merge paul's extractor code

1 files changed, 17 insertions, 0 deletions

diff --git a/extractor/features/is_source_target_singleton.cc b/extractor/features/is_source_target_singleton.cc
new file mode 100644
index 00000000..03b3c62c
--- /dev/null
+++ b/extractor/features/is_source_target_singleton.cc
@@ -0,0 +1,17 @@
+#include "is_source_target_singleton.h"
+
+#include <cmath>
+
+namespace extractor {
+namespace features {
+
+double IsSourceTargetSingleton::Score(const FeatureContext& context) const {
+  return context.pair_count == 1;
+}
+
+string IsSourceTargetSingleton::GetName() const {
+  return "IsSingletonFE";
+}
+
+} // namespace features
+} // namespace extractor