ngram count features

1 files changed, 29 insertions, 0 deletions

diff --git a/decoder/ff_ngrams.h b/decoder/ff_ngrams.h
new file mode 100644
index 00000000..82f61b33
--- /dev/null
+++ b/decoder/ff_ngrams.h
@@ -0,0 +1,29 @@
+#ifndef _NGRAMS_FF_H_
+#define _NGRAMS_FF_H_
+
+#include <vector>
+#include <map>
+#include <string>
+
+#include "ff.h"
+
+struct NgramDetectorImpl;
+class NgramDetector : public FeatureFunction {
+ public:
+  // param = "filename.lm [-o n]"
+  NgramDetector(const std::string& param);
+  ~NgramDetector();
+  virtual void FinalTraversalFeatures(const void* context,
+                                      SparseVector<double>* features) const;
+ 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* out_context) const;
+ private:
+  NgramDetectorImpl* pimpl_;
+};
+
+#endif