This document summarizes Manuel Martín Salvador's background and research interests in automated and adaptive data pre-processing for building predictive models. It discusses how data pre-processing makes up a large portion of the data mining process but is labor intensive. The document also outlines OpenML, a scientific workflow platform and repository for machine learning experiments, and highlights opportunities to increase the number and types of pre-processing methods available on the platform as well as improve flow representation and recommendation.

1. Manuel Martín Salvador
@draxus
msalvador@bournemouth.ac.uk
OpenML workshop
Eindhoven 21/10/2014

2. Background
● MSc. Computer Engineering
● Master in Soft Computing and Intelligent Systems
Currently
● PhD Student – Automatic and adaptive pre-processing for building
predictive models
● Teaching – Data Mining lab

3. Data preparation and pre-processing

4. Data preparation and pre-processing

5. Data preparation and pre-processing
Labour
intensive
tasks
(up to 80% of
a data mining
process)

6. Automating pre-processing
A lot of available techniques
No free lunch
Multiple combinations
Order of pre-processing methods matters
No semantic → some approaches use ontologies
Meta-learning → needs a good database of
experiments

7. Scientific workflow platforms and
repositories with experiments
Software Repository Applications
DiscoveryNet (inactive) -
Kepler - Various
Taverna MyExperiment (open) Bioinformatics
Pegasus - Various
Galaxy - Biomedical
Pipeline Pilot Accelrys (commercial)
* MLComp (“open”) Machine Learning
Weka,MOA,R,RapidMiner OpenML (open) Machine Learning

8. OpenML statistics
Datasets: 1042
Tasks: 3025
Flows: 640
Runs: 31540
Valid: 24410
With errors: 7130
Datasets: 300
Individual components: 136
Paired components: 635
“Flow size”: 1 – 8198
2 – 12178
3 – 1993
4 – 1533
5 – 502
6 – 6
4500
4000
3500
3000
2500
2000
1500
1000
500
0
Distribution of components
1600
1400
1200
1000
800
600
400
200
0
Distribution of datasets
Only 3 Weka filters:
Principal Components, Discretize, PLSFilter

9. TO DO
How to increase the number of pre-processing methods in OpenML?
- The only way right now is using FilteredClassifier in Weka
- What about R, MOA, RapidMiner?
Improving flow representation
- Right now is difficult to see how components are connected
- Clear distinction of parameters
- What about including Weka flows (XML based) and ADAMS flows?
- PMML support?
Statistics for available data, tasks, flows and runs
Flow recommendation system for a given dataset
[dataset, data characteristics, prediction accuracy, flow_id]
Flow validation before executing it
[dataset, data characteristics, flow characteristics, failure]

10. A little bit further
Adapting flows while processing data streams
- Detecting changes in data characteristics
- Locally checking input/output in each flow component
- Change propagation
- Reducing cost of adaptation

11. Photos CC by Cristina Granados
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