The following tutorial is available on the Wallaroo Github Repository.

Computer Vision Yolov8n Edge Deployment in Wallaroo

The Yolov8 computer vision model is used for fast recognition of objects in images. This tutorial demonstrates how to deploy a Yolov8n pre-trained model into a Wallaroo Ops server and perform inferences on it.

Wallaroo Ops Center provides the ability to publish Wallaroo pipelines to an Open Continer Initative (OCI) compliant registry, then deploy those pipelines on edge devices as Docker container or Kubernetes pods. See Wallaroo SDK Essentials Guide: Pipeline Edge Publication for full details.

For this tutorial, the helper module CVDemoUtils and WallarooUtils are used to transform a sample image into a pandas DataFrame. This DataFrame is then submitted to the Yolov8n model deployed in Wallaroo.

This demonstration follows these steps:

• In Wallaroo Ops:
  • Upload the Yolo8 model to Wallaroo Ops
  • Add the Yolo8 model as a Wallaroo pipeline step
  • Deploy the Wallaroo pipeline and allocate cluster resources to the pipeline
  • Perform sample inferences
  • Undeploy and return the resources to the cluster.
  • Publish the pipeline to the OCI registry configured in the Wallaroo Ops server.
• In a remote aka edge device:
  • Deploy the published pipeline as a Wallaroo Inference Server on an edge device through Docker.

References

• Wallaroo Workspaces: Workspaces are environments were users upload models, create pipelines and other artifacts. The workspace should be considered the fundamental area where work is done. Workspaces are shared with other users to give them access to the same models, pipelines, etc.
• Wallaroo Model Upload and Registration: ML Models are uploaded to Wallaroo through the SDK or the MLOps API to a workspace. ML models include default runtimes (ONNX, Python Step, and TensorFlow) that are run directly through the Wallaroo engine, and containerized runtimes (Hugging Face, PyTorch, etc) that are run through in a container through the Wallaroo engine.
• Wallaroo Pipelines: Pipelines are used to deploy models for inferencing. Each model is a pipeline step in a pipelines, where the inputs of the previous step are fed into the next. Pipeline steps can be ML models, Python scripts, or Custom Model (these contain necessary models and artifacts for running a model).
• Wallaroo SDK Essentials Guide: Pipeline Edge Publication: Details on publishing a Wallaroo pipeline to an OCI Registry and deploying it as a Wallaroo Server instance.

Data Scientist Steps

The following details the steps a Data Scientist performs in uploading and verifying the model in a Wallaroo Ops server.

Load Libraries

The first step is loading the required libraries including the Wallaroo Python module.

# Import Wallaroo Python SDK
import wallaroo
from wallaroo.object import EntityNotFoundError
from wallaroo.framework import Framework
from CVDemoUtils import CVDemo
from WallarooUtils import Util
cvDemo = CVDemo()
util = Util()

# used to display DataFrame information without truncating
from IPython.display import display
import pandas as pd
pd.set_option('display.max_colwidth', None)

Connect to the Wallaroo Instance through the User Interface

The next step is to connect to Wallaroo through the Wallaroo client. The Python library is included in the Wallaroo install and available through the Jupyter Hub interface provided with your Wallaroo environment.

This is accomplished using the wallaroo.Client() command, which provides a URL to grant the SDK permission to your specific Wallaroo environment. When displayed, enter the URL into a browser and confirm permissions. Store the connection into a variable that can be referenced later.

If logging into the Wallaroo instance through the internal JupyterHub service, use wl = wallaroo.Client(). For more information on Wallaroo Client settings, see the Client Connection guide.

wl = wallaroo.Client()

Create a New Workspace

We’ll use the SDK below to create our workspace , assign as our current workspace, then display all of the workspaces we have at the moment. We’ll also set up variables for our models and pipelines down the road, so we have one spot to change names to whatever fits your organization’s standards best.

