idf

ultraist · Aug 24, 2009 · 688a763 · 688a763
1 parent 387bad2
commit 688a763
Show file tree

Hide file tree

Showing 2 changed files with 877 additions and 877 deletions.
diff --git a/Repo.pm b/Repo.pm
@@ -169,9 +169,9 @@ sub ranking
     # idf
     my $eps = 1e-64;
     my $ud = log($eps + scalar(@{$user->users()}));
-    my $ilog2 = 1.0 / log(2.0);
+    my $ilog = 1.0 / log(3.0);
     foreach my $rid (keys(%{$self->{id}})) {
-	$self->{id}->{$rid}->{idf} = 1 + $ilog2 * ($ud - log(3 + $self->{id}->{$rid}->{freq}));
+	$self->{id}->{$rid}->{idf} = 1 + $ilog * ($ud - log($eps + $self->{id}->{$rid}->{freq}));
     }
 
     # normalize freq