first span features

1 files changed, 26 insertions, 0 deletions

diff --git a/decoder/ff_spans.h b/decoder/ff_spans.h
new file mode 100644
index 00000000..588956c9
--- /dev/null
+++ b/decoder/ff_spans.h
@@ -0,0 +1,26 @@
+#ifndef _FF_SPANS_H_
+#define _FF_SPANS_H_
+
+#include <vector>
+#include "ff.h"
+#include "array2d.h"
+
+class SpanFeatures : public FeatureFunction {
+ public:
+  SpanFeatures(const std::string& param);
+ protected:
+  virtual void TraversalFeaturesImpl(const SentenceMetadata& smeta,
+                                     const Hypergraph::Edge& edge,
+                                     const std::vector<const void*>& ant_contexts,
+                                     SparseVector<double>* features,
+                                     SparseVector<double>* estimated_features,
+                                     void* context) const;
+  virtual void PrepareForInput(const SentenceMetadata& smeta);
+ private:
+  const int kS;
+  const int kX;
+  Array2D<int> span_feats_;
+  std::vector<int> end_span_ids_;
+};
+
+#endif