To allow this tutorial to be run by multiple users in the same Wallaroo instance, a random 4 character prefix will be added to the workspace, pipeline, and model. Feel free to set suffix='' if this is not required.

model_name = 'yolov8n'
model_filename = './models/yolov8n.onnx'
pipeline_name = 'yolo8demonstration'
workspace_name = f'yolo8-edge-demonstration'

workspace = wl.get_workspace(name=workspace_name, create_if_not_exist=True)
wl.set_current_workspace(workspace)

{'name': 'yolo8-edge-demonstration', 'id': 16, 'archived': False, 'created_by': 'b030ff9c-41eb-49b4-afdf-2ccbecb6be5d', 'created_at': '2023-10-11T15:05:59.754216+00:00', 'models': [{'name': 'yolov8n', 'versions': 1, 'owner_id': '""', 'last_update_time': datetime.datetime(2023, 10, 11, 15, 6, 6, 98540, tzinfo=tzutc()), 'created_at': datetime.datetime(2023, 10, 11, 15, 6, 6, 98540, tzinfo=tzutc())}], 'pipelines': [{'name': 'yolo8demonstration', 'create_time': datetime.datetime(2023, 10, 11, 15, 6, 7, 64939, tzinfo=tzutc()), 'definition': '[]'}]}

Upload the Model

When a model is uploaded to a Wallaroo cluster, it is optimized and packaged to make it ready to run as part of a pipeline. In many times, the Wallaroo Server can natively run a model without any Python overhead. In other cases, such as a Python script, a custom Python environment will be automatically generated. This is comparable to the process of “containerizing” a model by adding a small HTTP server and other wrapping around it.

Our pretrained model is in ONNX format, which is specified in the framework parameter. For this model, the tensor fields are set to images to match the input parameters, and the batch configuration is set to single - only one record will be submitted at a time.

# Upload Retrained Yolo8 Model 
yolov8_model = (wl.upload_model(model_name, 
                               model_filename, 
                               framework=Framework.ONNX)
                               .configure(tensor_fields=['images'],
                                          batch_config="single"
                                          )
                )

Pipeline Deployment Configuration

For our pipeline we set the deployment configuration to only use 1 cpu and 1 GiB of RAM.

deployment_config = wallaroo.DeploymentConfigBuilder() \
                    .replica_count(1) \
                    .cpus(1) \
                    .memory("1Gi") \
                    .build()

Build and Deploy the Pipeline

Now we build our pipeline and set our Yolo8 model as a pipeline step, then deploy the pipeline using the deployment configuration above.

pipeline = wl.build_pipeline(pipeline_name) \
            .add_model_step(yolov8_model)        

pipeline.deploy(deployment_config=deployment_config)

Convert Image to DataFrame

The sample image dogbike.png was converted to a DataFrame using the cvDemo helper modules. The converted DataFrame is stored as ./data/dogbike.df.json to save time.

The code sample below demonstrates how to use this module to convert the sample image to a DataFrame.

# convert the image to a tensor

width, height = 640, 640
tensor1, resizedImage1 = cvDemo.loadImageAndResize('dogbike.png', width, height)
tensor1.flatten()

# add the tensor to a DataFrame and save the DataFrame in pandas record format
df = util.convert_data(tensor1,'images')
df.to_json("data.json", orient = 'records')

Inference Request

We submit the DataFrame to the pipeline using wallaroo.pipeline.infer, and store the results in the variable inf1. A copy of the dataframe is stored in the file ./data/dogbike.df.json.

width, height = 640, 480
tensor1, resizedImage1 = cvDemo.loadImageAndResize('./data/dogbike.png', width, height)

inf1 = pipeline.infer_from_file('./data/dogbike.df.json')

Display Bounding Boxes

Using our helper method cvDemo we’ll identify the objects detected in the photo and their bounding boxes. Only objects with a confidence threshold of 50% or more are shown.

confidence_thres = 0.50
iou_thres = 0.25

cvDemo.drawYolo8Boxes(inf1, resizedImage1, width, height, confidence_thres, iou_thres, draw=True)

