High-performance serving with Triton Inference Server (Preview)

APPLIES TO: Azure CLI ml extension v2 (current)

Learn how to use NVIDIA Triton Inference Server in Azure Machine Learning with Managed online endpoints.

Triton is multi-framework, open-source software that is optimized for inference. It supports popular machine learning frameworks like TensorFlow, ONNX Runtime, PyTorch, NVIDIA TensorRT, and more. It can be used for your CPU or GPU workloads.

In this article, you will learn how to deploy Triton and a model to a managed online endpoint. Information is provided on using both the CLI (command line) and Azure Machine Learning studio.

Note

  • NVIDIA Triton Inference Server is an open-source third-party software that is integrated in Azure Machine Learning.
  • While Azure Machine Learning online endpoints are generally available, using Triton with an online endpoint deployment is still in preview.

Prerequisites

Before following the steps in this article, make sure you have the following prerequisites:

  • A working Python 3.8 (or higher) environment.

  • Access to NCv3-series VMs for your Azure subscription.

    Important

    You may need to request a quota increase for your subscription before you can use this series of VMs. For more information, see NCv3-series.

The information in this article is based on code samples contained in the azureml-examples repository. To run the commands locally without having to copy/paste YAML and other files, clone the repo and then change directories to the cli directory in the repo:

git clone https://github.com/Azure/azureml-examples --depth 1
cd azureml-examples
cd cli

If you haven't already set the defaults for the Azure CLI, save your default settings. To avoid passing in the values for your subscription, workspace, and resource group multiple times, use the following commands. Replace the following parameters with values for your specific configuration:

  • Replace <subscription> with your Azure subscription ID.
  • Replace <workspace> with your Azure Machine Learning workspace name.
  • Replace <resource-group> with the Azure resource group that contains your workspace.
  • Replace <location> with the Azure region that contains your workspace.

Tip

You can see what your current defaults are by using the az configure -l command.

az account set --subscription <subscription>
az configure --defaults workspace=<workspace> group=<resource-group> location=<location>

NVIDIA Triton Inference Server requires a specific model repository structure, where there is a directory for each model and subdirectories for the model version. The contents of each model version subdirectory is determined by the type of the model and the requirements of the backend that supports the model. To see all the model repository structure https://github.com/triton-inference-server/server/blob/main/docs/model_repository.md#model-files

The information in this document is based on using a model stored in ONNX format, so the directory structure of the model repository is <model-repository>/<model-name>/1/model.onnx. Specifically, this model performs image identification.

Deploy using CLI (v2)

APPLIES TO: Azure CLI ml extension v2 (current)

This section shows how you can deploy Triton to managed online endpoint using the Azure CLI with the Machine Learning extension (v2).

Important

For Triton no-code-deployment, testing via local endpoints is currently not supported.

  1. To avoid typing in a path for multiple commands, use the following command to set a BASE_PATH environment variable. This variable points to the directory where the model and associated YAML configuration files are located:

    BASE_PATH=endpoints/online/triton/single-model
    
  2. Use the following command to set the name of the endpoint that will be created. In this example, a random name is created for the endpoint:

    export ENDPOINT_NAME=triton-single-endpt-`echo $RANDOM`
    
  3. Install Python requirements using the following commands:

    pip install numpy
    pip install tritonclient[http]
    pip install pillow
    pip install gevent
    
  4. Create a YAML configuration file for your endpoint. The following example configures the name and authentication mode of the endpoint. The one used in the following commands is located at /cli/endpoints/online/triton/single-model/create-managed-endpoint.yml in the azureml-examples repo you cloned earlier:

    create-managed-endpoint.yaml

    $schema: https://azuremlschemas.azureedge.net/latest/managedOnlineEndpoint.schema.json
    name: my-endpoint
    auth_mode: aml_token
    
  5. To create a new endpoint using the YAML configuration, use the following command:

    az ml online-endpoint create -n $ENDPOINT_NAME -f $BASE_PATH/create-managed-endpoint.yaml
    
  6. Create a YAML configuration file for the deployment. The following example configures a deployment named blue to the endpoint created in the previous step. The one used in the following commands is located at /cli/endpoints/online/triton/single-model/create-managed-deployment.yml in the azureml-examples repo you cloned earlier:

    Important

    For Triton no-code-deployment (NCD) to work, setting type to triton_model​ is required, type: triton_model​. For more information, see CLI (v2) model YAML schema.

