merge paul's extractor code

1 files changed, 18 insertions, 0 deletions

diff --git a/extractor/features/target_given_source_coherent.cc b/extractor/features/target_given_source_coherent.cc
new file mode 100644
index 00000000..c4551d88
--- /dev/null
+++ b/extractor/features/target_given_source_coherent.cc
@@ -0,0 +1,18 @@
+#include "target_given_source_coherent.h"
+
+#include <cmath>
+
+namespace extractor {
+namespace features {
+
+double TargetGivenSourceCoherent::Score(const FeatureContext& context) const {
+  double prob = (double) context.pair_count / context.num_samples;
+  return prob > 0 ? -log10(prob) : MAX_SCORE;
+}
+
+string TargetGivenSourceCoherent::GetName() const {
+  return "EgivenFCoherent";
+}
+
+} // namespace features
+} // namespace extractor