  Score: 86.47% | Class: Dog | Bounding Box: [108, 250, 149, 356]
  Score: 81.13% | Class: Bicycle | Bounding Box: [97, 149, 375, 323]
  Score: 63.16% | Class: Car | Bounding Box: [390, 85, 186, 108]

array([[[ 34,  34,  34],
        [ 35,  35,  35],
        [ 33,  33,  33],
        ...,
        [ 33,  33,  33],
        [ 33,  33,  33],
        [ 35,  35,  35]],

       [[ 41,  41,  39],
        [ 42,  42,  40],
        [ 42,  42,  40],
        ...,
        [ 81,  91,  64],
        [ 80,  92,  63],
        [ 83,  90,  59]],

       [[ 59,  61,  53],
        [ 61,  62,  54],
        [ 61,  62,  54],
        ...,
        [193, 228, 136],
        [195, 236, 136],
        [203, 224, 122]],

       ...,

       [[159, 167, 178],
        [160, 166, 178],
        [160, 165, 177],
        ...,
        [126, 127, 121],
        [126, 125, 120],
        [127, 121, 117]],

       [[160, 168, 179],
        [157, 163, 175],
        [154, 159, 171],
        ...,
        [126, 127, 121],
        [128, 126, 121],
        [127, 119, 116]],

       [[156, 164, 175],
        [155, 162, 174],
        [152, 158, 170],
        ...,
        [127, 127, 121],
        [130, 126, 122],
        [128, 119, 116]]], dtype=uint8)

Inference Through Pipeline API

Another method of performing an inference using the pipeline’s deployment url.

Performing an inference through an API requires the following:

• The authentication token to authorize the connection to the pipeline.
• The pipeline’s inference URL.
• Inference data to sent to the pipeline - in JSON, DataFrame records format, or Apache Arrow.

Full details are available through the Wallaroo API Connection Guide on how retrieve an authorization token and perform inferences through the pipeline’s API.

For this demonstration we’ll submit the pandas record, request a pandas record as the return, and set the authorization header. The results will be stored in the file curl_response.df.

deploy_url = pipeline._deployment._url()

headers = wl.auth.auth_header()

headers['Content-Type']='application/json; format=pandas-records'
headers['Accept']='application/json; format=pandas-records'

!curl -X POST {deploy_url} \
    -H "Authorization:{headers['Authorization']}" \
    -H "Content-Type:application/json; format=pandas-records" \
    -H "Accept:application/json; format=pandas-records" \
    --data @./data/dogbike.df.json > curl_response.df

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 38.0M  100 22.9M  100 15.0M  4541k  2988k  0:00:05  0:00:05 --:--:-- 7920k

pipeline.undeploy()

Publish the Pipeline for Edge Deployment

It worked! For a demo, we’ll take working once as “tested”. So now that we’ve tested our pipeline, we are ready to publish it for edge deployment.

Publishing it means assembling all of the configuration files and model assets and pushing them to an Open Container Initiative (OCI) repository set in the Wallaroo instance as the Edge Registry service. DevOps engineers then retrieve that image and deploy it through Docker, Kubernetes, or similar deployments.

See Edge Deployment Registry Guide for details on adding an OCI Registry Service to Wallaroo as the Edge Deployment Registry.

This is done through the SDK command wallaroo.pipeline.publish(deployment_config) which has the following parameters and returns.

Publish a Pipeline Parameters

The publish method takes the following parameters. The containerized pipeline will be pushed to the Edge registry service with the model, pipeline configurations, and other artifacts needed to deploy the pipeline.

Publish a Pipeline Returns

Publish Example

We will now publish the pipeline to our Edge Deployment Registry with the pipeline.publish(deployment_config) command. deployment_config is an optional field that specifies the pipeline deployment. This can be overridden by the DevOps engineer during deployment.

pub = pipeline.publish(deployment_config)
pub

Waiting for pipeline publish... It may take up to 600 sec.
Pipeline is Publishing...Published.

