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2017

Supervised Learning with Indefinite Topological Kernels

Padellini, Tullia, Brutti, Pierpaolo

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Topological Data Analysis (TDA) is a recent and growing branch of statistics devoted to the study of the shape of the data.

In this work we investigate the predictive power of TDA in the context of supervised learning.
Since topological summaries, most noticeably the Persistence Diagram, are typically defined in complex spaces, we adopt a kernel approach to translate them into more familiar vector spaces.
We define a topological exponential kernel, we characterize it, and we show that, despite not being positive semi-definite, it can be successfully used in regression and classification tasks.

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