From f2fcf9e8aa0e5dee75fd08ee915488ec1a741975 Mon Sep 17 00:00:00 2001
From: Chris Dyer <prguest11@taipan.cs>
Date: Mon, 16 Apr 2012 19:39:36 +0100
Subject: feature extraction helper

---
 rst_parser/arc_factored.cc | 21 +++++++++++++++++++++
 rst_parser/arc_factored.h  |  5 ++++-
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/rst_parser/arc_factored.cc b/rst_parser/arc_factored.cc
index 44e769b8..34c689f4 100644
--- a/rst_parser/arc_factored.cc
+++ b/rst_parser/arc_factored.cc
@@ -12,6 +12,27 @@ using namespace std;
 using namespace std::tr1;
 using namespace boost;
 
+void EdgeSubset::ExtractFeatures(const TaggedSentence& sentence,
+                                 const std::vector<boost::shared_ptr<ArcFeatureFunction> >& ffs,
+                                 SparseVector<double>* features) const {
+  SparseVector<weight_t> efmap;
+  for (int i = 0; i < ffs.size(); ++i) {
+    const ArcFeatureFunction& ff= *ffs[i];
+    for (int j = 0; j < h_m_pairs.size(); ++j) {
+      efmap.clear();
+      ff.EgdeFeatures(sentence, h_m_pairs[j].first,
+                      h_m_pairs[j].second,
+                      &efmap);
+      (*features) += efmap;
+    }
+    for (int j = 0; j < roots.size(); ++j) {
+      efmap.clear();
+      ff.EgdeFeatures(sentence, -1, roots[j], &efmap);
+      (*features) += efmap;
+    }
+  }
+}
+
 void ArcFactoredForest::ExtractFeatures(const TaggedSentence& sentence,
                                         const std::vector<boost::shared_ptr<ArcFeatureFunction> >& ffs) {
   for (int i = 0; i < ffs.size(); ++i) {
diff --git a/rst_parser/arc_factored.h b/rst_parser/arc_factored.h
index 4de38b66..a271c8d4 100644
--- a/rst_parser/arc_factored.h
+++ b/rst_parser/arc_factored.h
@@ -17,14 +17,17 @@ struct TaggedSentence {
   std::vector<WordID> pos;
 };
 
+struct ArcFeatureFunction;
 struct EdgeSubset {
   EdgeSubset() {}
   std::vector<short> roots; // unless multiroot trees are supported, this
                             // will have a single member
   std::vector<std::pair<short, short> > h_m_pairs; // h,m start at 0
+  void ExtractFeatures(const TaggedSentence& sentence,
+                       const std::vector<boost::shared_ptr<ArcFeatureFunction> >& ffs,
+                       SparseVector<double>* features) const;
 };
 
-struct ArcFeatureFunction;
 class ArcFactoredForest {
  public:
   ArcFactoredForest() : num_words_() {}
-- 
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