Что думаешь? Оцени!
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).
，这一点在im钱包官方下载中也有详细论述
"countDelta": 140
Fetched layers: 0 B in 0 seconds (0 B/s)
优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好