1 files changed, 33 insertions, 0 deletions
diff --git a/container-search/src/main/java/com/yahoo/search/ranking/LinearNormalizer.java b/container-search/src/main/java/com/yahoo/search/ranking/LinearNormalizer.java
new file mode 100644
index 00000000000..2cdba9d6361
--- /dev/null
+++ b/container-search/src/main/java/com/yahoo/search/ranking/LinearNormalizer.java
@@ -0,0 +1,33 @@
+// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.search.ranking;
+
+class LinearNormalizer extends Normalizer {
+
+    LinearNormalizer(int maxSize) {
+        super(maxSize);
+    }
+
+    void normalize() {
+        double min = Float.MAX_VALUE;
+        double max = -Float.MAX_VALUE;
+        for (int i = 0; i < size; i++) {
+            double val = data[i];
+            if (val < Float.MAX_VALUE && val > -Float.MAX_VALUE) {
+                min = Math.min(min, data[i]);
+                max = Math.max(max, data[i]);
+            }
+        }
+        double scale = 0.0;
+        double midpoint = 0.0;
+        if (max > min) {
+            scale = 1.0 / (max - min);
+            midpoint = (min + max) * 0.5;
+        }
+        for (int i = 0; i < size; i++) {
+            double old = data[i];
+            data[i] = 0.5 + scale * (old - midpoint);
+        }
+    }
+
+    String normalizing() { return "linear"; }
+}