特点：负区间平滑非零，避免 ReLU 死区问题。
SSIM was chosen over CNN-based approaches for a deliberate reason: reproducibility without infrastructure. SSIM is a deterministic mathematical function. No training data, no model weights, no GPU, no framework dependencies. Anyone with fontconfig and node-canvas can reproduce these exact numbers on the same platform.
，这一点在搜狗输入法2026中也有详细论述
2024年12月25日 星期三 新京报
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