Hivemall meets Digdag @Hackertackle 2018-02-17

Hivemall meets DigDag
Machine Learning Pipeline by SQL queries
Research Engineer, Treasure Data
Makoto YUI @myui
@ApacheHivemall
12018/2/17 HackerTackle

Ø 2015.04~ Research Engineer at Treasure Data, Inc.
• My mission is developing ML-as-a-Service in a Hadoop-as-a-service company
Ø 2010.04-2015.03 Senior Researcher at National Institute of Advanced
Industrial Science and Technology, Japan.
• Developed Hivemall as a personal research project
Ø 2009.03 Ph.D. in Computer Science from NAIST
• Majored in Parallel Data Processing, not ML then
Ø Visiting scholar in CWI, Amsterdam and Univ. Edinburgh
About me …
2018/2/17 HackerTackle 2
•
•
let $succ := function($x) { $x+1 } return (for $i in (10,20,30) return $succ($i))
slideshare.net/myui/icde2010-nbgclock

About me …
ü Ocaml (for/let, type inference)
ü Lisp (every object is a sequence/atomization)
ü XPath
influenced by

We Open-source! TD invented ..
Streaming log collector Bulk data import/export Efficient binary serialization
Machine learning on Hadoop Workflow EngineEmbedded version of Fluentd

Plan of the talk
1. Introduction to Hivemall
2. ML workflow using Digdag

Hivemall entered Apache Incubator
on Sept 13, 2016
Since then, we invited 3 contributors as new committers (a
committer has been voted as PPMC). Currently, we are working
toward the first Apache release (v0.5.0).
hivemall.incubator.apache.org

Industry use cases of Hivemall
Ø T-mobile.au
Ø Klout – influencer marketing
bit.ly/klout-hivemall
bit.ly/2whJCQj
Ø Subaru
8
https://www.treasuredata.co.jp/customers/subaru/

Ø CTR prediction of Ad click logs
• Freakout Inc., Fan communication, and more
• Replaced Spark MLlib w/ Hivemall at company X
9
http://www.slideshare.net/masakazusano75/sano-hmm-20150512

Minne (Japanese version of Etsy.com) uses Hivemall for Item
recommendation
https://speakerdeck.com/monochromegane/pepabo-minne-matrix-factorization-in-hivemall

11
ØGender prediction of Ad click logs
•Scaleout Inc. and Fan commutations
http://eventdots.jp/eventreport/458208

12
Ø Value prediction of Real estates
•Livesense
http://www.slideshare.net/y-ken/real-estate-tech-with-hivemall

13
ØChurn Detection
•OISIX
http://www.slideshare.net/TaisukeFukawa/hivemall-meetup-vol2-oisix
Web
Mobile
User attributes
User action log
Claim histories
Referrers
Services used
Direct countermeasure
In-direct countermeasure
Giving points Call to care
Guide to SuccessUI Change
Data used for Prediction
Find customers likely to
churn using Hivemall
Feedback
Loop
Customers
likely to leave

What is Apache Hivemall
Scalable machine learning library built
as a collection of Hive UDFs
Multi/Cross
platform
VersatileScalableEase-of-use

Hivemall is easy and scalable …
ML made easy for SQL developers
Born to be parallel and scalable
Ease-of-use
Scalable
100+ lines
of code
CREATE TABLE lr_model AS
SELECT
feature, -- reducers perform model averaging in parallel
avg(weight) as weight
FROM (
SELECT logress(features,label,..) as (feature,weight)
FROM train
) t -- map-only task
GROUP BY feature; -- shuffled to reducers
This query automatically runs in parallel on Hadoop

Hivemall is a multi/cross-platform ML library
HiveQL SparkSQL/Dataframe API Pig Latin
Hivemall is Multi/Cross platform ..
Multi/Cross
platform
prediction models built by Hive can be used from Spark, and conversely,
prediction models build by Spark can be used from Hive

