Initial release

engine/plugins/schedulers/cosine.lua

@@ -0,0 +1,31 @@
+-- cosine.lua: Cosine scheduler — half-cosine S-curve
+
+scheduler = {
+    name        = "cosine",
+    display     = "Cosine",
+    description = "Cosine annealing — balanced S-curve",
+}
+
+function schedule(output, num_steps, shift)
+    for i = 0, num_steps - 1 do
+        local frac = i / num_steps
+        output[i] = 0.5 * (1.0 + math.cos(math.pi * frac))
+    end
+    clamp(output, num_steps)
+    apply_shift(output, num_steps, shift)
+end
+
+function apply_shift(ts, n, shift)
+    if shift == 1.0 then return end
+    for i = 0, n - 1 do
+        local t = ts[i]
+        ts[i] = shift * t / (1.0 + (shift - 1.0) * t)
+    end
+end
+
+function clamp(ts, n)
+    for i = 0, n - 1 do
+        if ts[i] < 1e-6 then ts[i] = 1e-6 end
+        if ts[i] > 1.0 then ts[i] = 1.0 end
+    end
+end