Incremental interface for scorer

git-svn-id: https://mosesdecoder.svn.sourceforge.net/svnroot/mosesdecoder/trunk@1678 1f5c12ca-751b-0410-a591-d2e778427230

mert/BleuScorer.cpp

@@ -176,25 +176,7 @@ void BleuScorer::prepareStats(int sid, const string& text, ScoreStats& entry) {
 		entry.set(stats_str);
 }
 
-
-float BleuScorer::score(const std::vector<unsigned int>& candidates) {
-	if (!_scoreData) {
-		throw std::runtime_error("score data not loaded");
-	}
-	vector<int> comps(LENGTH*2+1);
-	for (size_t i = 0; i < candidates.size(); ++i) {
-		ScoreStats stats = _scoreData->get(i,candidates[i]);
-		if (stats.size() != comps.size()) {
-			stringstream msg;
-			msg << "Bleu statistics for (" << "," << candidates[i] << ") have incorrect "
-				<< "number of fields. Found: " << stats.size() << " Expected: " 
-				<< comps.size();
-			throw runtime_error(msg.str());
-		}
-		for (size_t k = 0; k < comps.size(); ++k) {
-			comps[k] += stats.get(k);	
-		}
-	}
+float BleuScorer::bleu(const vector<int>& comps) {
 	float logbleu = 0.0;
 	for (int i = 0; i < LENGTH; ++i) {
 		if (comps[2*i] == 0) {
@@ -212,6 +194,49 @@ float BleuScorer::score(const std::vector<unsigned int>& candidates) {
 }
 
 
+
+void  BleuScorer::score(const candidates_t& candidates, const diffs_t& diffs,
+            scores_t& scores) {
+	if (!_scoreData) {
+		throw runtime_error("score data not loaded");
+	}
+    //calculate the score for the candidates
+	vector<int> comps(LENGTH*2+1);
+	for (size_t i = 0; i < candidates.size(); ++i) {
+		ScoreStats stats = _scoreData->get(i,candidates[i]);
+		if (stats.size() != comps.size()) {
+			stringstream msg;
+			msg << "Bleu statistics for (" << "," << candidates[i] << ") have incorrect "
+				<< "number of fields. Found: " << stats.size() << " Expected: " 
+				<< comps.size();
+			throw runtime_error(msg.str());
+		}
+		for (size_t k = 0; k < comps.size(); ++k) {
+			comps[k] += stats.get(k);	
+		}
+	}
+    scores.push_back(bleu(comps));
+
+    candidates_t last_candidates(candidates);
+    //apply each of the diffs, and get new scores
+    for (size_t i = 0; i < diffs.size(); ++i) {
+        for (size_t j = 0; j < diffs[i].size(); ++j) {
+            size_t sid = diffs[i][j].first;
+            size_t nid = diffs[i][j].second;
+            size_t last_nid = last_candidates[sid];
+            for (size_t k  = 0; k < comps.size(); ++k) {
+                int diff = _scoreData->get(sid,nid).get(k)
+                    - _scoreData->get(sid,last_nid).get(k);
+                comps[k] += diff;
+            }
+            last_candidates[sid] = nid;
+        }
+        scores.push_back(bleu(comps));
+    }
+
+}
+
+
 /*
 void BleuScorer::prepare(const vector<string>& referencefiles, const string& nbestfile) {
 	//processReferences(referencefiles, refcounts,reflengths,encodings);	

mert/BleuScorer.h

@@ -31,7 +31,8 @@ class BleuScorer: public Scorer {
 		virtual void setReferenceFiles(const vector<string>& referenceFiles);
 		virtual void prepareStats(int sid, const string& text, ScoreStats& entry);
 
-		virtual float score(const std::vector<unsigned int>& candidates);
+		virtual void score(const candidates_t& candidates, const diffs_t& diffs,
+            scores_t& scores);
 
 		static const int LENGTH;	
 		
@@ -83,6 +84,7 @@ class BleuScorer: public Scorer {
 
 		void encode(const string& line, vector<int>& encoded);
 		size_t countNgrams(const string& line, counts_t& counts, unsigned int n);
+        float bleu(const vector<int>& comps);
 
 		void dump_counts(counts_t& counts) {
 			for (counts_it i = counts.begin(); i != counts.end(); ++i) {

mert/Scorer.h

@@ -9,24 +9,73 @@
 
 #include "ScoreData.h"
 
+using namespace std;
+
+typedef vector<pair<unsigned int, unsigned int> > diff_t;
+typedef vector<diff_t> diffs_t;
+typedef vector<unsigned int> candidates_t;
+typedef vector<float> scores_t;
+
 class ScoreStats;
 
+/**
+  * Superclass of all scorers and dummy implementation. In order to add a new
+  * scorer it should be sufficient to override prepareStats(), setReferenceFiles()
+  * and score()
+**/
 class Scorer {
 	
 	public:
 		
-		Scorer(const std::string& name): _name(name), _scoreData(0)  {}
+		Scorer(const string& name): _name(name), _scoreData(0)  {}
 
-		const std::string& getName() const {return _name;}
 
 		/**
 		  * set the reference files. This must be called before prepareStats.
 		  **/
-		void setReferenceFiles(const std::vector<std::string>& referenceFiles) {
+		virtual void setReferenceFiles(const vector<string>& referenceFiles) {
 			//do nothing
 		}
 
