lowerdir is the read-only directory (composefs) containing file metadata, and datadir is the directory containing the data (erofs).
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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.，推荐阅读91视频获取更多信息
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