The distance metric calculates the Euclidean distance in domain space between the
candidate and its nearest neighbor in the set of points already evaluated on the
true model. Therefore, the most undersampled area of the domain will always be
selected. Note that this is a space-filling metric.
Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA-0003525.