From 3f608d4c3fa7b98db4fbc64ff2b66e64072f38d6 Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@cs.cmu.edu>
Date: Tue, 1 Mar 2011 02:40:25 -0500
Subject: deal with SOS

---
 training/augment_grammar.cc | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/training/augment_grammar.cc b/training/augment_grammar.cc
index 9b7fc7be..48ef23fc 100644
--- a/training/augment_grammar.cc
+++ b/training/augment_grammar.cc
@@ -57,6 +57,8 @@ bool InitCommandLine(int argc, char** argv, po::variables_map* conf) {
   return true;
 }
 
+lm::WordIndex kSOS;
+
 template <class Model> float Score(const vector<WordID>& str, const Model &model) {
   typename Model::State state, out;
   lm::FullScoreReturn ret;
@@ -65,9 +67,13 @@ template <class Model> float Score(const vector<WordID>& str, const Model &model
 
   for (int i = 0; i < str.size(); ++i) {
     lm::WordIndex vocab = ((str[i] < word_map.size() && str[i] > 0) ? word_map[str[i]] : 0);
-    ret = model.FullScore(state, vocab, out);
-    total += ret.prob;
-    state = out;
+    if (vocab == kSOS) {
+      state = model.BeginSentenceState();
+    } else {
+      ret = model.FullScore(state, vocab, out);
+      total += ret.prob;
+      state = out;
+    }
   }
   return total;
 }
@@ -76,6 +82,7 @@ static void RuleHelper(const TRulePtr& new_rule, const unsigned int ctf_level, c
   cout << *new_rule << " SrcLM=" << Score(new_rule->f_, *ngram) << endl;
 }
 
+
 int main(int argc, char** argv) {
   po::variables_map conf;
   if (!InitCommandLine(argc, argv, &conf)) return 1;
@@ -84,7 +91,9 @@ int main(int argc, char** argv) {
     VMapper vm(&word_map);
     kconf.enumerate_vocab = &vm; 
     ngram = new lm::ngram::ProbingModel(conf["source_lm"].as<string>().c_str(), kconf);
+    kSOS = word_map[TD::Convert("<s>")];
     cerr << "Loaded " << (int)ngram->Order() << "-gram KenLM (MapSize=" << word_map.size() << ")\n";
+    cerr << "  <s> = " << kSOS << endl;
   } else { ngram = NULL; }
   assert(ngram);
   RuleLexer::ReadRules(&cin, &RuleHelper, NULL);
-- 
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