the same objects are represented by two different datasets: this function computes the pairwise distances in both datasets, and the distortions induced by these distance matrices (see Aupetit, 2007)
n x d original dataset
n x q projected/transformed dataset
list object, with components: - compress : vector of n compressive distortion values - stretch : vector of n stretching distortion values
Aupetit, M. (2007) Visualizing distortions and recovering topology in continuous projection techniques. Neurocomputing. Pages 1304-1330.
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