Initial release

engine/plugins/guidance/dynamic_cfg.lua

@@ -0,0 +1,20 @@
+-- dynamic_cfg.lua: Cosine-decaying guidance schedule
+-- Full guidance early (structure), reduced guidance late (fine detail).
+-- Routes through native APG (momentum + projection + norm thresholding).
+
+guidance = {
+    name        = "dynamic_cfg",
+    display     = "Dynamic CFG",
+    description = "Cosine-decaying guidance schedule with APG projection",
+}
+
+function guide(pred_cond, pred_uncond, guidance_scale, result, Oc, T, norm_threshold)
+    local power = 0.5
+    local progress = (step_idx or 0) / math.max((total_steps or 1) - 1, 1)
+    local cos_val = math.max(math.cos(math.pi / 2 * progress), 0)
+    local decay = cos_val ^ power
+    local effective_scale = 1.0 + (guidance_scale - 1.0) * decay
+
+    -- Route through native APG with the decayed scale
+    apg(pred_cond, pred_uncond, effective_scale, result, Oc, T, norm_threshold)
+end