pyriemann.utils.tangentspace.tangent_space¶
- pyriemann.utils.tangentspace.tangent_space(X, Cref, *, metric='riemann')¶
Transform SPD matrices into tangent vectors.
Transform SPD matrices into tangent vectors, according to a reference matrix Cref and to a specific logarithmic map.
- Parameters
- Xndarray, shape (…, n_channels, n_channels)
SPD matrices.
- Crefndarray, shape (n_channels, n_channels)
The reference SPD matrix.
- metricstring, default=’riemann’
The metric used for logarithmic map, can be: ‘euclid’, ‘logeuclid’, ‘riemann’.
- Returns
- Tndarray, shape (…, n_channels * (n_channels + 1) / 2)
Tangent vectors.