    This deployment uses a Standard_NC6s_v3 VM. You may need to request a quota increase for your subscription before you can use this VM. For more information, see NCv3-series.

    $schema: https://azuremlschemas.azureedge.net/latest/managedOnlineDeployment.schema.json
    name: blue
    endpoint_name: my-endpoint
    model:
      name: sample-densenet-onnx-model
      version: 1
      path: ./models
      type: triton_model
    instance_count: 1
    instance_type: Standard_NC6s_v3
    
  7. To create the deployment using the YAML configuration, use the following command:

    az ml online-deployment create --name blue --endpoint $ENDPOINT_NAME -f $BASE_PATH/create-managed-deployment.yaml --all-traffic
    

Invoke your endpoint

Once your deployment completes, use the following command to make a scoring request to the deployed endpoint.

Tip

The file /cli/endpoints/online/triton/single-model/triton_densenet_scoring.py in the azureml-examples repo is used for scoring. The image passed to the endpoint needs pre-processing to meet the size, type, and format requirements, and post-processing to show the predicted label. The triton_densenet_scoring.py uses the tritonclient.http library to communicate with the Triton inference server.

  1. To get the endpoint scoring uri, use the following command:

    scoring_uri=$(az ml online-endpoint show -n $ENDPOINT_NAME --query scoring_uri -o tsv)
    scoring_uri=${scoring_uri%/*}
    
  2. To get an authentication token, use the following command:

    auth_token=$(az ml online-endpoint get-credentials -n $ENDPOINT_NAME --query accessToken -o tsv)
    
  3. To score data with the endpoint, use the following command. It submits the image of a peacock (https://aka.ms/peacock-pic) to the endpoint:

    python $BASE_PATH/triton_densenet_scoring.py --base_url=$scoring_uri --token=$auth_token
    

    The response from the script is similar to the following text:

    Is server ready - True
    Is model ready - True
    /azureml-examples/cli/endpoints/online/triton/single-model/densenet_labels.txt
    84 : PEACOCK
    

Delete your endpoint and model

Once you're done with the endpoint, use the following command to delete it:

az ml online-endpoint delete -n $ENDPOINT_NAME --yes

Use the following command to delete your model:

az ml model delete --name $MODEL_NAME --version $MODEL_VERSION

Deploy using Azure Machine Learning studio

This section shows how you can deploy Triton to managed online endpoint using Azure Machine Learning studio.

  1. Register your model in Triton format using the following YAML and CLI command. The YAML uses a densenet-onnx model from https://github.com/Azure/azureml-examples/tree/main/cli/endpoints/online/triton/single-model

    create-triton-model.yaml

    name: densenet-onnx-model
    version: 1
    path: ./models
    type: triton_model​
    description: Registering my Triton format model.
    
    az ml model create -f create-triton-model.yaml
    

    The following screenshot shows how your registered model will look on the Models page of Azure Machine Learning studio.

    Screenshot showing Triton model format on Models page.

  2. From studio, select your workspace and then use either the endpoints or models page to create the endpoint deployment:

    1. From the Endpoints page, select Create.

      Screenshot showing create option on the Endpoints UI page.

    2. Provide a name and authentication type for the endpoint, and then select Next.

    3. When selecting a model, select the Triton model registered previously. Select Next to continue.

    4. When you select a model registered in Triton format, in the Environment step of the wizard, you don't need scoring script and environment.

      Screenshot showing no code and environment needed for Triton models

    5. Complete the wizard to deploy the model to the endpoint.

      Screenshot showing NCD review screen

Next steps

To learn more, review these articles: