Event-driven Model Retraining on Google Cloud Eventarc

Question

Pulumi · Accepted Answer

Event-driven architectures are commonly used to automate workflows, responding to changes in a system by executing specified processes. In the context of machine learning (ML), model retraining can be triggered by specific events to ensure that models remain accurate as new data becomes available. This can be vital for maintaining the performance of ML applications without manual intervention.

For event-driven model retraining, you would typically need:

A way to detect events that signal the need for model retraining.
A mechanism for triggering a retraining pipeline or workflow.
A system to replace the existing model with the retrained model.

On Google Cloud, Eventarc is a service that facilitates event-driven architectures by routing events to trigger actions in various Google Cloud services. By deploying a Cloud Run service or a workflow, we can create a pipeline for retraining machine learning models based on incoming events.

Let's construct an example of such an architecture using Pulumi, which will:

Create a Trigger to detect a specific event (like a file upload to a storage bucket signaling new data).
Route this event to a service, such as Cloud Run, which kicks off the model training job.
The trained model can then be updated automatically in the ML Engine.

Here's a Pulumi program in Python to set up an Eventarc Trigger that starts a model retraining process on Google Cloud when a specified event occurs:

import pulumi
import pulumi_gcp as gcp

# First, you need to set up a Google Cloud Storage bucket where your datasets will be stored.
data_bucket = gcp.storage.Bucket("data-bucket")

# Assuming you have a Cloud Run service that handles the retraining.
# The service URL would be something like https://<service_name>-<project_region>-run.app
cloud_run_service_name = "model-retraining-service"

# Set up Eventarc Trigger to watch for new objects in the data bucket
# and send events to the Cloud Run service for model retraining.
eventarc_trigger = gcp.eventarc.Trigger("model-retraining-trigger",
    event_filters=[
        gcp.eventarc.TriggerEventFilterArgs(
            attribute="type",
            value="google.cloud.storage.object.v1.finalized"
        ),
        gcp.eventarc.TriggerEventFilterArgs(
            attribute="bucket",
            value=data_bucket.name
        )
    ],
    destination=gcp.eventarc.TriggerDestinationArgs(
        cloud_run_service=gcp.eventarc.TriggerDestinationCloudRunServiceArgs(
            service=cloud_run_service_name
        )
    ),
    service_account="service-account-for-triggering-events@<your-project-id>.iam.gserviceaccount.com"  # Replace with your service account
)

pulumi.export('eventarc_trigger_name', eventarc_trigger.name)

In this program, we:

Define a Cloud Storage bucket where the events triggering the retraining pipeline will originate.
Assume that a Cloud Run service exists, which knows how to initiate the retraining process.
Create an Eventarc Trigger that listens for the object.finalize event, which occurs when a new object is created in a bucket.
Specify our Cloud Run service as the destination for the event.
Provide a service account that the Eventarc Trigger will use to authenticate and authorize the event delivery.

The pulumi.export function is used to output the Eventarc Trigger name so that we can reference it later, perhaps in logging or for debugging purposes.

Please replace <service_name>, <project_region>, and <your-project-id> with appropriate values corresponding to your Cloud Run service and Google Cloud project details. Also, make sure the Cloud Run service you reference has permissions to start model retraining jobs in your environment.

Remember to run pulumi up to deploy this infrastructure once you have set up your Pulumi and Google Cloud configurations.