Data Science, Kernel Trick, Nonlinear Models, Machine Learning, Data Transformation.
feature space 𝑋 means that a 𝑛×𝑛 kernel matrix 𝐾 must be computed, containing the results of 𝜅(𝑥,𝑦) so that It is obvious that the size of 𝐾K increases quadratically with an increasing number of 𝑛n. Therefore, the calculation can get very memory and time-intensive for bigger datasets. Introducing