What’s new in the package

A catalog of new features, improvements, and bug-fixes in each release.

v0.11.dev

v0.10 (January 2026)

• Add example in gallery to compare clustering algorithms on synthetic datasets. #374 by @qbarthelemy

• Enhance pyriemann.classification.MeanField, to be used as a feature extractor. #377 by @qbarthelemy

• Update pyRiemann from Python 3.9 - 3.11 to 3.10 - 3.12. #378 by @qbarthelemy

• Deprecate fit_transform() of pyriemann.spatialfilters.AJDC due to incompatible dimensions. #382 by @qbarthelemy

• Add pyriemann.datasets.RandomOverSampler for data augmentation of positive-definite matrices. #387 by @qbarthelemy

• Add pyriemann.utils.tangentspace.transport() for parallel transport of positive-definite matrices. #388 by @qbarthelemy

• Enhance pyriemann.datasets.make_matrices() to generate invertible, orthogonal, unitary or non-square matrices. #389 by @qbarthelemy

• Deprecate mean_identity. #392 by @qbarthelemy

• Enhance pyriemann.tangentspace.TangentSpace to support HPD matrices. #394 by @qbarthelemy

• Speedup of the ALM mean pyriemann.utils.mean.mean_alm(). #398 by @qbarthelemy

• Add pyriemann.utils.geodesic.geodesic_chol() and pyriemann.utils.mean.mean_chol(). #399 by @qbarthelemy

• Add pyriemann.utils.tangentspace.transport_logchol() for parallel transport with log-Cholesky metric. #400 by @qbarthelemy

• Add Thompson metric: pyriemann.utils.distance.distance_thompson(), pyriemann.utils.geodesic.geodesic_thompson(), and pyriemann.utils.mean.mean_thompson(). #401 by @qbarthelemy

• Fix sklearn error This Pipeline instance is not fitted yet. #406 by @qbarthelemy

• Add pyriemann.classification.NearestConvexHull. #405 by @qbarthelemy

v0.9 (July 2025)

• Add conjugate transpose operator pyriemann.utils.base.ctranspose() for real- and complex-valued ndarrays. #348 by @qbarthelemy

• Add pyriemann.embedding.TSNE, a Riemannian t-SNE implementation and update example comparing embeddings. #347 by @thibaultdesurrel

• Fix matplotlib warning. #351 by @qbarthelemy

• Enhance pyriemann.utils.mean.mean_power() using init, tol and maxiter parameters when p=0. #353 by @toncho11

• Enhance pyriemann.utils.distance.pairwise_distance() to support HPD matrices for “euclid”, “harmonic”, “logchol” and “logeuclid” metrics. #350 by @qbarthelemy

• Avoid duplicating code when using joblib. #359 by @qbarthelemy

• Fix sklearn warning This Pipeline instance is not fitted yet. #358 by @qbarthelemy

• Add pyriemann.utils.tangentspace.log_map() and pyriemann.utils.tangentspace.exp_map(). #363 by @qbarthelemy

• Add pyriemann.clustering.MeanShift, a Riemannian mean shift clustering algorithm. #364 by @qbarthelemy

• Fix pyriemann.spatialfilters.Xdawn to remove the parameters sample_weight that is not used on the fit_transformation. #371 by @bruAristimunha

v0.8 (February 2025)

• Enhance pyriemann.utils.mean.mean_ale() adding init parameter, and add function check_init() useful to all ajd and mean functions allowing initialization. #328 by @qbarthelemy

• Enhance pyriemann.utils.mean.mean_covariance() to support “power” and “poweuclid” metrics. #329 by @qbarthelemy

• Add tangent space alignment (TSA) in transfer learning module. TLStretch is deprecated and renamed into pyriemann.transfer._estimators.TLScale, and TSclassifier into pyriemann.classification.TSClassifier. #320 by @qbarthelemy

• Add an example using fNIRS data with a new estimator called HybridBlocks for classifying HbO and HbR signals. #323 by @timnaher

• Add directional derivatives pyriemann.utils.base.ddexpm() and pyriemann.utils.base.ddlogm(), and correct pyriemann.utils.tangentspace.log_map_logeuclid() and pyriemann.utils.tangentspace.exp_map_logeuclid(). #332 by @gabelstein

