Offline-Riemannian-SSVEP

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Offline-Riemannian-SSVEP

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Classification of SSVEP EEG trials using MDM with various distances and divergences

// repository documentation

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# Riemannian distances and divergences

## Introduction
This code accompanies a the publication "Assessment of Riemannian distances and divergences for SSVEP-based BCI" which aims at assessing the impact of several distances/divergences on a real EEG dataset.

## Important files
- `main.m`

Classifies SSVEP trials from 12 subjects, using MDM with distances/divergences described in the aforementioned publication: arithmetic, harmonic, Riemannian, log-euclid, Kullback-Leibler, S-divergence, $\alpha$-divergence, Bhattacharrya, Wasserstein, and Jeffreys.
  The main output of this file are the classification accuracies and the computation time for each method/metric

- `alpha_cross_validation.m`

In the $\alpha$-divergence, the value of $\alpha$ is deternined through cross-validation.

- `loaddata.m`

Implement a function called in `main.m`. The path to the dataset is hardcoded herein.

- `swelling_effect_analysis.m`

Computes the determinants and traces of means of covariance matrices computed with different distances/divergences.
  It also computes them for each individual covariance matrix used in the computation of the means.

Only 1 subject and one class are used for illustrative purposes.

Offline-Riemannian-SSVEP

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