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Runhouse

Runhouse allows remote compute and data across environments and users. See the Runhouse docs.

This example goes over how to use LangChain and Runhouse to interact with models hosted on your own GPU, or on-demand GPUs on AWS, GCP, AWS, or Lambda.

Note: Code uses SelfHosted name instead of the Runhouse.

%pip install --upgrade --quiet  runhouse
import runhouse as rh
from langchain.chains import LLMChain
from langchain_community.llms import SelfHostedHuggingFaceLLM, SelfHostedPipeline
from langchain_core.prompts import PromptTemplate
INFO | 2023-04-17 16:47:36,173 | No auth token provided, so not using RNS API to save and load configs
# For an on-demand A100 with GCP, Azure, or Lambda
gpu = rh.cluster(name="rh-a10x", instance_type="A100:1", use_spot=False)

# For an on-demand A10G with AWS (no single A100s on AWS)
# gpu = rh.cluster(name='rh-a10x', instance_type='g5.2xlarge', provider='aws')

# For an existing cluster
# gpu = rh.cluster(ips=['<ip of the cluster>'],
#                  ssh_creds={'ssh_user': '...', 'ssh_private_key':'<path_to_key>'},
#                  name='rh-a10x')
template = """Question: {question}

Answer: Let's think step by step."""

prompt = PromptTemplate.from_template(template)
llm = SelfHostedHuggingFaceLLM(
    model_id="gpt2", hardware=gpu, model_reqs=["pip:./", "transformers", "torch"]
)
llm_chain = LLMChain(prompt=prompt, llm=llm)
question = "What NFL team won the Super Bowl in the year Justin Beiber was born?"

llm_chain.run(question)
INFO | 2023-02-17 05:42:23,537 | Running _generate_text via gRPC
INFO | 2023-02-17 05:42:24,016 | Time to send message: 0.48 seconds
"\n\nLet's say we're talking sports teams who won the Super Bowl in the year Justin Beiber"

You can also load more custom models through the SelfHostedHuggingFaceLLM interface:

llm = SelfHostedHuggingFaceLLM(
    model_id="google/flan-t5-small",
    task="text2text-generation",
    hardware=gpu,
)
llm("What is the capital of Germany?")
INFO | 2023-02-17 05:54:21,681 | Running _generate_text via gRPC
INFO | 2023-02-17 05:54:21,937 | Time to send message: 0.25 seconds
'berlin'

Using a custom load function, we can load a custom pipeline directly on the remote hardware:

def load_pipeline():
    from transformers import (
        AutoModelForCausalLM,
        AutoTokenizer,
        pipeline,
    )

    model_id = "gpt2"
    tokenizer = AutoTokenizer.from_pretrained(model_id)
    model = AutoModelForCausalLM.from_pretrained(model_id)
    pipe = pipeline(
        "text-generation", model=model, tokenizer=tokenizer, max_new_tokens=10
    )
    return pipe


def inference_fn(pipeline, prompt, stop=None):
    return pipeline(prompt)[0]["generated_text"][len(prompt) :]
llm = SelfHostedHuggingFaceLLM(
    model_load_fn=load_pipeline, hardware=gpu, inference_fn=inference_fn
)
llm("Who is the current US president?")
INFO | 2023-02-17 05:42:59,219 | Running _generate_text via gRPC
INFO | 2023-02-17 05:42:59,522 | Time to send message: 0.3 seconds
'john w. bush'

You can send your pipeline directly over the wire to your model, but this will only work for small models (<2 Gb), and will be pretty slow:

pipeline = load_pipeline()
llm = SelfHostedPipeline.from_pipeline(
    pipeline=pipeline, hardware=gpu, model_reqs=["pip:./", "transformers", "torch"]
)

Instead, we can also send it to the hardware's filesystem, which will be much faster.

import pickle

rh.blob(pickle.dumps(pipeline), path="models/pipeline.pkl").save().to(
    gpu, path="models"
)

llm = SelfHostedPipeline.from_pipeline(pipeline="models/pipeline.pkl", hardware=gpu)

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