• Add pyriemann.utils.tangentspace.exp_map_wasserstein(), pyriemann.utils.tangentspace.log_map_wasserstein() and pyriemann.utils.geodesic.geodesic_wasserstein(). #331 by @gabelstein

• Enhance pyriemann.datasets.make_matrices(), to generate symmetric and Hermitian matrices, and add parameters defining the normal distribution to draw eigen vectors. Deprecate generate_random_spd_matrix. #339 by @qbarthelemy

• Enhance TSA, adding weights to transformers, and generalizing pyriemann.transfer._estimators.TLRotate from one-to-one to many-to-one domain adaptation in tangent space. #337 by @qbarthelemy

• Enhance pyriemann.utils.kernel.kernel_euclid() and pyriemann.utils.kernel.kernel_logeuclid() adding Cref parameter, and correct pyriemann.utils.kernel.kernel_riemann() when Y is different from X and Cref is None. #340 by @qbarthelemy

• Speedup of the Wasserstein mean pyriemann.utils.mean.mean_wasserstein() and extension of transport function pyriemann.utils.tangentspace.transport(). #341 by @gabelstein

v0.7 (October 2024)

• Add kernel parameter to pyriemann.embedding.LocallyLinearEmbedding. #293 by @gabelstein

• Add possibility for target_domain parameter of pyriemann.transfer._estimators.TLCenter to be empty, forcing transform() to recenter matrices to the last fitted domain. #292 by @brunaafl

• Enhance pyriemann.utils.ajd.ajd_pham() and pyriemann.utils.mean.mean_ale() functions to process HPD matrices. #299 by @qbarthelemy

• Add partial_fit function to pyriemann.preprocessing.Whitening for online applications. #277 by @qbarthelemy and @brentgaisford

• Add get_weights fixture to conftest and complete tests. #305 by @qbarthelemy

• Enhance pyriemann.estimation.Shrinkage to process HPD matrices. #307 by @qbarthelemy

• Add remote sensing examples on radar image clustering. #306 by @AmmarMian

• Add sample_weight parameter to MDM.fit_predict, Potato.fit, Potato.partial_fit, PotatoField.fit, PotatoField.partial_fit, Whitening.partial_fit. #309 by @qbarthelemy

• Update pyRiemann from Python 3.8 - 3.10 to 3.9 - 3.11. #310 by @qbarthelemy

• Add pyriemann.utils.distance.distance_logchol() to compute log-Cholesky distance. #311 by @qbarthelemy

• Add ajd_method parameter to pyriemann.spatialfilters.CSP. #313 by @qbarthelemy

• Add pyriemann.utils.distance.distance_poweuclid() and pyriemann.utils.mean.mean_poweuclid() to use power Euclidean metric. #312 by @qbarthelemy

• Enhance pyriemann.utils.mean.mean_power(): add init parameter and fix default initialization provided in the associated paper. #324 by @toncho11

• Add pyriemann.utils.distance.distance_chol(), pyriemann.utils.geodesic.geodesic_logchol(), pyriemann.utils.mean.mean_logchol(), and correct pyriemann.utils.distance.distance_logchol(). #322 by @gabelstein

v0.6 (April 2024)

• Update pyRiemann from Python 3.7 - 3.9 to 3.8 - 3.10. #254 by @qbarthelemy

• Speedup pairwise distance function pyriemann.utils.distance.pairwise_distance() by adding individual functions for ‘euclid’, ‘harmonic’, ‘logeuclid’ and ‘riemann’ metrics. #256 by @gabelstein

• Add pyriemann.utils.test.is_real_type() to check the type of input arrays and add pyriemann.utils.covariance.covariance_scm() allowing to process complex-valued inputs for ‘scm’ covariance estimator. #251 by @qbarthelemy

• Update to Read the Docs v2. #260 by @qbarthelemy

• Correct pyriemann.utils.distance.distance_wasserstein() and pyriemann.utils.distance.distance_kullback(), keeping only real part. #267 by @qbarthelemy

