Deploy Gemma-7B using vLLM on Inferless

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Introduction

Google’s Gemma release introduces a family of four new LLMs, offered in two sizes (2B and 7B), with options for both base and instruction-tuned variants. Gemma 2B and 7B are trained on 6T tokens for 7B Gemma and 2T tokens for 2B Gemma respectively.

Gemma models exhibit robust performance across academic benchmarks for language understanding, reasoning, and safety. Additionally, they surpass similarly sized open models on 11 out of 18 text-based tasks.

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Our Observations

We have deployed the gemma-7b base version of the model using vLLM on an A100 GPU(80GB). Here are our observations:

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Defining Dependencies

We are using the vLLM library, which boost the inference speed of you LLM. for deploying the gemma-7b base version of the model.

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Constructing the GitHub/GitLab Template

Now quickly construct the GitHub/GitLab template, this process is mandatory and make sure you don’t add any file named model.py.

Gemma-7B/
├── app.py
├── inferless.yaml
├── input_schema.py
└── inferless-runtime-config.yaml

You can also add other files to this directory.

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Create the class for inference

In the app.py we will define the class and import all the required functions

1. def initialize: In this function, you will initialize your model and the required variables. You can adjust the gpu_memory_utilization parameter to reduce GPU usage.

2. def infer: This function gets called for every request that you send. Here you can define all the steps that are required for the inference. You can also pass custom values for inference and pass it through inputs(dict) parameter.

3. def finalize: This function cleans up all the allocated memory.

from vllm import LLM, SamplingParams
from huggingface_hub import snapshot_download
import os

class InferlessPythonModel:
    def initialize(self):
        repo_id = "google/gemma-7b"
        # Use Inferless volumes to store your model
        # Replace the volume_name with your volume
        model_store = f"/var/nfs-mount/common_llm/{repo_id}"
        os.makedirs(f"/var/nfs-mount/common_llm/{repo_id}", exist_ok=True)
        
        snapshot_download(
                    repo_id,
                    local_dir=model_store,
                    # Hugging face token is required for gated model
                    token="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",
                    ignore_patterns=["*.gguf"])
        self.sampling_params = SamplingParams(temperature=0.7, top_p=0.95,max_tokens=256)
        self.llm = LLM(model=model_store,gpu_memory_utilization=0.9)

    def infer(self, inputs):
        prompts = inputs["prompt"]
        result = self.llm.generate(prompts, self.sampling_params)
        result_output = [output.outputs[0].text for output in result]

        return {'gresult': result_output[0]}

    def finalize(self):
        pass

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Create the Input Schema

We have to create a input_schema.py in your GitHub/Gitlab repository this will help us create the Input parameters. You can checkout our documentation on Input / Output Schema.

For this tutorial, we have defined a parameter prompt which is required during the API call. Now lets create the input_schema.py.

INPUT_SCHEMA = {
    "prompt": {
        'datatype': 'STRING',
        'required': True,
        'shape': [1],
        'example': ["What is quantization?"]
    }
}

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Creating the Custom Runtime

This is a mandatory step where we allow the users to upload their custom runtime through inferless-runtime-config.yaml.

build:
  cuda_version: "12.1.1"
  system_packages:
    - "libssl-dev"
  python_packages:
    - "vllm==0.3.2"

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Method A: Deploying the model on Inferless Platform

Inferless supports multiple ways of importing your model. For this tutorial, we will use GitHub.

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Step 1: Login to the inferless dashboard can click on Import model button

Navigate to your desired workspace in Inferless and Click on Add a custom model button that you see on the top right. An import wizard will open up.

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Step 2: Follow the UI to complete the model Import

• Select the GitHub/GitLab Integration option to connect your source code repository with the deployment environment.
• Navigate to the specific GitHub repository that contains your model’s code. Here, you will need to identify and enter the name of the model you wish to import.
• Choose the appropriate type of machine that suits your model’s requirements. Additionally, specify the minimum and maximum number of replicas to define the scalability range for deploying your model.
• Optionally, you have the option to enable automatic build and deployment. This feature triggers a new deployment automatically whenever there is a new code push to your repository.
• If your model requires additional software packages, configure the Custom Runtime settings by including necessary pip or apt packages. Also, set up environment variables such as Inference Timeout, Container Concurrency, and Scale Down Timeout to tailor the runtime environment according to your needs.
• Wait for the validation process to complete, ensuring that all settings are correct and functional. Once validation is successful, click on the “Import” button to finalize the import of your model.

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Step 3: Wait for the model build to complete usually takes ~5-10 minutes

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Step 4: Use the APIs to call the model

Once the model is in ‘Active’ status you can click on the ‘API’ page to call the model

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Here is the Demo:

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Method B: Deploying the model on Inferless CLI

Inferless allows you to deploy your model using Inferless-CLI. Follow the steps to deploy using Inferless CLI.

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Clone the repository of the model

Let’s begin by cloning the model repository:

git clone https://github.com/inferless/Gemma-7B.git

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Deploy the Model

To deploy the model using Inferless CLI, execute the following command:

inferless deploy --gpu A100 --runtime inferless-runtime-config.yaml

Explanation of the Command:

• --gpu A100: Specifies the GPU type for deployment. Available options include A10, A100, and T4.
• --runtime inferless-runtime-config.yaml: Defines the runtime configuration file. If not specified, the default Inferless runtime is used.