pyriemann.utils.mean.mean_harmonic¶

pyriemann.utils.mean.mean_harmonic(X=None, sample_weight=None, covmats=None)¶

Harmonic mean of invertible matrices.

\[\mathbf{M} = \left( \sum_i w_i \ {\mathbf{X}_i}^{-1} \right)^{-1}\]

Parameters:

Xndarray, shape (n_matrices, n, n): Set of invertible matrices.
sample_weightNone | ndarray, shape (n_matrices,), default=None: Weights for each matrix. If None, it uses equal weights.

Returns: