From 1b8181bf0d6e9137e6b9ccdbe414aec37377a1a9 Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@allegro.clab.cs.cmu.edu>
Date: Sun, 18 Nov 2012 13:35:42 -0500
Subject: major restructure of the training code

---
 training/dpmert/ces.cc | 90 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 training/dpmert/ces.cc

(limited to 'training/dpmert/ces.cc')

diff --git a/training/dpmert/ces.cc b/training/dpmert/ces.cc
new file mode 100644
index 00000000..157b2d17
--- /dev/null
+++ b/training/dpmert/ces.cc
@@ -0,0 +1,90 @@
+#include "ces.h"
+
+#include <vector>
+#include <sstream>
+#include <boost/shared_ptr.hpp>
+
+// TODO, if AER is to be optimized again, we will need this
+// #include "aligner.h"
+#include "lattice.h"
+#include "mert_geometry.h"
+#include "error_surface.h"
+#include "ns.h"
+
+using namespace std;
+
+const bool minimize_segments = true;    // if adjacent segments have equal scores, merge them
+
+void ComputeErrorSurface(const SegmentEvaluator& ss,
+                         const ConvexHull& ve,
+                         ErrorSurface* env,
+                         const EvaluationMetric* metric,
+                         const Hypergraph& hg) {
+  vector<WordID> prev_trans;
+  const vector<boost::shared_ptr<MERTPoint> >& ienv = ve.GetSortedSegs();
+  env->resize(ienv.size());
+  SufficientStats prev_score; // defaults to 0
+  int j = 0;
+  for (unsigned i = 0; i < ienv.size(); ++i) {
+    const MERTPoint& seg = *ienv[i];
+    vector<WordID> trans;
+#if 0
+    if (type == AER) {
+      vector<bool> edges(hg.edges_.size(), false);
+      seg.CollectEdgesUsed(&edges);  // get the set of edges in the viterbi
+                                     // alignment
+      ostringstream os;
+      const string* psrc = ss.GetSource();
+      if (psrc == NULL) {
+        cerr << "AER scoring in VEST requires source, but it is missing!\n";
+        abort();
+      }
+      size_t pos = psrc->rfind(" ||| ");
+      if (pos == string::npos) {
+        cerr << "Malformed source for AER: expected |||\nINPUT: " << *psrc << endl;
+        abort();
+      }
+      Lattice src;
+      Lattice ref;
+      LatticeTools::ConvertTextOrPLF(psrc->substr(0, pos), &src);
+      LatticeTools::ConvertTextOrPLF(psrc->substr(pos + 5), &ref);
+      AlignerTools::WriteAlignment(src, ref, hg, &os, true, 0, &edges);
+      string tstr = os.str();
+      TD::ConvertSentence(tstr.substr(tstr.rfind(" ||| ") + 5), &trans);
+    } else {
+#endif
+      seg.ConstructTranslation(&trans);
+    //}
+    //cerr << "Scoring: " << TD::GetString(trans) << endl;
+    if (trans == prev_trans) {
+      if (!minimize_segments) {
+        ErrorSegment& out = (*env)[j];
+        out.delta.fields.clear();
+        out.x = seg.x;
+	++j;
+      }
+      //cerr << "Identical translation, skipping scoring\n";
+    } else {
+      SufficientStats score;
+      ss.Evaluate(trans, &score);
+      // cerr << "score= " << score->ComputeScore() << "\n";
+      //string x1; score.Encode(&x1); cerr << "STATS: " << x1 << endl;
+      const SufficientStats delta = score - prev_score;
+      //string x2; delta.Encode(&x2); cerr << "DELTA: " << x2 << endl;
+      //string xx; delta.Encode(&xx); cerr << xx << endl;
+      prev_trans.swap(trans);
+      prev_score = score;
+      if ((!minimize_segments) || (!delta.IsAdditiveIdentity())) {
+        ErrorSegment& out = (*env)[j];
+        out.delta = delta;
+        out.x = seg.x;
+        ++j;
+      }
+    }
+  }
+  // cerr << " In segments: " << ienv.size() << endl;
+  // cerr << "Out segments: " << j << endl;
+  assert(j > 0);
+  env->resize(j);
+}
+
-- 
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