Machine Learning/LiftWing

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Lift Wing

A scalable machine learning model serving infrastructure on Kubernetes using KServe.

Stack

Software Version
Kubernetes v1.16.5
Istio v1.9.5
Knative v0.18.1
KServe v0.8.0

Istio

Istio is a service-mesh where we can run our ML-services. It is installed using the istioctl package, which has been added to the WMF APT repository (Debian buster). See packages, we are currently running Istio 1.9.5 (istioctl: 1.9.5-1)

Knative

We use Knative Serving for running serverless containers on Kubernetes using Istio. It also allows for various deployment strategies like canary, blue-green, A/B tests, etc.

Charts

Images

KServe

We use KServe for its custom InferenceService resource. It enables us to expose our ML models as asynchronous micro-services.

Charts

Images

Hosts

eqiad

  • ml-serve1001-4

codfw

  • ml-serve2001-4
  • ml-staging200[12]

Components

Monitoring

Serving

We host our Machine Learning models as Inference Services (isvcs), which are asynchronous micro-services that can transform raw feature data and make predictions. Each inference service has production images that are published in the WMF Docker Registry via the Deployment Pipeline. These images are then used for an isvc configuration in our ml-services helmfile in the operations/deployment-charts repo.

Storage

We store model binary files in Swift, which is an open-source s3-compatible object store that is widely-used across the WMF. The model files are downloaded by the storage-initializer (init:container) when an Inference Service pod is created. The storage-initializer then mounts the model binary in the pod at /mnt/models/ and can be loaded by the predictor container.

Development

We are developing inference services with Docker and testing on the ML Sandbox using our own WMF KServe images & charts.

We previously used multiple sandbox clusters running MiniKF.

Services

We are serving ML models as Inference Services, which are containerized applications. The code is currently hosted on Gerrit.

Gerrit mono-repo: https://gerrit.wikimedia.org/r/plugins/gitiles/machinelearning/liftwing/inference-services

Github mirror: https://github.com/wikimedia/machinelearning-liftwing-inference-services

Current Inference Services

  • Revscoring models (migrated from ORES)
Model Type Model Name Kubernetes Namespace Docker Image
articlequality enwiki-articlequality, euwiki-articlequality, fawiki-articlequality, frwiki-articlequality, glwiki-articlequality, nlwiki-articlequality, ptwiki-articlequality, ruwiki-articlequality, svwiki-articlequality, trwiki-articlequality, ukwiki-articlequality, wikidatawiki-itemquality revscoring-articlequality revscoring
draftquality enwiki-draftquality, ptwiki-draftquality revscoring-draftquality
damaging arwiki-damaging, bswiki-damaging, cawiki-damaging, cswiki-damaging, dewiki-damaging, enwiki-damaging, eswikibooks-damaging, eswiki-damaging, eswikiquote-damaging, etwiki-damaging, fawiki-damaging, fiwiki-damaging, frwiki-damaging, hewiki-damaging, hiwiki-damaging, huwiki-damaging, itwiki-damaging, jawiki-damaging, kowiki-damaging, lvwiki-damaging, nlwiki-damaging, nowiki-damaging, plwiki-damaging, ptwiki-damaging, rowiki-damaging, ruwiki-damaging, sqwiki-damaging, srwiki-damaging, svwiki-damaging, ukwiki-damaging, wikidatawiki-damaging, zhwiki-damaging revscoring-editquality-damaging
goodfaith arwiki-goodfaith, bswiki-goodfaith, cawiki-goodfaith, cswiki-goodfaith, dewiki-goodfaith, enwiki-goodfaith, eswikibooks-goodfaith, eswiki-goodfaith, eswikiquote-goodfaith, etwiki-goodfaith, fawiki-goodfaith, fiwiki-goodfaith, frwiki-goodfaith, hewiki-goodfaith, hiwiki-goodfaith, huwiki-goodfaith, itwiki-goodfaith, jawiki-goodfaith, kowiki-goodfaith, lvwiki-goodfaith, nlwiki-goodfaith, nowiki-goodfaith, plwiki-goodfaith, ptwiki-goodfaith, rowiki-goodfaith, ruwiki-goodfaith, sqwiki-goodfaith, srwiki-goodfaith, svwiki-goodfaith, ukwiki-goodfaith, wikidatawiki-goodfaith, zhwiki-goodfaith revscoring-editquality-goodfaith
reverted bnwiki-reverted, elwiki-reverted, enwiktionary-reverted, glwiki-reverted, hrwiki-reverted, idwiki-reverted, iswiki-reverted, tawiki-reverted, viwiki-reverted revscoring-editquality-reverted
articletopic arwiki-articletopic, cswiki-articletopic, enwiki-articletopic, euwiki-articletopic, huwiki-articletopic, hywiki-articletopic, kowiki-articletopic, srwiki-articletopic, ukwiki-articletopic, viwiki-articletopic, wikidatawiki-itemtopic revscoring-articletopic
drafttopic arwiki-drafttopic, cswiki-drafttopic, enwiki-drafttopic, euwiki-drafttopic, huwiki-drafttopic, hywiki-drafttopic, kowiki-drafttopic, srwiki-drafttopic, ukwiki-drafttopic, viwiki-drafttopic revscoring-drafttopic
  • Language agnostic models
Model Name Kubernetes Namespace Docker Image Model Card
outlink-topic-model articletopic-outlink outlink, outlink-transformer Language_agnostic_link-based_article_topic_model_card
revert-risk-model experimental revertrisk

