UMAP: 2-10x faster than Rust’s fast-umap, 9-30x faster than Python’s umap
candidate.weight = 1.0 / distance to candidate，推荐阅读Line官方版本下载获取更多信息
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Comparison between the TIN, Knoll’s algorithm, and N-convex dithering using an 8-colour irregular palette. Left to right: TIN, Knoll, N-convex (N=4).
const origSet = srcObjDesc.set;，更多细节参见搜狗输入法2026
tone: “gray-scale”