• Deprecate input covmats for mean functions, renamed into X. #252 by @qbarthelemy

• Add support for complex covariance estimation for ‘lwf’, ‘mcd’, ‘oas’ and ‘sch’ estimators. #274 by @gabelstein

• Deprecate input covtest for predict of pyriemann.classification.KNearestNeighbor, renamed into X. #259 by @qbarthelemy

• Correct check for kernel_fct param of pyriemann.classification.SVC. #272 by @qbarthelemy

• Add sample_weight parameter in TLCenter, TLStretch and TLRotate. #273 by @apmellot

• Deprecate HankelCovariances, renamed into pyriemann.estimation.TimeDelayCovariances. #275 by @qbarthelemy

• Add an example on augmented covariance matrix. #276 by @carraraig

• Remove function make_covariances. #280 by @qbarthelemy

• Speedup pyriemann.estimation.TimeDelayCovariances. #281 by @qbarthelemy

• Enhance ajd module and add a generic pyriemann.utils.ajd.ajd() function. #238 by @qbarthelemy

• Add pyriemann.utils.viz.plot_bihist(), pyriemann.utils.viz.plot_biscatter() and pyriemann.utils.viz.plot_cov_ellipse() for display. #287 by @qbarthelemy and @gcattan

• Add pyriemann.estimation.CrossSpectra and deprecate CospCovariances renamed into pyriemann.estimation.CoSpectra. #288 by @qbarthelemy

v0.5 (Jun 2023)

• Fix pyriemann.utils.distance.pairwise_distance() for non-symmetric metrics. #229 by @qbarthelemy

• Fix pyriemann.utils.mean.mean_covariance() used with keyword arguments. #230 by @qbarthelemy

• Add functions to test HPD and HPSD matrices, pyriemann.utils.test.is_herm_pos_def() and pyriemann.utils.test.is_herm_pos_semi_def(). #231 by @qbarthelemy

• Add function pyriemann.datasets.make_matrices() to generate SPD, SPSD, HPD and HPSD matrices. Deprecate function pyriemann.datasets.make_covariances. #232 by @qbarthelemy

• Add tests for matrix operators and distances for HPD matrices, complete doc and add references. #234 by @qbarthelemy

• Enhance tangent space module to process HPD matrices. #236 by @qbarthelemy

• Fix regression introduced in pyriemann.spatialfilters.Xdawn() by #214. #242 by @qbarthelemy

• Fix pyriemann.utils.kernel.kernel_euclid() applied on non-symmetric matrices. #245 by @qbarthelemy

• Add argument squared to all distances. #246 by @qbarthelemy

• Correct transform and predict_proba of pyriemann.classification.MeanField. #247 by @qbarthelemy

• Enhance mean module to process HPD matrices. #243 by @qbarthelemy

• Correct pyriemann.utils.distance.distance_mahalanobis(), keeping only real part. #249 by @qbarthelemy

• Fix pyriemann.datasets.sample_gaussian_spd() used with sampling_method=rejection on 2D matrices. #250 by @mhurte

v0.4 (Feb 2023)

• Add exponential and logarithmic maps for three main metrics: ‘euclid’, ‘logeuclid’ and ‘riemann’. pyriemann.utils.tangentspace.tangent_space() is splitted in two steps: (i) log_map_*() projecting SPD matrices into tangent space depending on the metric; and (ii) pyriemann.utils.tangentspace.upper() taking the upper triangular part of matrices. Similarly, pyriemann.utils.tangentspace.untangent_space() is splitted into (i) pyriemann.utils.tangentspace.unupper() and (ii) exp_map_*(). The different metrics for tangent space mapping can now be defined into pyriemann.tangentspace.TangentSpace, then used for transform() as well as for inverse_transform(). #195 by @qbarthelemy

• Enhance AJD: add init to pyriemann.utils.ajd.ajd_pham() and pyriemann.utils.ajd.rjd(), add warm_restart to pyriemann.spatialfilters.AJDC. #196 by @qbarthelemy

• Add parameter sampling_method to pyriemann.datasets.sample_gaussian_spd(), with rejection accelerating 2x2 matrices generation. #198 by @Artim436