Usage

Internal endpoints

Once an InferenceService is deployed, it'll become available internally via

  • https://inference.svc.codfw.wmnet:30443/v1/models/{MODEL_NAME}:predict (codfw)
  • https://inference.svc.eqiad.wmnet:30443/v1/models/{MODEL_NAME}:predict (eqiad)
  • https://inference.discovery.wmnet:30443/v1/models/{MODEL_NAME}:predict (both)
  • https://inference-staging.svc.codfw.wmnet:30443/v1/models/{MODEL_NAME}:predict (staging)

with the HTTP Host header: {MODEL_NAME}.{KUBERNETES_NAMESPACE}.wikimedia.org

You can find {MODEL_NAME} and {KUBERNETES_NAMESPACE} in the tables in the previous section.

Note that the revscoring model group has its own model for each supported wiki, so the {MODEL_NAME} combines a wiki code and its model type i.e. {wiki_code}wiki-{model_type}. For example, enwiki-articlequality, arwiki-damaging, bnwiki-reverted, eswikibookswiki-goodfaith.

via Curl

The way to query enwiki-goodfaith model via curl:

aikochou@stat1004:~$ cat input.json 
{ "rev_id": 1083325118 }

aikochou@stat1004:~$ curl "https://inference.discovery.wmnet:30443/v1/models/enwiki-goodfaith:predict" -X POST -d @input.json -i -H "Host: enwiki-goodfaith.revscoring-editquality-goodfaith.wikimedia.org" --http1.1
HTTP/1.1 200 OK
content-length: 209
content-type: application/json; charset=UTF-8
date: Mon, 31 Oct 2022 16:51:54 GMT
server: istio-envoy
x-envoy-upstream-service-time: 361

{"enwiki": {"models": {"goodfaith": {"version": "0.5.1"}}, "scores": {"1083325118": {"goodfaith": {"score": {"prediction": true, "probability": {"false": 0.033641298577500645, "true": 0.9663587014224994}}}}}}}

If you get error curl: (60) SSL certificate problem: unable to get local issuer certificate, using

  • -k to ignore this error (like python requests verify=false), or
  • --cacert /etc/ssl/certs/wmf-ca-certificates.crt to add the CA certificate.

If you get error curl: (56) Received HTTP code 403 from proxy after CONNECT, try with

  • unset https_proxy to unset your http proxy environment variables.

via Python

The way to query outlink-topic-model via python:

import os
import json
import requests

os.environ['REQUESTS_CA_BUNDLE'] = "/etc/ssl/certs/wmf-ca-certificates.crt"

inference_url = 'https://inference.discovery.wmnet:30443/v1/models/outlink-topic-model:predict'
headers = {
    'Host': 'outlink-topic-model.articletopic-outlink.wikimedia.org',
    'Content-Type': 'application/x-www-form-urlencoded',
}
data = {"lang": "en", "page_title": "Wings of Fire (novel series)"}

response = requests.post(inference_url, headers=headers, data=json.dumps(data))

print(response.text)

If you get an error message:

requests.exceptions.ProxyError: HTTPSConnectionPool(host='inference.discovery.wmnet', port=30443): Max retries exceeded with url: /v1/models/outlink-topic-model:predict (Caused by ProxyError('Cannot connect to proxy.', OSError('Tunnel connection failed: 403 Forbidden')))

Try with unset https_proxy and run the script again.

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