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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
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I built Engramma to explore better approaches for design systems and improves the experience of working with them. It’s very much a work in progress with only a handful of users, so this warning felt especially surreal.