List Published Pipeline

The method wallaroo.client.list_pipelines() shows a list of all pipelines in the Wallaroo instance, and includes the published field that indicates whether the pipeline was published to the registry (True), or has not yet been published (False).

wl.list_pipelines()

List Publishes from a Pipeline

All publishes created from a pipeline are displayed with the wallaroo.pipeline.publishes method. The pipeline_version_id is used to know what version of the pipeline was used in that specific publish. This allows for pipelines to be updated over time, and newer versions to be sent and tracked to the Edge Deployment Registry service.

List Publishes Parameters

N/A

List Publishes Returns

A List of the following fields:

pipeline.publishes()

DevOps - Pipeline Edge Deployment

Once a pipeline is deployed to the Edge Registry service, it can be deployed in environments such as Docker, Kubernetes, or similar container running services by a DevOps engineer.

Docker Deployment

First, the DevOps engineer must authenticate to the same OCI Registry service used for the Wallaroo Edge Deployment registry.

For more details, check with the documentation on your artifact service. The following are provided for the three major cloud services:

• Set up authentication for Docker
• Authenticate with an Azure container registry
• Authenticating Amazon ECR Repositories for Docker CLI with Credential Helper

For the deployment, the engine URL is specified with the following environmental variables:

• DEBUG (true|false): Whether to include debug output.
• OCI_REGISTRY: The URL of the registry service.
• CONFIG_CPUS: The number of CPUs to use.
• OCI_USERNAME: The edge registry username.
• OCI_PASSWORD: The edge registry password or token.
• PIPELINE_URL: The published pipeline URL.

Docker Deployment Example

Using our sample environment, here’s sample deployment using Docker with a computer vision ML model, the same used in the Wallaroo Use Case Tutorials Computer Vision: Retail tutorials.

For docker run commands, the persistent volume for storing session data is stored with -v ./data:/persist. Updated as required for your deployments.

docker run -p 8080:8080 \
    -v ./data:/persist \
    -e DEBUG=true -e OCI_REGISTRY={your registry server} \
    -e CONFIG_CPUS=4 \
    -e OCI_USERNAME=oauth2accesstoken \
    -e OCI_PASSWORD={registry token here} \
    -e PIPELINE_URL={your registry server}/pipelines/edge-cv-retail:bf70eaf7-8c11-4b46-b751-916a43b1a555 \
    {your registry server}/engine:v2023.3.0-main-3707

Docker Compose Deployment

For users who prefer to use docker compose, the following sample compose.yaml file is used to launch the Wallaroo Edge pipeline. This is the same used in the Wallaroo Use Case Tutorials Computer Vision: Retail tutorials. The session and other data is stored with the volumes entry to add a persistent volume.

services:
  engine:
    image: {Your Engine URL}
    ports:
      - 8080:8080
    volumes:
      - ./data:/persist
    environment:
      PIPELINE_URL: {Your Pipeline URL}
      OCI_REGISTRY: {Your Edge Registry URL}
      OCI_USERNAME:  {Your Registry Username}
      OCI_PASSWORD: {Your Token or Password}
      CONFIG_CPUS: 1

For example:

services:
  engine:
    image: sample-registry.com/engine:v2023.3.0-main-3707
    ports:
      - 8080:8080
    environment:
      PIPELINE_URL: sample-registry.com/pipelines/edge-cv-retail:bf70eaf7-8c11-4b46-b751-916a43b1a555
      OCI_REGISTRY: sample-registry.com
      OCI_USERNAME:  _json_key_base64
      OCI_PASSWORD: abc123
      CONFIG_CPUS: 1

Docker Compose Deployment Example

The deployment and undeployment is then just a simple docker compose up and docker compose down. The following shows an example of deploying the Wallaroo edge pipeline using docker compose.

