Innovation

Introducing Random Similarity Forests

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Random Similarity Forest is a machine learning algorithm capable of handling datasets with features of arbitrary data types while retaining each feature’s characteristic.

As evidenced by the rapid development of AI methods in recent years, the wealth of data gathered about humans and their surroundings drives new machine learning applications in various fields.

Consequently, more and more often, machine learning algorithms are trained using not only numerical data but also complex data objects. For example, multi-omics analyses attempt to combine numerical descriptions with distributions, time-series data, discrete sequences, and graphs. Such integration of data from different domains requires either omitting some of the data, creating separate models for different formats, or simplifying some of the data to adhere to a shared scale and format, all of which can hinder predictive performance. The proposed algorithm, called Random Similarity Forest, uses multiple domain-specific distance measures to combine the predictive performance of Random Forests with the flexibility of Similarity Forests. We show that Random Similarity Forests are on par with Random Forests on numerical data and outperform them on datasets from complex or mixed data domains. Our results highlight the applicability of Random Similarity Forests to noisy, multi-source datasets that are becoming ubiquitous in high-impact life science projects.

Introducing Random Similarity Forests
October 13, 2022

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