Other Techniques for dimension reduction

[JonasIsensee]

The are approaches to dimension reduction other than PCA.
PCA is not always best ( finds only linear relationships)

i.e. radial basis functions could sometimes be better.

To implement this, we need a RadialBasisEmbedding <: AbstractSpatialEmbedding
that provides an interface similar to PCAEmbedding.
RadialBasisEmbedding(training_set, em::SpatioTemporalEmbedding) → embedding

and reconstruction method
embedding(inplace_vec, training_set, α, τ)

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