docker compose up
[+] Running 1/1
 ✔ Container cv_data-engine-1  Recreated                                                                                                                                                                 0.5s
Attaching to cv_data-engine-1
cv_data-engine-1  | Wallaroo Engine - Standalone mode
cv_data-engine-1  | Login Succeeded
cv_data-engine-1  | Fetching manifest and config for pipeline: sample-registry.com/pipelines/edge-cv-retail:bf70eaf7-8c11-4b46-b751-916a43b1a555
cv_data-engine-1  | Fetching model layers
cv_data-engine-1  | digest: sha256:c6c8869645962e7711132a7e17aced2ac0f60dcdc2c7faa79b2de73847a87984
cv_data-engine-1  |   filename: c6c8869645962e7711132a7e17aced2ac0f60dcdc2c7faa79b2de73847a87984
cv_data-engine-1  |   name: resnet-50
cv_data-engine-1  |   type: model
cv_data-engine-1  |   runtime: onnx
cv_data-engine-1  |   version: 693e19b5-0dc7-4afb-9922-e3f7feefe66d
cv_data-engine-1  |
cv_data-engine-1  | Fetched
cv_data-engine-1  | Starting engine
cv_data-engine-1  | Looking for preexisting `yaml` files in //modelconfigs
cv_data-engine-1  | Looking for preexisting `yaml` files in //pipelines

Helm Deployment

Published pipelines can be deployed through the use of helm charts.

Helm deployments take up to two steps - the first step is in retrieving the required values.yaml and making updates to override.

1. Pull the helm charts from the published pipeline. The two fields are the Helm Chart URL and the Helm Chart version to specify the OCI . This typically takes the format of:

helm pull oci://{published.helm_chart_url} --version {published.helm_chart_version}

1. Extract the tgz file and copy the values.yaml and copy the values used to edit engine allocations, etc. The following are required for the deployment to run:

ociRegistry:
  registry: {your registry service}
  username:  {registry username here}
  password: {registry token here}

Store this into another file, suc as local-values.yaml.

1. Create the namespace to deploy the pipeline to. For example, the namespace wallaroo-edge-pipeline would be:

kubectl create -n wallaroo-edge-pipeline

1. Deploy the helm installation with helm install through one of the following options:

   1. Specify the tgz file that was downloaded and the local values file. For example:

      helm install --namespace {namespace} --values {local values file} {helm install name} {tgz path}
      

   2. Specify the expended directory from the downloaded tgz file.

      helm install --namespace {namespace} --values {local values file} {helm install name} {helm directory path}
      

   3. Specify the Helm Pipeline Helm Chart and the Pipeline Helm Version.

      helm install --namespace {namespace} --values {local values file} {helm install name} oci://{published.helm_chart_url} --version {published.helm_chart_version}
      

2. Once deployed, the DevOps engineer will have to forward the appropriate ports to the svc/engine-svc service in the specific pipeline. For example, using kubectl port-forward to the namespace ccfraud that would be:

   kubectl port-forward svc/engine-svc -n ccfraud01 8080 --address 0.0.0.0`
   

The following code segment generates a docker run template based on the previously published pipeline.

docker_deploy = f'''
docker run -p 8080:8080 \\
    -v ./data:/persist \\
    -e OCI_REGISTRY=$REGISTRYURL \\
    -e CONFIG_CPUS=4 \\
    -e OCI_USERNAME=$REGISTRYUSERNAME \\
    -e OCI_PASSWORD=$REGISTRYPASSWORD \\
    -e PIPELINE_URL={pub.pipeline_url} \\
    {pub.engine_url}
'''

print(docker_deploy)

docker run -p 8080:8080 \
    -e OCI_REGISTRY=$REGISTRYURL \
    -e CONFIG_CPUS=4 \
    -e OCI_USERNAME=$REGISTRYUSERNAME \
    -e OCI_PASSWORD=$REGISTRYPASSWORD \
    -e PIPELINE_URL=ghcr.io/wallaroolabs/doc-samples/pipelines/yolo8demonstration:4f05b506-2584-4eda-8c8d-54e6534b4bfb \
    ghcr.io/wallaroolabs/doc-samples/engines/proxy/wallaroo/ghcr.io/wallaroolabs/standalone-mini:v2023.3.0-3854

Edge Deployed Pipeline API Endpoints

Once deployed, we can check the pipelines and models available. We’ll use a curl command, but any HTTP based request will work the same way.

