Revision: 17120
http://sourceforge.net/p/gate/code/17120
Author: adamfunk
Date: 2013-11-21 17:48:46 +0000 (Thu, 21 Nov 2013)
Log Message:
-----------
Now using a standard (documented) normalization function.
Modified Paths:
--------------
gate/trunk/plugins/TermRaider/src/gate/termraider/util/Utilities.java
Modified: gate/trunk/plugins/TermRaider/src/gate/termraider/util/Utilities.java
===================================================================
--- gate/trunk/plugins/TermRaider/src/gate/termraider/util/Utilities.java
2013-11-21 09:38:53 UTC (rev 17119)
+++ gate/trunk/plugins/TermRaider/src/gate/termraider/util/Utilities.java
2013-11-21 17:48:46 UTC (rev 17120)
@@ -24,6 +24,7 @@
public static final String EXTENSION_CSV = "csv";
private static double log10of2;
+ private static double xScale = 4.8;
static {
log10of2 = Math.log10(2.0);
@@ -42,9 +43,17 @@
return total / ((double) list.size());
}
-
+ /**
+ * The following produces the right half of a sigmoid
+ * curve adjusted so that
+ * f(0) = 0; f(inf) = 100; f(x>0) > 0
+ * @param score
+ * @return
+ */
public static double normalizeScore(double score) {
- double norm = 1.0 - 1.0 / (1.0 + Math.log10(1.0 + score));
+ double norm = 2.0 / (1.0 + Math.exp(-score / xScale)) - 1.0;
+ // The old normalization function was undocumented
+ //double norm = 1.0 - 1.0 / (1.0 + Math.log10(1.0 + score));
return (double) (100.0F * norm);
}
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