• Add geometric medians for Euclidean and Riemannian metrics: pyriemann.utils.median_euclid() and pyriemann.utils.median_riemann(), and add an example in gallery to compare means and medians on synthetic datasets. #200 by @qbarthelemy

• Add score() to pyriemann.regression.KNearestNeighborRegressor. #205 by @qbarthelemy

• Add Transfer Learning module and examples, including RPA and MDWM. #189 by @plcrodrigues, @qbarthelemy and @sylvchev

• Add class distinctiveness function to measure the distinctiveness between classes on the manifold, pyriemann.classification.class_distinctiveness(), and complete an example in gallery to show how it works on synthetic datasets. #215 by @MSYamamoto

• Add example on ensemble learning applied to functional connectivity, and add pyriemann.utils.base.nearest_sym_pos_def(). #202 by @mccorsi and @sylvchev

• Add kernel matrices representation pyriemann.estimation.Kernels and complete example comparing estimators. #217 by @qbarthelemy

• Add a new covariance estimator, robust fixed point covariance, and add kwds arguments for all covariance based functions and classes. #220 by @qbarthelemy

• Add example in gallery on frequency band selection using class distinctiveness measure. #219 by @MSYamamoto

• Add pyriemann.utils.covariance.covariance_mest() supporting three robust M-estimators (Huber, Student-t and Tyler) and available for all covariance based functions and classes; and add an example on robust covariance estimation for corrupted data. Add also pyriemann.utils.distance.distance_mahalanobis() between between vectors and a Gaussian distribution. #223 by @qbarthelemy

v0.3 (July 2022)

• Correct spectral estimation in pyriemann.utils.covariance.cross_spectrum() to obtain equivalence with SciPy. #131 by @qbarthelemy

• Add instantaneous, lagged and imaginary coherences in pyriemann.utils.covariance.coherence() and pyriemann.estimation.Coherences. #132 by @qbarthelemy

• Add partial_fit in pyriemann.clustering.Potato, useful for an online update; and update example on artifact detection. #133 by @qbarthelemy

• Deprecate pyriemann.utils.viz.plot_confusion_matrix as sklearn integrate its own version. #135 by @sylvchev

• Add Ando-Li-Mathias (ALM) mean in pyriemann.utils.mean.mean_alm(). #56 by @sylvchev

• Add Schaefer-Strimmer covariance estimator in pyriemann.utils.covariance.covariances(), and an example to compare estimators #59 by @sylvchev

• Refactor tests + fix refit of pyriemann.tangentspace.TangentSpace. #136 by @sylvchev

• Add pyriemann.clustering.PotatoField, and an example on artifact detection. #142 by @qbarthelemy

• Add sampling SPD matrices from a Riemannian Gaussian distribution in pyriemann.datasets.sample_gaussian_spd(). #140 by @plcrodrigues

• Add new function pyriemann.datasets.make_gaussian_blobs() for generating random datasets with SPD matrices. #140 by @plcrodrigues

• Add module pyriemann.utils.viz in API, add pyriemann.utils.viz.plot_waveforms(), and add an example on ERP visualization. #144 by @qbarthelemy

• Add a special form covariance matrix pyriemann.utils.covariance.covariances_X(). #147 by @qbarthelemy

• Add masked and NaN means with Riemannian metric: pyriemann.utils.mean.maskedmean_riemann() and pyriemann.utils.mean.nanmean_riemann(). #149 by @qbarthelemy and @sylvchev

• Add corr option in pyriemann.utils.covariance.normalize(), to normalize covariance into correlation matrices. #153 by @qbarthelemy

• Add block covariance matrix: pyriemann.estimation.BlockCovariances and pyriemann.utils.covariance.block_covariances(). #154 by @gabelstein

• Add Riemannian Locally Linear Embedding: pyriemann.embedding.LocallyLinearEmbedding and pyriemann.embedding.locally_linear_embedding(). #159 by @gabelstein

• Add Riemannian Kernel Function: pyriemann.utils.kernel.kernel_riemann(). #159 by @gabelstein

• Fix fit in pyriemann.channelselection.ElectrodeSelection. #166 by @qbarthelemy

• Add power mean estimation in pyriemann.utils.mean.mean_power(). #170 by @qbarthelemy and @plcrodrigues

