1 files changed, 81 insertions, 0 deletions
diff --git a/vest/comb_scorer.cc b/vest/comb_scorer.cc
new file mode 100644
index 00000000..7b2187f4
--- /dev/null
+++ b/vest/comb_scorer.cc
@@ -0,0 +1,81 @@
+#include "comb_scorer.h"
+
+#include <cstdio>
+
+using namespace std;
+
+class BLEUTERCombinationScore : public Score {
+  friend class BLEUTERCombinationScorer;
+ public:
+  ~BLEUTERCombinationScore();
+  float ComputeScore() const {
+    return (bleu->ComputeScore() - ter->ComputeScore()) / 2.0f;
+  }
+  void ScoreDetails(string* details) const {
+    char buf[160];
+    sprintf(buf, "Combi = %.2f, BLEU = %.2f, TER = %.2f", 
+      ComputeScore()*100.0f, bleu->ComputeScore()*100.0f, ter->ComputeScore()*100.0f);
+    *details = buf;
+  }
+  void PlusEquals(const Score& delta) {
+    bleu->PlusEquals(*static_cast<const BLEUTERCombinationScore&>(delta).bleu);
+    ter->PlusEquals(*static_cast<const BLEUTERCombinationScore&>(delta).ter);
+  }
+  Score* GetZero() const {
+    BLEUTERCombinationScore* res = new BLEUTERCombinationScore;
+    res->bleu = bleu->GetZero();
+    res->ter = ter->GetZero();
+    return res;
+  }
+  void Subtract(const Score& rhs, Score* res) const {
+    bleu->Subtract(*static_cast<const BLEUTERCombinationScore&>(rhs).bleu,
+                   static_cast<BLEUTERCombinationScore*>(res)->bleu);
+    ter->Subtract(*static_cast<const BLEUTERCombinationScore&>(rhs).ter,
+                   static_cast<BLEUTERCombinationScore*>(res)->ter);
+  }
+  void Encode(std::string* out) const {
+    string bs, ts;
+    bleu->Encode(&bs);
+    ter->Encode(&ts);
+    out->clear();
+    (*out) += static_cast<char>(bs.size());
+    (*out) += bs;
+    (*out) += ts;
+  }
+  bool IsAdditiveIdentity() const {
+    return bleu->IsAdditiveIdentity() && ter->IsAdditiveIdentity();
+  }
+ private:
+  Score* bleu;
+  Score* ter;
+};
+
+BLEUTERCombinationScore::~BLEUTERCombinationScore() {
+  delete bleu;
+  delete ter;
+}
+
+BLEUTERCombinationScorer::BLEUTERCombinationScorer(const vector<vector<WordID> >& refs) {
+  bleu_ = SentenceScorer::CreateSentenceScorer(IBM_BLEU, refs);
+  ter_ = SentenceScorer::CreateSentenceScorer(TER, refs);
+}
+
+BLEUTERCombinationScorer::~BLEUTERCombinationScorer() {
+  delete bleu_;
+  delete ter_;
+}
+
+Score* BLEUTERCombinationScorer::ScoreCandidate(const std::vector<WordID>& hyp) const {
+  BLEUTERCombinationScore* res = new BLEUTERCombinationScore;
+  res->bleu = bleu_->ScoreCandidate(hyp);
+  res->ter = ter_->ScoreCandidate(hyp);
+  return res;
+}
+
+Score* BLEUTERCombinationScorer::ScoreFromString(const std::string& in) {
+  int bss = in[0];
+  BLEUTERCombinationScore* r = new BLEUTERCombinationScore;
+  r->bleu = SentenceScorer::CreateScoreFromString(IBM_BLEU, in.substr(1, bss));
+  r->ter = SentenceScorer::CreateScoreFromString(TER, in.substr(1 + bss));
+  return r;
+}