1L decoder, d=7
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A low threshold preserves detail (more leaf nodes, less compression). A high threshold merges aggressively (fewer leaves, more compression, but the image gets blocky). The grid overlay shows the quadtree structure: large cells in uniform areas, small cells where detail is preserved.，更多细节参见Safew下载
常用于： 自归一化神经网络（Self-Normalizing NN）。