OpenMLN E T W O R K E D M A C H I N E L E A R N I N G

F O R A L G O R I T H M S E L E C T I O N A N D O P T I M I S A T I O N

J O A Q U I N VA N S C H O R E N , T U E I N D H O V E N , 2 0 1 5

Meta-learning:

• Learn from experience how to select + optimize learning algorithms + workflows

Requires:

• Large amounts of real datasets

• Wide range of state-of-the-art algorithms

• Huge amounts of experimentation: explore how algorithms/params behave on many kinds of data

Millions of real, open datasets are generated • Drug activity, gene expressions, astronomical observations, text,…

Extensive toolboxes exist to analyse data • MLR, SKLearn, RapidMiner, KNIME, WEKA, AmazonML, AzureML,…

Massive amounts of experiments are run, most of this information is lost forever (in people’s heads) • No learning across people, labs, fields • Start from scratch, slows research and innovation

Let’s connect machine learning environments to network, so that we can organize, learn from experience

Connect minds, collaborate globally in real time

Train algorithms to automate data science

F R I C T I O N L E S S , N E T W O R K E D M A C H I N E L E A R N I N G

Easy to use: Integrated in ML environments. Automated, reproducible sharingOrganized data: Experiments connected to data, code, people anywhereEasy to contribute: Post single dataset, algorithm, experiment, commentReward structure*: Build reputation and trust (e-citations, social interaction)

OpenML

Data (ARFF) uploaded or referenced, versioned analysed, characterized, organised online

analysed, characterized, organised online

Tasks contain data, goals, procedures. Readable by tools, automates experimentation

Train-test splits

Evaluation measure

Results organized online: realtime overview

Results organized online: realtime overview

Train-test splits

Evaluation measure

Flows (code) from various tools, versioned.Integrations + APIs (REST, Java, R, Python,…)

Integrations + APIs (REST, Java, R, Python,…)

reproducible, linked to data, flows and authorsExperiments auto-uploaded, evaluated online

Experiments auto-uploaded, evaluated online

ExploreReuseShare

• Search by keywords or properties

• Filters

• Tagging

Data

• Wiki-like descriptions

• Analysis and visualisation of features

Data

• Wiki-like descriptions

• Analysis and visualisation of features

• Auto-calculation of large range of meta-features

Data

• Simple: Number/perc/log of instances, classes, features, dimensionality, NAs, …

• Statistical: Default acc, Min/max/mean distinct values, skewness, kurtosis, stdev, mutual information, …

• Information-theoretic: Entropy (class, num/nom feats), signal-noise ratio,…

• Landmarkers (AUC, ErrRate, Kappa): Decision stumps, Naive Bayes, kNN, RandomTree, J48(pruned), JRip, NBTree, lin.SVM, …

• Subsampling landmarkers (partial learning curves)

• Streaming landmarkers: Evaluations in previous window, previous best, per-algorithm significant win/loss

• Change detectors: HoeffdingAdwin, HoeffdingDDM

• Domain specific meta-features (e.g. molecular descriptors)

• Many not included yet

Meta-features (120+)

• Example: Classification on click prediction dataset, using 10-fold CV and AUC

• People submit results (e.g. predictions)

• Server-side evaluation (many measures)

• All results organized online, per algorithm, parameter setting

• Online visualizations: every dot is a run plotted by score

Tasks

• Leaderboards visualize progress over time: who delivered breakthroughs when, who built on top of previous solutions

• Collaborative: all code and data available, learn from others

• Real-time: clear who submitted first, others can improve immediately

Classroom challenges

• All results obtained with same flow organised online

• Results linked to data sets, parameter settings -> trends/comparisons

• Visualisations (dots are models, ranked by score, colored by parameters)

• Detailed run info

• Author, data, flow, parameter settings, result files, …

• Evaluation details (e.g., results per sample)

REST API (new) Requires OpenML accountPredictive URLs

R API Idem for Java, Python Tutorial: http://www.openml.org/guide

List datasets List tasks

List flowsList runs and results (soon)

Share

Explore

Reuse

Website1) Search, 2) Table view 3) CVS export*

R API Idem for Java, Python Tutorial: http://www.openml.org/guide

Download datasets Download tasks

Download flows

R API

Download run

Download run with predictions

Idem for Java, Python Tutorial: http://www.openml.org/guide

ReuseExplore

Share

WEKAOpenML extension in plugin manager

MOA

RapidMiner: 3 new operators

R API

Run a task (with mlr):

R API

Run a task (with mlr):

And upload:

Studies (e-papers) - Online counterpart of a paper, linkable- Add data, code, experiments (new or old)- Public or shared within circle

Circles Create collaborations with trusted researchersShare results within team prior to publication

Altmetrics - Measure real impact of your work - Reuse, downloads, likes of data, code, projects,…- Online reputation (more sharing)

Online collaboration (soon)

OpenML Community

Jan-Jun 2015

Used all over the world400 7-day, 1700 30-day active users, growing1000s of datasets, flows, 450000+ runs

Opportunities for automated algorithms selection + configuration• Many datasets, flows, experiments: much larger meta-learning

studies than possible before• More meta-features, better meta-models• Meta-data to speed up algorithm configuration, learn over time• APIs: Algorithm selection and configuration can be built on top

of OpenML, reusing and sharing data

OpenML in drug discovery

ChEMBL databaseSM

ILEs'

Molecular'proper0es'

(e.g.'MW,'LogP)'

Fingerprints'(e.g.'FP2,'FP3,'FP4,'MACSS)'

MW #LogP #TPSA #b1 #b2 #b3 #b4 #b5 #b6 #b7 #b8 #b9#!!

