build-index renders all 1,418 source characters and 34 target characters as 48x48 greyscale PNGs, one per font that natively contains the character. Fontconfig is queried per-character to avoid brute-force rendering across all 230 fonts (97% reduction: 8,881 targeted renders vs 326,140 brute-force).
N-Closest Algorithm，推荐阅读heLLoword翻译官方下载获取更多信息
，更多细节参见一键获取谷歌浏览器下载
checkpoint.dataset_prefix，详情可参考搜狗输入法2026
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