Revision: 17538
http://sourceforge.net/p/gate/code/17538
Author: adamfunk
Date: 2014-03-04 21:48:49 +0000 (Tue, 04 Mar 2014)
Log Message:
-----------
Sensible names for IDFs
Modified Paths:
--------------
gate/trunk/plugins/TermRaider/src/gate/termraider/bank/TfIdfTermbank.java
gate/trunk/plugins/TermRaider/src/gate/termraider/modes/IdfCalculation.java
Modified:
gate/trunk/plugins/TermRaider/src/gate/termraider/bank/TfIdfTermbank.java
===================================================================
--- gate/trunk/plugins/TermRaider/src/gate/termraider/bank/TfIdfTermbank.java
2014-03-04 21:00:13 UTC (rev 17537)
+++ gate/trunk/plugins/TermRaider/src/gate/termraider/bank/TfIdfTermbank.java
2014-03-04 21:48:49 UTC (rev 17538)
@@ -141,7 +141,7 @@
@CreoleParameter(comment = "inverted document frequency calculation",
- defaultValue = "Logarithmic")
+ defaultValue = "LogarithmicScaled")
public void setIdfCalculation(IdfCalculation mode) {
this.idfCalculation = mode;
}
Modified:
gate/trunk/plugins/TermRaider/src/gate/termraider/modes/IdfCalculation.java
===================================================================
--- gate/trunk/plugins/TermRaider/src/gate/termraider/modes/IdfCalculation.java
2014-03-04 21:00:13 UTC (rev 17537)
+++ gate/trunk/plugins/TermRaider/src/gate/termraider/modes/IdfCalculation.java
2014-03-04 21:48:49 UTC (rev 17538)
@@ -15,6 +15,7 @@
public enum IdfCalculation {
Logarithmic,
+ LogarithmicScaled,
Scaled,
Natural;
@@ -26,10 +27,14 @@
double df = (double) rawDF;
double n = (double) corpusSize;
- if (mode == Logarithmic) {
+ if (mode == LogarithmicScaled) {
return 1.0 + Utilities.log2(n / (df + 1.0));
}
+ if (mode == Logarithmic) {
+ return 1.0 + Utilities.log2(1.0 / (df + 1.0));
+ }
+
if (mode == Scaled) {
return (1.0 + n )/ (df + 1.0);
}
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