 
+		/**
+		 * Process the given guessed text, corresponding to the given reference sindex
+         * and add the appropriate statistics to the entry.
+		**/
+		virtual void prepareStats(int sindex, const string& text, ScoreStats& entry) {
+			//cerr << text << std::endl;
+		}
+
+        /**
+          * Score using each of the candidate index, then go through the diffs
+          * applying each in turn, and calculating a new score each time.
+          **/
+        virtual void score(const candidates_t& candidates, const diffs_t& diffs,
+                scores_t& scores) {
+            //dummy impl
+			if (!_scoreData) {
+				throw runtime_error("score data not loaded");
+			}
+            scores.push_back(0);
+            for (size_t i = 0; i < diffs.size(); ++i) {
+                scores.push_back(0);
+            }
+        }
+
+
+		/**
+		  * Calculate the score of the sentences corresponding to the list of candidate
+		  * indices. Each index indicates the 1-best choice from the n-best list.
+		  **/
+		float score(const candidates_t& candidates) {
+            diffs_t diffs;
+            scores_t scores;
+            score(candidates, diffs, scores);
+            return scores[0];
+		}
+
+		const string& getName() const {return _name;}
+
         size_t getReferenceSize() {
             if (_scoreData) {
                 return _scoreData->size();
@@ -34,13 +83,6 @@ class Scorer {
             return 0;
         }
 		
-		/**
-		 * Process the given guessed text, corresponding to the given reference sindex
-         * and add the appropriate statistics to the entry.
-		**/
-		virtual void prepareStats(int sindex, const std::string& text, ScoreStats& entry) {
-			//std::cerr << text << std::endl;
-		}
 
 		/**
 		  * Set the score data, prior to scoring.
@@ -49,23 +91,11 @@ class Scorer {
 			_scoreData = scoreData;
 		}
 
-		/**
-		  * Calculate the score of the sentences corresponding to the list of candidate
-		  * indices. Each index indicates the 1-best choice from the n-best list.
-		  **/
-		virtual float score(const std::vector<unsigned int>& candidates) {
-			if (!_scoreData) {
-				throw std::runtime_error("score data not loaded");
-			}
-			return 0;
-		}
-
-
 		protected:
 			ScoreData* _scoreData;
 
 		private:
-			std::string _name;
+			string _name;
 
 };
 

mert/test_scorer.cpp

@@ -12,25 +12,27 @@ int main(int argc, char** argv) {
 	vector<string> references;
 	references.push_back("test_scorer_data/reference.txt");
 	//bs.prepare(references, "test-scorer-data/nbest.out");
-	BleuScorer scorer;
-	scorer.setReferenceFiles(references);
-	ScoreData sd(scorer);
+	Scorer* scorer = new BleuScorer();;
+	scorer->setReferenceFiles(references);
+	ScoreData sd(*scorer);
 	sd.loadnbest("test_scorer_data/nbest.out");
 	//sd.savetxt();
 
-	//calculate a  bleu scores
-	scorer.setScoreData(&sd);
-	unsigned int index = 0;
-	vector<unsigned int> candidates;
+	//calculate two   bleu scores, nbest and a diff
+	scorer->setScoreData(&sd);
+	candidates_t candidates(sd.size());;
 	for (size_t i  = 0; i < sd.size(); ++i) {
-        sd.get(i,index).savetxt("/dev/stdout");
-		candidates.push_back(index++);
-		if (index == 10) {
-			index = 0;
-		}
+        sd.get(i,0).savetxt("/dev/stdout");
 	}
 
-	cout << "Bleu ";
-	float bleu = scorer.score(candidates);
-	cout << bleu << endl;
+    diffs_t diffs;
+    diff_t diff;
+    diff.push_back(make_pair(1,2));
+    diff.push_back(make_pair(7,8));
+    diffs.push_back(diff);
+    
+    scores_t scores;
+    scorer->score(candidates,diffs,scores);
+
+	cout << "Bleus: " << scores[0] << " " << scores[1] <<  endl;
 }

mert/test_scorer.py

@@ -1,4 +1,4 @@
-#/usr/bin/python
+#!/usr/bin/python
 
 #
 # Calculate bleu score for test files using old (python) script
@@ -38,21 +38,30 @@ def main():
         tests[-1].append(text)
     nbest_fh.close()
 
-    # pick sentences to score with
-    index = 0
+    #  score with first best
     cookedtests = []
     for i  in range(len(tests)):
-        sentence = tests[i][index]
+        sentence = tests[i][0]
         cookedtest = (bleu.cook_test(sentence, cookedrefs[i]))
         stats = " ".join(["%d %d" % (c,g) for (c,g) in zip(cookedtest['correct'], cookedtest['guess'])])
         print " %s %d" % (stats ,cookedtest['reflen'])
         cookedtests.append(cookedtest)
-        index = index + 1
-        if index == 10:
-            index = 0
+    bleu1 = bleu.score_cooked(cookedtests)
 
-    bleu = bleu.score_cooked(cookedtests)
-    print "Bleu: ", bleu
+    # vary, and score again
+    cookedtests = []
+    for i in range(len(tests)):
+        sentence = tests[i][0]
+        if i == 7:
+            sentence = tests[i][8]
+        elif i == 1:
+            sentences = tests[i][2]
+        cookedtest = (bleu.cook_test(sentence, cookedrefs[i]))
+        cookedtests.append(cookedtest)
+    bleu2 = bleu.score_cooked(cookedtests)
+    
+
+    print "Bleus: ", bleu1,bleu2
     
 if __name__ == "__main__":
     main()