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Delaunay triangulation nearest neighbor method#4

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ZLoverty wants to merge 4 commits intonkeim:masterfrom
ZLoverty:delaunay-neighbor
Open

Delaunay triangulation nearest neighbor method#4
ZLoverty wants to merge 4 commits intonkeim:masterfrom
ZLoverty:delaunay-neighbor

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@ZLoverty ZLoverty commented Mar 4, 2023

I've added a nearest neighbor method based on Delaunay triangulation, in addition to k-d tree, for computing affine field. k-d tree is the default method and DT method is invoked only if neighbor_method="delaunay" is used.

ZLoverty added 4 commits March 3, 2023 22:39
- this method does not require a manually input cutoff distance
- for manual checking the nearest neighbor results
- the problem is the numbers returned by _neighbor_list are not the original index
- add a synthetic test data at the end
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