google cloud platform using ml on the real-time decisions€¦ · python / java. machine learning...
TRANSCRIPT
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Real-Time Decisions Using ML on the Google Cloud Platform
Przemysław Pastuszka & Carlos GarciaQCon London7th March 2018
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How many of you are interested in machine
learning?
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but… how many of you are running real-time machine
learning in production?
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Who is Ocado?
Ocado is the world’s largest dedicated
online grocery retailer
We have 645,000 active shoppers
And 49,000 SKUs in our webshop
Three highly-automated fulfilment centres
263,000 orders a week ‘picked’
3 million routing calculations per second
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What Ocado Technology does
(1) Cloud and AI(2) Automation and robotics(3) Big Data (4) Web and app development(5) IoT
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Fraud: An ML journey
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But then… what is fraud?
• Mainly chargebacks
• Other types of fraud?
• Learn from the actual outcome
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Do I really need to do any ML?
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Know your target
• Do you need ML?
• What do you want to predict?
• How good are you at predicting that?
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Cost of mistakes
• False positives and false negatives
• How expensive are they?
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Start with heuristics
• Ask domain experts
• Derive rules from expert knowledge• “If more than 80% of order is alcohol, then classify as risky”
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Heuristics are not enough
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Motivations for Machine Learning
Data-driven
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Motivations for Machine Learning
Data-driven Fraudsters learn
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Motivations for Machine Learning
Data-driven Fraudsters learn
Customer patterns
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Motivations for Machine Learning
Data-driven Fraudsters learn
Business changesCustomer patterns
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Challenges
• Fraud (human) agents
• ML is affected by human decisions
• Unbalanced classes (fraud / not-fraud)
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What ML model do you choose?
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“With great power there must also come… great
responsibility”Spider-Man
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Criteria
Online vs batch predictions
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Criteria
Online vs batch predictions
Explainable predictions
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Challenge your explanations
“Why should I trust you?”2016, M. Tulio, S. Singh, C. Guestrin
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Criteria
Online vs batch predictions
Explainable predictions
Programming language
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Criteria
Online vs batch predictions
Explainable predictions
Cloud vs on-premiseProgramming
language
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Our ML choice
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Criteria
Online vs batch predictions
Explainable predictions
Cloud vs on-premiseProgramming
language
online preferable
cloudPython /
Java
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Machine Learning
EngineµService
Cloud Storage
Model
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Interesting alternatives
Amazon SageMaker
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Interesting alternatives
Amazon SageMaker
Google CloudMachine Learning
Engine
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Problem #1Not fast enough
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Data exploration cycle
State the hypothesis
Act
Validate
03
01 02
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Big Query
Validate your hypothesis - fast!
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Problem #2Data delivered too late
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µService
µService
µService
µService
Amazon Web Services
Google Cloud Platform
Big QueryKinesis
Data Flow
Apache Beam
+
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List<String> strings = ...strings.stream().collect( Collectors.groupingBy(
word -> word.charAt(0), Collectors.counting()));
PCollection<String> pipeline = ...pipeline .apply(MapElements.via(row -> KV.of(word.charAt(0), word))) .apply(GroupByKey.create()) .apply(Count.perKey())
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Apache Beam
ApacheApex
ApacheFlink
ApacheSpark
Google Dataflow
ApacheGearpump
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Problem #3Missing data
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Missing data
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Capture every change to the business state
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Training
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train(C1, … CN, O1, … ON, Y) = model
C1, … CN, O1, … ON - customer and order featuresC1- Average basket size for the customerO1- % of alcoholic items in current order...
Y - Fraud or not fraud
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Machine Learning
Engine
Model
FeaturesEventsC1…, O1, …
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Machine Learning
Engine
Model
FeaturesEventsSQL
Apache Airflow
C1…, O1, …
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Serving predictions
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train(C1, … CN, O1, … ON, Y) = modelmodel(C1, … CN, O1, … ON) = prediction
C1, … CN, O1, … ON - customer and order featuresC1- Average basket size for the customerO1- % of alcoholic items in current order...
Y - Fraud or not fraudprediction - Probability of current order being fraudulent
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Model
µService
O1, … ON Machine Learning
Engine
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Model
FeaturesEventsSQL
Apache Airflow
µService
Datastore
Custom App
ID: C1…
ID, O1, … C1…, O1, … Machine Learning
Engine
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Model
FeaturesEventsSQL
Apache Airflow
µService
Datastore
Custom App
ID: C1…
ID, O1, … C1…, O1, … Machine Learning
Engine
Training
Serving
C1…, O1, …
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Architecting for the future
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Machine Learning
Engine
Model
FeaturesEventsSQL
Apache AirflowTraining
µService
DatastoreServing
Custom App
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Know your target
Keep It Simple
Choose your model wisely
Google Cloud ML Engine for Neural Nets
Have data and tools ready
BigQuery is king
Unified architecture for training and serving predictions
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Thank you!