From a037f52a87f7d5711b5521047e7fb3fcd756c647 Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@cs.cmu.edu>
Date: Wed, 13 Jul 2011 00:14:34 -0400
Subject: escape feature names

---
 decoder/ff_spans.cc | 39 +++++++++++++++++++++++++--------------
 1 file changed, 25 insertions(+), 14 deletions(-)

(limited to 'decoder')

diff --git a/decoder/ff_spans.cc b/decoder/ff_spans.cc
index e1da088d..bc23974d 100644
--- a/decoder/ff_spans.cc
+++ b/decoder/ff_spans.cc
@@ -13,6 +13,17 @@
 
 using namespace std;
 
+namespace {
+  string Escape(const string& x) {
+    string y = x;
+    for (int i = 0; i < y.size(); ++i) {
+      if (y[i] == '=') y[i]='_';
+      if (y[i] == ';') y[i]='_';
+    }
+    return y;
+  }
+}
+
 // log transform to make long spans cluster together
 // but preserve differences
 int SpanSizeTransform(unsigned span_size) {
@@ -140,19 +151,19 @@ void SpanFeatures::PrepareForInput(const SentenceMetadata& smeta) {
     word = MapIfNecessary(word);
     ostringstream sfid;
     sfid << "ES:" << TD::Convert(word);
-    end_span_ids_[i] = FD::Convert(sfid.str());
+    end_span_ids_[i] = FD::Convert(Escape(sfid.str()));
     ostringstream esbiid;
     esbiid << "EBI:" << TD::Convert(bword) << "_" << TD::Convert(word);
-    end_bigram_ids_[i] = FD::Convert(esbiid.str());
+    end_bigram_ids_[i] = FD::Convert(Escape(esbiid.str()));
     ostringstream bsbiid;
     bsbiid << "BBI:" << TD::Convert(bword) << "_" << TD::Convert(word);
-    beg_bigram_ids_[i] = FD::Convert(bsbiid.str());
+    beg_bigram_ids_[i] = FD::Convert(Escape(bsbiid.str()));
     ostringstream bfid;
     bfid << "BS:" << TD::Convert(bword);
-    beg_span_ids_[i] = FD::Convert(bfid.str());
+    beg_span_ids_[i] = FD::Convert(Escape(bfid.str()));
     if (use_collapsed_features_) {
-      end_span_vals_[i] = feat2val_[sfid.str()] + feat2val_[esbiid.str()];
-      beg_span_vals_[i] = feat2val_[bfid.str()] + feat2val_[bsbiid.str()];
+      end_span_vals_[i] = feat2val_[Escape(sfid.str())] + feat2val_[Escape(esbiid.str())];
+      beg_span_vals_[i] = feat2val_[Escape(bfid.str())] + feat2val_[Escape(bsbiid.str())];
     }
   }
   for (int i = 0; i <= lattice.size(); ++i) {
@@ -167,16 +178,16 @@ void SpanFeatures::PrepareForInput(const SentenceMetadata& smeta) {
       word = MapIfNecessary(word);
       ostringstream pf;
       pf << "S:" << TD::Convert(bword) << "_" << TD::Convert(word);
-      span_feats_(i,j).first = FD::Convert(pf.str());
-      span_feats_(i,j).second = FD::Convert("S_" + pf.str());
+      span_feats_(i,j).first = FD::Convert(Escape(pf.str()));
+      span_feats_(i,j).second = FD::Convert(Escape("S_" + pf.str()));
       ostringstream lf;
       const unsigned span_size = (i < j ? j - i : i - j);
       lf << "LS:" << SpanSizeTransform(span_size) << "_" << TD::Convert(bword) << "_" << TD::Convert(word);
-      len_span_feats_(i,j).first = FD::Convert(lf.str());
-      len_span_feats_(i,j).second = FD::Convert("S_" + lf.str());
+      len_span_feats_(i,j).first = FD::Convert(Escape(lf.str()));
+      len_span_feats_(i,j).second = FD::Convert(Escape("S_" + lf.str()));
       if (use_collapsed_features_) {
-        span_vals_(i,j).first = feat2val_[pf.str()] + feat2val_[lf.str()];
-        span_vals_(i,j).second = feat2val_["S_" + pf.str()] + feat2val_["S_" + lf.str()];
+        span_vals_(i,j).first = feat2val_[Escape(pf.str())] + feat2val_[Escape(lf.str())];
+        span_vals_(i,j).second = feat2val_[Escape("S_" + pf.str())] + feat2val_[Escape("S_" + lf.str())];
       }
     }
   } 
@@ -209,14 +220,14 @@ void RuleNgramFeatures::TraversalFeaturesImpl(const SentenceMetadata& smeta,
       const string& cur = TD::Convert(w);
       ostringstream os;
       os << "RB:" << prev << '_' << cur;
-      const int fid = FD::Convert(os.str());
+      const int fid = FD::Convert(Escape(os.str()));
       if (fid <= 0) return;
       f.add_value(fid, 1.0);
       prev = cur;
     }
     ostringstream os;
     os << "RB:" << prev << '_' << "</r>";
-    f.set_value(FD::Convert(os.str()), 1.0);
+    f.set_value(FD::Convert(Escape(os.str())), 1.0);
   }
   (*features) += it->second;
 }
-- 
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