377.435 !3.883 !77.85 !1 !1 !0 !0 !0 !0 !0 !0 !0 !!341.361 !3.411 !74.73 !1 !1 !0 !1 !0 !0 !0 !0 !0 !…!197.188 !-2.089 !103.78 !1 !1 !0 !1 !0 !0 !0 !1 !0 !!346.813 !4.705 !50.70 !1 !0 !0 !1 !0 !0 !0 !0 !0!

! ! ! ! ! ! !.!! ! ! ! ! ! !: !!

10.000+ regression datasets

1.4M compounds,10k proteins, 12,8M activities

Predict which compounds (drugs) will inhibit certain proteins (and hence viruses, parasites,…)

2750 targets have >10 compounds, x 4 fingerprints

OpenML in drug discovery

cforest

ctree

earth

fnn

gbm

glmnetlassolmnnetpcrplsr

rforest

ridge

rtree

ECFP4_1024* FCFP4_1024* ECFP6_1024+ FCFP6_1024*

0.697* 0.427* 0.725+ 0.627*

|msdfeat< 0.1729

mutualinfo< 0.7182

skewresp< 0.3315

nentropyfeat< 1.926

netcharge1>=0.9999

netcharge3< 13.85

hydphob21< −0.09666

glmnet

fnn pcr

rforest

ridge rforest

rforest ridge

Predict best algorithm with meta-models

MW #LogP #TPSA #b1 #b2 #b3 #b4 #b5 #b6 #b7 #b8 #b9#!!

377.435 !3.883 !77.85 !1 !1 !0 !0 !0 !0 !0 !0 !0 !!341.361 !3.411 !74.73 !1 !1 !0 !1 !0 !0 !0 !0 !0 !…!197.188 !-2.089 !103.78 !1 !1 !0 !1 !0 !0 !0 !1 !0 !!346.813 !4.705 !50.70 !1 !0 !0 !1 !0 !0 !0 !0 !0!

! ! ! ! ! ! !.!! ! ! ! ! ! !: !!

Metafeatures: - simple, statistical, info-theoretic, landmarkers - target: aliphatic index, hydrophobicity, net

charge, mol. weight, sequence length, …

I. Olier et al. MetaSel@ECMLPKDD 2015

Best algorithm overall (10f CV)

I. Olier et al. MetaSel@ECMLPKDD 2015

Random Forest meta-classifier (10f CV)

I. Olier et al. MetaSel@ECMLPKDD 2015

Random Forest stacker (10f CV)

Frugal learningWhich algorithms are fast (and low-memory) but accurate?

In Python Notebook:

Frugal learningWhich algorithms are fast (and low-memory) but accurate?

Frugal learningWhich algorithms are fast (and low-memory) but accurate?

Meta-learning on streamsStream data in OpenML: ‘best’ algorithm changes over time Concept drift

• Use meta-learning to select the best models at each point in time

Meta-learning on streamsStream data in OpenML: ‘best’ algorithm changes over time

Evaluation

• Base-level:

• Interleaved train-then-test (prequential evaluation)

• Accuracy on data streams using predicted method [default, best]

• Meta-level:

• Leave one stream out

• Accuracy of predicting best model [0,1]

Meta-learning on streams

• Streaming ensembles (current work)

• Train multiple models, use meta-learning to weight their votes

• Stacking / Cascading

• BLast (Best-Last), J. van Rijn et al. ICDM 2015

• Simply choose model that performed best in previous window. Equivalent to state-of-the-art (Leveraging Bagging)

Algorithm selection (ranking)

J. van Rijn et al. IDA 2015

Learning curves in OpenML

• Identify k nearest prior datasets by distance between partial curves:

• Build a ranking of algorithms to run, start with overall best abest • Draw random algorithm acompetitor

• If acompetitor wins most, add to ranking, repeat

For new dataset: evaluate learning curves up to T (e.g. 256 instances) Fraction of full CV No other meta-features

0

0.02

0.04

0.06

0.08

0.1

1 4 16 64 256 1024 4096 16384 65536

Accu

racy

Los

s

Time (seconds)

Best on SampleAverage Rank

PCCPCC (A3R, r = 1)

For 53 classifiers on 39 datasets Multi-objective function A3R:

J. van Rijn et al. IDA 2015

Algorithm selection (ranking)

Towards automating machine learning

Human scientists

meta-data, models, evaluations

Automated processes

Data cleaning Algorithm Selection

Parameter Optimization Workflow construction

Post processing

API

Connect your tools and services to OpenML, so they may learn

Bruce Mau

When everything is connected to everything else, for better or for worse, everything matters.

- Open Source, on GitHub- Regular workshops, hackathons

Join OpenML

Next workshop: - Lorentz Center (Leiden),

14-18 March 2016

T H A N K Y O U

Joaquin Vanschoren

Jan van Rijn

Bernd Bischl

Matthias Feurer

Michel Lang

Nenad Tomašev

Giuseppe Casalicchio

Luis Torgo

You?

#OpenMLFarzan Majdani

Jakob Bossek