Feature generation

User118888

Hello,

I'm researching about feature generation.

There is a feature generation option in AutoModel. Which algorithm does RapidMiner use for generating new features from existing features?

Thank you.

IngoRM

Hi,

We use a multi-objective optimization approach using evolutionary algorithms for simultaneously minimizing the predictive errorof a model and the complexity of a feature space.  This introduces regularization for the feature space optimization similar to the regularization used in general in ML.  By doing so, our approach does not suffer from feature bloat (like, for example, most genetic programming approaches) and is much more robust against overfitting.  The complexity is calculated based on the number of features and the amount and complexity of applied functions in case of feature generation.

You can learn more in my PhD thesis here: http://www-ai.cs.tu-dortmund.de/auto?self=$Publication_fz5hgy8b

In fact, many of my scientific publications have been dealing with automatic feature engineering for both supervised and unsupervised learning: http://www-ai.cs.tu-dortmund.de/PERSONAL/mierswa.html

Or in this webinar here: https://www.youtube.com/watch?v=oSLASLV4cTc

Or this white paper here: https://rapidminer.com/resource/multi-objective-optimization-ebook/

Or in a series of blog posts here: https://community.rapidminer.com/discussion/52782/multi-objective-feature-selection-part-4-making-better-machine-learning-models

I am sure there are also more places where we talked about this but that should be enough for now ;-)

Hope this helps,
Ingo