Initial release

engine/plugins/schedulers/beta57.lua

@@ -0,0 +1,42 @@
+-- beta57.lua: Beta(0.5, 0.7) distribution scheduler
+-- Requires beta_math companion for the inverse CDF computation.
+
+local beta_math = require("beta_math")
+
+scheduler = {
+    name        = "beta57",
+    display     = "Beta 57",
+    description = "Beta(0.5,0.7) — smooth S-curve from RES4LYF",
+}
+
+function schedule(output, num_steps, shift)
+    local alpha = 0.5
+    local beta  = 0.7
+
+    for i = 0, num_steps - 1 do
+        local u = (i + 0.5) / num_steps
+        local t = 1.0 - beta_math.ppf(u, alpha, beta)
+        output[i] = t
+    end
+    -- Sort descending
+    local vals = {}
+    for i = 0, num_steps - 1 do vals[i+1] = output[i] end
+    table.sort(vals, function(a,b) return a > b end)
+    for i = 0, num_steps - 1 do output[i] = vals[i+1] 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