Add Nearest Neighbor interpolator#287
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This PR implements the Nearest Neighbor interpolator requested in #166, supporting both univariate and multivariate parameter spaces.
Key Features:
scipy.interpolate.interp1d(kind='nearest')for 1D spaces (withfill_value='extrapolate'for robust boundary handling).scipy.interpolate.NearestNDInterpolatorfor ND spaces.rescale=Trueargument by default for the ND interpolator to prevent severe distance scaling distortions across physical parameters of varying magnitudes.Testing:
tests/test_nearest.py(8 passing tests).tests/test_parallel/test_nearest.py.More interpolators such as splines etc will be added in subsequent additions.