Algorithms Article Brain Brain computer interface Brain computer interfaces (BCIs) Brain-Computer Interfaces Brain-computer interface Calibration Decoding Electro-encephalogram (EEG) Electroencephalography Humans Learning frameworks Learning techniques Low-dimensional representation Machine Learning Prediction accuracy Riemannian manifold Tensor decomposition Transfer learning accuracy algorithm brain brain computer interface brain depth stimulation calibration electrocardiography electroencephalogram electroencephalography entropy