Added CDER metric to use in MERT.

git-svn-id: https://mosesdecoder.svn.sourceforge.net/svnroot/mosesdecoder/trunk@4152 1f5c12ca-751b-0410-a591-d2e778427230

1 files changed, 59 insertions, 0 deletions

diff --git a/mert/CderScorer.h b/mert/CderScorer.h
new file mode 100644
index 000000000..1a2989b9e
--- /dev/null
+++ b/mert/CderScorer.h
@@ -0,0 +1,59 @@
+#ifndef __CDERSCORER_H__
+#define __CDERSCORER_H__
+
+#include <algorithm>
+#include <iostream>
+#include <string>
+#include <vector>
+#include "Types.h"
+#include "ScoreData.h"
+#include "Scorer.h"
+
+
+using namespace std;
+
+
+class CderScorer: public StatisticsBasedScorer
+{
+public:
+  CderScorer(const string& config);
+  virtual void setReferenceFiles(const vector<string>& referenceFiles);
+  virtual void prepareStats(size_t sid, const string& text, ScoreStats& entry)
+  {
+    vector<int> stats;
+    prepareStatsVector(sid, text, stats);
+
+    stringstream sout;
+    copy(stats.begin(),stats.end(),ostream_iterator<float>(sout," "));
+    string stats_str = sout.str();
+    entry.set(stats_str);
+  }
+  virtual void prepareStatsVector(size_t sid, const string& text, vector<int>& stats);
+
+  size_t NumberOfScores() {
+    return 2;
+  };
+
+  float calculateScore(const vector<int>& comps);
+
+private:
+  typedef vector<int> sent_t;
+  vector<vector<sent_t> > ref_sentences;
+
+  vector<int> computeCD(const sent_t& cand, const sent_t& ref);
+  int distance(int word1, int word2) 
+  {
+	  if (word1 == word2) 
+		  return 0;
+	  else 
+		  return 1;
+  }
+
+  //no copy
+  CderScorer(const CderScorer&);
+  ~CderScorer() {};
+  CderScorer& operator=(const CderScorer&);
+};
+
+
+#endif