major refactor, break bad circular deps

git-svn-id: https://ws10smt.googlecode.com/svn/trunk@509 ec762483-ff6d-05da-a07a-a48fb63a330f

1 files changed, 110 insertions, 0 deletions

diff --git a/mteval/scorer.h b/mteval/scorer.h
new file mode 100644
index 00000000..f18c8c7f
--- /dev/null
+++ b/mteval/scorer.h
@@ -0,0 +1,110 @@
+#ifndef SCORER_H_
+#define SCORER_H_
+#include <vector>
+#include <string>
+#include <boost/shared_ptr.hpp>
+//TODO: use intrusive shared_ptr in Score (because there are many of them on ErrorSurfaces)
+#include "wordid.h"
+#include "intrusive_refcount.hpp"
+
+class Score;
+class SentenceScorer;
+typedef boost::intrusive_ptr<Score> ScoreP;
+typedef boost::shared_ptr<SentenceScorer> ScorerP;
+
+class ViterbiEnvelope;
+class ErrorSurface;
+class Hypergraph;  // needed for alignment
+
+//TODO: BLEU N (N separate arg, not part of enum)?
+enum ScoreType { IBM_BLEU, NIST_BLEU, Koehn_BLEU, TER, BLEU_minus_TER_over_2, SER, AER, IBM_BLEU_3 };
+ScoreType ScoreTypeFromString(const std::string& st);
+std::string StringFromScoreType(ScoreType st);
+
+class Score : public boost::intrusive_refcount<Score> {
+ public:
+  virtual ~Score();
+  virtual float ComputeScore() const = 0;
+  virtual float ComputePartialScore() const =0;
+  virtual void ScoreDetails(std::string* details) const = 0;
+  std::string ScoreDetails() {
+    std::string d;
+    ScoreDetails(&d);
+    return d;
+  }
+  virtual void TimesEquals(float scale); // only for bleu; for mira oracle
+  /// same as rhs.TimesEquals(scale);PlusEquals(rhs) except doesn't modify rhs.
+  virtual void PlusEquals(const Score& rhs, const float scale) = 0;
+  virtual void PlusEquals(const Score& rhs) = 0;
+  virtual void PlusPartialEquals(const Score& rhs, int oracle_e_cover, int oracle_f_cover, int src_len) = 0;
+  virtual void Subtract(const Score& rhs, Score *res) const = 0;
+  virtual ScoreP GetZero() const = 0;
+  virtual ScoreP GetOne() const = 0;
+  virtual bool IsAdditiveIdentity() const = 0; // returns true if adding this delta
+                                      // to another score results in no score change
+				      // under any circumstances
+  virtual void Encode(std::string* out) const = 0;
+  static ScoreP GetZero(ScoreType type);
+  static ScoreP GetOne(ScoreType type);
+  virtual ScoreP Clone() const = 0;
+protected:
+  Score() {  } // we define these explicitly because refcount is noncopyable
+  Score(Score const&) {  }
+};
+
+//TODO: make sure default copy ctors for score types do what we want.
+template <class Derived>
+struct ScoreBase : public Score {
+  ScoreP Clone() const  {
+    return ScoreP(new Derived(dynamic_cast<Derived const&>(*this)));
+  }
+};
+
+class SentenceScorer {
+ public:
+  typedef std::vector<WordID> Sentence;
+  typedef std::vector<Sentence> Sentences;
+  std::string desc;
+  Sentences refs;
+  SentenceScorer(std::string desc="SentenceScorer_unknown", Sentences const& refs=Sentences()) : desc(desc),refs(refs) {  }
+  std::string verbose_desc() const;
+  virtual float ComputeRefLength(const Sentence& hyp) const; // default: avg of refs.length
+  virtual ~SentenceScorer();
+  virtual ScoreP GetOne() const;
+  virtual ScoreP GetZero() const;
+  virtual ScoreP ScoreCandidate(const Sentence& hyp) const = 0;
+  virtual ScoreP ScoreCCandidate(const Sentence& hyp) const =0;
+  virtual const std::string* GetSource() const;
+  static ScoreP CreateScoreFromString(const ScoreType type, const std::string& in);
+  static ScorerP CreateSentenceScorer(const ScoreType type,
+    const std::vector<Sentence >& refs,
+    const std::string& src = "");
+};
+
+//TODO: should be able to GetOne GetZero without supplying sentence (just type)
+class DocScorer {
+ public:
+  ~DocScorer();
+  DocScorer() {  }
+  void Init(const ScoreType type,
+            const std::vector<std::string>& ref_files,
+            const std::string& src_file = "",
+            bool verbose=false
+    );
+  DocScorer(const ScoreType type,
+            const std::vector<std::string>& ref_files,
+            const std::string& src_file = "",
+            bool verbose=false
+    )
+  {
+    Init(type,ref_files,src_file,verbose);
+  }
+
+  int size() const { return scorers_.size(); }
+  ScorerP operator[](size_t i) const { return scorers_[i]; }
+ private:
+  std::vector<ScorerP> scorers_;
+};
+
+
+#endif