1 files changed, 33 insertions, 0 deletions
diff --git a/gi/pf/backward.h b/gi/pf/backward.h
new file mode 100644
index 00000000..e67eff0c
--- /dev/null
+++ b/gi/pf/backward.h
@@ -0,0 +1,33 @@
+#ifndef _BACKWARD_H_
+#define _BACKWARD_H_
+
+#include <vector>
+#include <string>
+#include "wordid.h"
+
+struct Reachability;
+struct Model1;
+
+struct BackwardEstimator {
+  BackwardEstimator(const std::string& s2t,
+                    const std::string& t2s);
+  ~BackwardEstimator();
+
+  void InitializeGrid(const std::vector<WordID>& src,
+                      const std::vector<WordID>& trg,
+                      const Reachability& r,
+                      double src2trg_ratio,
+                      float* grid) const;
+
+ private:
+  float ComputeBackwardProb(const std::vector<WordID>& src,
+                            const std::vector<WordID>& trg,
+                            unsigned src_covered,
+                            unsigned trg_covered,
+                            double src2trg_ratio) const;
+
+  Model1* m1;
+  Model1* m1inv;
+};
+
+#endif