Hadoop HDFS
MapReduce
(MRv1)
Hivemall
Apache YARN
Apache Tez
DAG processing
Machine Learning
Query Processing
Parallel Data
Processing Framework
Resource Management
Distributed File System
Cloud Storage
SparkSQL
Apache Spark
MESOS
Hive Pig
MLlib
Hivemall’s Technology Stack
Amazon S3

Hivemall on Apache Hive

Hivemall on Apache Spark Dataframe

Hivemall on SparkSQL

Hivemall on Apache Pig

Online Prediction by Apache Streaming

23
Generic Classifier/Regressor
OLD Style New Style from v0.5.0

24
•Squared Loss
•Quantile Loss
•Epsilon Insensitive Loss
•Squared Epsilon Insensitive
Loss
•Huber Loss
Generic Classifier/Regressor
Available Loss functions
•HingeLoss
•LogLoss (synonym: logistic)
•SquaredHingeLoss
•ModifiedHuberLoss
• L1
• L2
• ElasticNet
• RDA
Other options
For Binary Classification:
For Regression:
• SGD
• AdaGrad
• AdaDelta
• ADAM
Optimizer
• Iteration support
• mini-batch
• Early stopping
Regularization

Versatile
Hivemall is a Versatile library ..
ü Not only for Machine Learning
ü provides a bunch of generic utility functions
Each organization has own sets of
UDFs for data preprocessing
Don’t Repeat Yourself!
Don’t Repeat Yourself!

Hivemall generic functions
Array and Map Bit and compress String and NLP
Brickhouse UDFs are merged in v0.5.2 release.
We welcome contributing your generic UDFs to Hivemall
Geo Spatial
Top-k processing
> TF/IDF
> TILE
> MAP_URL

student class score
1 b 70
2 a 80
3 a 90
4 b 50
5 a 70
6 b 60
Top-k query processing
List top-2 students for each class
SELECT * FROM (
SELECT
*,
rank() over (partition by class order by score desc)
as rank
FROM table
) t
WHERE rank <= 2
RANK over() query does not finishes in 24 hours L
where 20 million MOOCs classes and avg 1,000 students in each classes
27

student class score
1 b 70
2 a 80
3 a 90
4 b 50
5 a 70
6 b 60
Top-k query processing
List top-2 students for each class
SELECT
each_top_k(
2, class, score,
class, student
) as (rank, score, class, student)
FROM (
SELECT * FROM table
DISTRIBUTE BY class SORT BY class
) t
EACH_TOP_K finishes in 2 hours J
28

Map tiling functions

Tile(lat,lon,zoom)
= xtile(lon,zoom) + ytile(lat,zoom) * 2^n
Map tiling functions
Zoom=10
Zoom=15

31
SELECT count(distinct id) FROM data
More useful functions (Sketch, NLP)
SELECT approx_count_distinct(id) FROM data
select tokenize_ja(“ ",
"normal", null, null, "https://s3.amazonaws.com/td-
hivemall/dist/kuromoji-user-dict-neologd.csv.gz");
[“ ”, "," "," "]

List of Supported Algorithms
Classification
✓ Perceptron
✓ Passive Aggressive (PA, PA1, PA2)
✓ Confidence Weighted (CW)
✓ Adaptive Regularization of Weight
Vectors (AROW)
✓ Soft Confidence Weighted (SCW)
✓ AdaGrad+RDA
✓ Factorization Machines
✓ RandomForest Classification
Regression
✓Logistic Regression (SGD)
✓AdaGrad (logistic loss)
✓AdaDELTA (logistic loss)
✓PA Regression
✓AROW Regression
✓Factorization Machines
✓RandomForest Regression
SCW is a good first choice
Try RandomForest if SCW does not
work
Logistic regression is good for getting a
probability of a positive class
Factorization Machines is good where
features are sparse and categorical ones

RandomForest in Hivemall
Ensemble of Decision Trees

Training of RandomForest
34
Sparse Vector Input (Libsvm format) is
supported since v0.5.0 in addition Dense
Vector!

