DarthAffe/stable-diffusion.cpp
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apg: normalize diff_norm calculation by tensor size (#1620)

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stduhpf authored and GitHub committed 2026-06-08 21:56:15 +08:00
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src/runtime/guidance.cpp
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@@ -173,8 +173,9 @@ namespace sd::guidance {
} }
float diff_norm = 0.0f; float diff_norm = 0.0f;
const int standard_res = 2 * 1024 / 8; // Use SDXL as the standard resolution (1024x1024, 8x8 patches, 4=2x2 channels)
if (params_.norm_threshold > 0.0f) { if (params_.norm_threshold > 0.0f) {
diff_norm = std::sqrt((deltas * deltas).sum()); diff_norm = std::sqrt((deltas * deltas).sum()) * standard_res / std::sqrt(static_cast<float>(deltas.numel()));
} }
float apg_scale_factor = 1.0f; float apg_scale_factor = 1.0f;