Computational and Mathematical Methods in Medicine / 2018 / Article / Alg 2

Research Article

Transfer Kernel Common Spatial Patterns for Motor Imagery Brain-Computer Interface Classification

Algorithm 2

TKL algorithm.
Input: Data ; kernel ; eigen-damping factor .
Output: Domain-invariant kernel .
(1) Compute the target kernel function , the source kernel
function , and cross-domain kernel function
by kernel .
(2) Eigendecompose the target kernel function for the
eigensystem by (5).
(3) Extrapolate for source eigenvector via Nystrm
approximation by (6).
(4) Generate the extrapolated source kernel by (7)
(5) Minimize the approximation error between the ground
truth source kernel and the extrapolated source
kernel by (8).
(6) Solve QP problem (9) for eigenspectrum
(7) Construct domain-invariant kernel by (11).