Fix: relative uncertainty

Author: heptaflar

kaleidoscope/algorithms/randomize.py

@@ -87,7 +87,7 @@ def randomize(
         if coverage != 1.0:
             u = u / coverage
         if relative:
-            u = u * x
+            u = np.abs(u * x)
         match self._dist:
             case "normal":
                 y = self._normal(seed, x, u)