* installation and setup,
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* and then references to specific Banana wrappers.
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## Installation and Setup
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- Install with `pip install banana-dev`
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- Get an Banana api key and set it as an environment variable (`BANANA_API_KEY`)
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- Get an Banana api key from the [Banana.dev dashboard](https://app.banana.dev) and set it as an environment variable (`BANANA_API_KEY`)
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- Get your model's key and url slug from the model's details page
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## Define your Banana Template
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If you want to use an available language model template you can find one [here](https://app.banana.dev/templates/conceptofmind/serverless-template-palmyra-base).
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This template uses the Palmyra-Base model by [Writer](https://writer.com/product/api/).
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You can check out an example Banana repository [here](https://github.com/conceptofmind/serverless-template-palmyra-base).
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You'll need to set up a Github repo for your Banana app. You can get started in 5 minutes using [this guide](https://docs.banana.dev/banana-docs/).
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Alternatively, for a ready-to-go LLM example, you can check out Banana's [CodeLlama-7B-Instruct-GPTQ](https://github.com/bananaml/demo-codellama-7b-instruct-gptq) GitHub repository. Just fork it and deploy it within Banana.
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Other starter repos are available [here](https://github.com/orgs/bananaml/repositories?q=demo-&type=all&language=&sort=).
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## Build the Banana app
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Banana Apps must include the "output" key in the return json.
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There is a rigid response structure.
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To use Banana apps within Langchain, they must include the `outputs` key
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in the returned json, and the value must be a string.
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```python
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# Return the results as a dictionary
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result = {'output': result}
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result = {'outputs': result}
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```
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An example inference function would be:
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```python
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def inference(model_inputs:dict) -> dict:
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global model
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global tokenizer
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# Parse out your arguments
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prompt = model_inputs.get('prompt', None)
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if prompt == None:
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return {'message': "No prompt provided"}
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# Run the model
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input_ids = tokenizer.encode(prompt, return_tensors='pt').cuda()
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output = model.generate(
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input_ids,
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max_length=100,
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do_sample=True,
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top_k=50,
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top_p=0.95,
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num_return_sequences=1,
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temperature=0.9,
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early_stopping=True,
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no_repeat_ngram_size=3,
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num_beams=5,
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length_penalty=1.5,
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repetition_penalty=1.5,
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bad_words_ids=[[tokenizer.encode(' ', add_prefix_space=True)[0]]]
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)
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result = tokenizer.decode(output[0], skip_special_tokens=True)
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# Return the results as a dictionary
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result = {'output': result}
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return result
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@app.handler("/")
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def handler(context: dict, request: Request) -> Response:
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"""Handle a request to generate code from a prompt."""
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model = context.get("model")
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tokenizer = context.get("tokenizer")
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max_new_tokens = request.json.get("max_new_tokens", 512)
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temperature = request.json.get("temperature", 0.7)
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prompt = request.json.get("prompt")
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prompt_template=f'''[INST] Write code to solve the following coding problem that obeys the constraints and passes the example test cases. Please wrap your code answer using ```:
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{prompt}
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[/INST]
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'''
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input_ids = tokenizer(prompt_template, return_tensors='pt').input_ids.cuda()
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output = model.generate(inputs=input_ids, temperature=temperature, max_new_tokens=max_new_tokens)
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result = tokenizer.decode(output[0])
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return Response(json={"outputs": result}, status=200)
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```
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You can find a full example of a Banana app [here](https://github.com/conceptofmind/serverless-template-palmyra-base/blob/main/app.py).
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This example is from the `app.py` file in [CodeLlama-7B-Instruct-GPTQ](https://github.com/bananaml/demo-codellama-7b-instruct-gptq).
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## Wrappers
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### LLM
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There exists an Banana LLM wrapper, which you can access with
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Within Langchain, there exists a Banana LLM wrapper, which you can access with
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```python
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from langchain.llms import Banana
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```
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You need to provide a model key located in the dashboard:
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You need to provide a model key and model url slug, which you can get from the model's details page in the [Banana.dev dashboard](https://app.banana.dev).
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```python
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llm = Banana(model_key="YOUR_MODEL_KEY")
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llm = Banana(model_key="YOUR_MODEL_KEY", model_url_slug="YOUR_MODEL_URL_SLUG")
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```
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