simple context feature for tagger

1 files changed, 23 insertions, 0 deletions

diff --git a/decoder/ff_context.h b/decoder/ff_context.h
new file mode 100644
index 00000000..0d22b027
--- /dev/null
+++ b/decoder/ff_context.h
@@ -0,0 +1,23 @@
+#ifndef _FF_CONTEXT_H_
+#define _FF_CONTEXT_H_
+
+#include <vector>
+#include "ff.h"
+
+class RuleContextFeatures : public FeatureFunction {
+ public:
+  RuleContextFeatures(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:
+  std::vector<WordID> current_input;
+  WordID kSOS, kEOS;
+};
+
+#endif