• Add example in gallery to compare classifiers on synthetic datasets. #175 by @qbarthelemy

• Add predict_proba in pyriemann.classification.KNearestNeighbor, and correct attribute classes_. #171 by @qbarthelemy

• Add Riemannian Support Vector Machine classifier: pyriemann.classification.SVC. #175 by @gabelstein and @qbarthelemy

• Add Riemannian Support Vector Machine regressor: pyriemann.regression.SVR. #175 by @gabelstein and @qbarthelemy

• Add K-Nearest-Neighbor regressor: pyriemann.regression.KNearestNeighborRegressor. #164 by @gabelstein, @qbarthelemy and @agramfort

• Add Minimum Distance to Mean Field classifier: pyriemann.classification.MeanField. #172 by @qbarthelemy and @plcrodrigues

• Add example on principal geodesic analysis (PGA) for SSVEP classification. #169 by @qbarthelemy

• Add pyriemann.utils.distance.distance_harmonic(), and sort functions by their names in code, doc and tests. #183 by @qbarthelemy

• Parallelize functions for dataset generation: pyriemann.datasets.make_gaussian_blobs(). #179 by @sylvchev

• Fix dispersion when generating datasets: pyriemann.datasets.sample_gaussian_spd(). #179 by @sylvchev

• Enhance base and distance functions, to process ndarrays of SPD matrices. #186 and #187 by @qbarthelemy

• Enhance utils functions, to process ndarrays of SPD matrices. #190 by @qbarthelemy

• Enhance means functions, with faster implementations and warning when convergence is not reached. #188 by @qbarthelemy

v0.2.7 (June 2021)

• Add example on SSVEP classification. #81 by @sylvchev

• Fix compatibility with scikit-learn v0.24

• Correct probas of pyriemann.classification.MDM. #100 by @qbarthelemy

• Add predict_proba for pyriemann.clustering.Potato, and an example on artifact detection. #105 by @qbarthelemy

• Add weights to Pham’s AJD algorithm pyriemann.utils.ajd.ajd_pham(). #112 by @qbarthelemy

• Add pyriemann.utils.covariance.cross_spectrum(), fix pyriemann.utils.covariance.cospectrum(); pyriemann.utils.covariance.coherence() output is kept unchanged. #118 by @qbarthelemy

• Add pyriemann.spatialfilters.AJDC for BSS and gBSS, with an example on artifact correction. #120 by @qbarthelemy

• Add pyriemann.preprocessing.Whitening, with optional dimension reduction. #122 by @qbarthelemy

v0.2.6 (March 2020)

• Remove support for Python 2, and update code for better scikit-learn v0.22 support. #79 by @alexandrebarachant

v0.2.5 (January 2018)

• Add BilinearFilter.

• Add a permutation test for generic scikit-learn estimator.

• Enhance stats module, with distance based t-test and f-test.

• Remove two way permutation test.

• Add FlatChannelRemover. #30 by @kingjr

• Add support for Python 3.5 in travis.

• Add Shrinkage transformer. #38 by @alexandrebarachant

• Add Coherences transformer.

• Add Embedding class. #54 by @plcrodrigues

v0.2.4 (June 2016)

• Improve documentation.

• Add TSclassifier for out-of the box tangent space classification.

• Add Wasserstein distance and mean.

• Add KNearestNeighbor classifier.

• Add softmax probabilities for MDM.

• Add CSP for covariance matrices.

• Add approximate joint diagonalization algorithms: JADE, PHAM, UWEDGE.

• Add ALE mean.

• Add multiclass CSP.

• Correct param name in CospCovariances to comply to scikit-learn.

• Correct attributes name in most modules to comply to the scikit-learn naming convention.

• Add HankelCovariances estimation.

• Add SPoC spatial filtering.

• Add harmonic mean.

• Add Kullback-Leibler mean.

v0.2.3 (November 2015)

• Add multiprocessing for MDM with joblib.

• Add Kullback-Leibler divergence.

• Add Riemannian Potato.

• Add sample_weight for mean estimation and MDM.