The endpoint /pipelines returns:

• id (String): The name of the pipeline.
• status (String): The status as either Running, or Error if there are any issues.

curl localhost:8080/pipelines
{"pipelines":[{"id":"yolo8demonstration","status":"Running"}]}

The following example uses the host localhost. Replace with your own host name of your Edge deployed pipeline.

!curl localhost:8080/pipelines

{"pipelines":[{"id":"yolo8demonstration","status":"Running"}]}

The endpoint /models returns a List of models with the following fields:

• name (String): The model name.
• sha (String): The sha hash value of the ML model.
• status (String): The status of either Running or Error if there are any issues.
• version (String): The model version. This matches the version designation used by Wallaroo to track model versions in UUID format.

{"models":[{"name":"yolov8n","sha":"3ed5cd199e0e6e419bd3d474cf74f2e378aacbf586e40f24d1f8c89c2c476a08","status":"Running","version":"7af40d06-d18f-4b3f-9dd3-0a15248f01c8"}]}

The following example uses the host localhost. Replace with your own host name of your Edge deployed pipeline.

!curl localhost:8080/models

{"models":[{"name":"yolov8n","sha":"3ed5cd199e0e6e419bd3d474cf74f2e378aacbf586e40f24d1f8c89c2c476a08","status":"Running","version":"7af40d06-d18f-4b3f-9dd3-0a15248f01c8"}]}

Edge Inference Endpoint

The inference endpoint takes the following pattern:

• /pipelines/{pipeline-name}: The pipeline-name is the same as returned from the /pipelines endpoint as id.

Wallaroo inference endpoint URLs accept the following data inputs through the Content-Type header:

• Content-Type: application/vnd.apache.arrow.file: For Apache Arrow tables.
• Content-Type: application/json; format=pandas-records: For pandas DataFrame in record format.

Once deployed, we can perform an inference through the deployment URL.

The endpoint returns Content-Type: application/json; format=pandas-records by default with the following fields:

• check_failures (List[Integer]): Whether any validation checks were triggered. For more information, see Wallaroo SDK Essentials Guide: Pipeline Management: Anomaly Testing.
• elapsed (List[Integer]): A list of time in nanoseconds for:
  • [0] The time to serialize the input.
  • [1…n] How long each step took.
• model_name (String): The name of the model used.
• model_version (String): The version of the model in UUID format.
• original_data: The original input data. Returns null if the input may be too long for a proper return.
• outputs (List): The outputs of the inference result separated by data type, where each data type includes:
  • data: The returned values.
  • dim (List[Integer]): The dimension shape returned.
  • v (Integer): The vector shape of the data.
• pipeline_name (String): The name of the pipeline.
• shadow_data: Any shadow deployed data inferences in the same format as outputs.
• time (Integer): The time since UNIX epoch.

Once deployed, we can perform an inference through the deployment URL. We’ll assume we’re running the inference request through the localhost and submitting the local file ./data/dogbike.df.json. Note that our inference endpoint is pipelines/yolo8demonstration - the same as our pipeline name.

The following example demonstrates sending an inference request to the edge deployed pipeline and storing the results in a pandas DataFrame in record format. The results can then be exported to other processes to render the detected images or other use cases.

!curl -X POST localhost:8080/pipelines/yolo8demonstration \
    -H "Content-Type: application/json; format=pandas-records" \
    --data @./data/dogbike.df.json > edge-results.df.json

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0

100 28.7M  100 13.6M  100 15.0M  14.2M  15.7M --:--:-- --:--:-- --:--:-- 30.3M