Prediction of RandomForest

36
Decision Tree Visualization

37
Decision Tree Visualization

38
SELECT train_xgboost_classifier(features, label) as (model_id, model)
FROM training_data
XGBoost support in Hivemall (beta version)
SELECT rowed, AVG(predicted) as predicted
FROM (
-- predict with each model
SELECT xgboost_predict(rowid, features, model_id, model) AS (rowid, predicted)
-- join each test record with each model
FROM xgboost_models CROSS JOIN test_data_with_id
) t
GROUP BY rowid;

Supported Algorithms for Recommendation
K-Nearest Neighbor
✓ Minhash and b-Bit Minhash
(LSH variant)
✓ Similarity Search on Vector Space
(Euclid/Cosine/Jaccard/Angular)
✓ DIMSUM (Cosine similarity)
Matrix Completion
✓ Matrix Factorization
✓ Factorization Machines
(regression)
each_top_k function of Hivemall is useful for
recommending top-k items

Other Supported Algorithms
Feature Engineering
✓Feature Hashing
✓Feature Scaling
(normalization, z-score)
✓ Feature Binning
✓ TF-IDF vectorizer
✓ Polynomial Expansion
✓ Amplifier
NLP
✓Basic Englist text Tokenizer
✓Japanese Tokenizer
Evaluation metrics
✓AUC, nDCG, logloss, precision
recall@K, and etc

Evaluation Metrics

Other Supported Features
Anomaly Detection
✓Local Outlier Factor (LoF)
✓ChangeFinder
Clustering / Topic models
✓Online mini-batch LDA
✓Online mini-batch PLSA
Change Point Detection
✓ChangeFinder
✓Singular Spectrum
Transformation

Efficient algorithm for finding change point and outliers from
time-series data
J. Takeuchi and K. Yamanishi, A Unifying Framework for Detecting Outliers and Change Points from Time Series, IEEE transactions on
Knowledge and Data Engineering, pp.482-492, 2006.
Anomaly/Change-point Detection by ChangeFinder

Take this…

…and do this!

Efficient algorithm for finding change point and outliers from
timeseries data
J. Takeuchi and K. Yamanishi, A Unifying Framework for Detecting Outliers and Change Points from Time Series, IEEE transactions on
Knowledge and Data Engineering, pp.482-492, 2006.

ü Word2Vec support
ü Multi-class Logistic Regression
ü Field-aware Factorization Machines
ü SLIM recommendation
ü More efficient XGBoost support
ü LightGBM support
ü DecisionTree prediction tracing
ü Gradient Boosting
Future work for v0.5.2 and later
47
PR#91
PR#116
PR#58
PR#111

48
ML workflows often be really complex…

Real-world ML pipelines (could be more complex)
Join
Extract Feature
Datasource
#1
Datasource
#2
Datasource
#3
Extract Feature
Feature Scaling
Feature Hashing
Feature Engineering
Feature Selection
Train by
Logistic Regression
Train by
RandomForest
Train by
Factorization Machines
Ensemble
Evaluate
Predict

Hivemall Digdag

Technology Trends for 2017
https://www.thoughtworks.com/radar

Why Digdag?
Ø Manage workflows by codes (simple YAML syntax)
Ø REST API endpoints
Ø Parallel/Sequential execution
Ø SLA, error notification
Ø Secrets Managing
Ø Docker support
Ø TD, EMR, Bigquery/Slack operators
Ø Embedded Javascript engine
Programmer Friendly, Revision management
Plugin scheme for defining custom operator

Digdag features
SLA and error handling Nestable, Parallel/Sequential Execution
Embedded Javascript engine

Machine Learning Workflow using Digdag

Use case: CTR/CVR prediction

Workflow execution timeline
DEMO

Conclusion and Takeaway
Hivemall is a multi/cross-platform ML library
providing a collection of machine learning algorithms as Hive UDFs/UDTFs
The first Apache release (v0.5.0) will appear soon!
We welcome your contributions to Apache Hivemall J
Digdag is a great workflow engine for managing complex ML pipelines

Any feature request or questions?

Hivemall meets Digdag @Hackertackle 2018-02-17

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Hivemall meets Digdag @Hackertackle 2018-02-17