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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[0.2.2]

Fix

  • Updated license badge.
  • Fixed LOESS mechanism figure path.

[0.2.1]

Added

  • Added visual validation to the bench branch.

Changed

  • Reduced figures size significantly.
  • Implement naming consistency for auto_converge (removed auto_convergence).

Fixed

  • Fixed boundary_degree_fallback pass to online and streaming adapters.
  • Fixed boundary_degree_fallback pass to custom_vertex_pass and VertexPassFn.
  • Fixed KFold CV bug through adding explicit sorting of training subsets and using robust binary-search interpolation for each test point.
  • Fixed auto_converge support for Online adapter.

[0.2.0]

Added

  • Added VertexPassFn and custom_vertex_pass support to enable parallelized/accelerated interpolation fitting.
  • Added support for custom vertex pass callbacks to all adapters (Batch, Streaming, Online).
  • Added support for custom parallel/accelerated standard error calculation via custom_interval_pass.
  • Added KDTreeBuilderFn and custom_kdtree_builder hook to enable external parallel KD-tree construction.
  • Added KDTree::from_parts and exposed KDNode and KDTree::calculate_left_subtree_size to support custom tree building.
  • Added neighborhood caching in InterpolationSurface to significantly optimize performance during robustness iterations.
  • Added configurable boundary_degree_fallback option to control polynomial degree reduction at boundary vertices during interpolation. Defaults to true for stability; set to false to match R's loess behavior exactly.

Changed

  • Changed license from AGPL-3.0-or-later to dual MIT OR Apache-2.0.
  • Expanded SmoothPassFn, CVPassFn, and IntervalPassFn signatures to include full multi-dimensional context (dimensions, scaling, polynomial degree, etc.).
  • Improved data propagation in InterpolationSurface to ensure all necessary coordinate and value slices are available to custom pass implementations.
  • Updated LoessExecutor to correctly handle augmented data when switching between direct and interpolation modes.
  • Updated InterpolationSurface::build to accept and propagate polynomial_degree, weight_function, zero_weight_fallback, distance_metric, and scales for custom_vertex_pass. Also, updated LoessExecutor to pass these configured values correctly.
  • Improved documentation.

Fixed

  • Fixed a potential crash in parallel interpolation refinement by correctly propagating augmented data slices to vertex fitting functions.
  • Fixed inconsistent parameter types in custom pass callbacks.
  • Fixed missing setters for online and streaming adapters.
  • Fixed incorrect standard error propagation in BatchLoessBuilder.
  • Added Boundary Linear Fallback strategy to InterpolationSurface to prevent numerical instability ("explosions") at data boundaries when using high-degree polynomials (Quadratic, Cubic, Quartic).
  • Fixed missing max_distance update in the KD-Tree search, which incorrectly calculated the bandwidth for tricube weights.
  • Fixed cumulative cross-contamination in regression buffers, which were not being zeroed between query points.
  • Delegated 2D Cubic and 3D Quadratic from context to specialized accumulators.
  • Fixed horizontal phase shift in Interpolation mode when using boundary policies (Extend, Reflect, Zero). The robustness iteration loop was incorrectly using augmented data indices instead of original data for query point evaluation.

[0.1.0]

  • Initial release.