From 252fb164c208ec8f3005f8a652eb3b48c0644e3d Mon Sep 17 00:00:00 2001
From: Paul Baltescu <pauldb89@gmail.com>
Date: Fri, 1 Feb 2013 16:11:10 +0000
Subject: Second working commit.

---
 extractor/features/max_lex_target_given_source.cc | 30 +++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 extractor/features/max_lex_target_given_source.cc

(limited to 'extractor/features/max_lex_target_given_source.cc')

diff --git a/extractor/features/max_lex_target_given_source.cc b/extractor/features/max_lex_target_given_source.cc
new file mode 100644
index 00000000..d82182fe
--- /dev/null
+++ b/extractor/features/max_lex_target_given_source.cc
@@ -0,0 +1,30 @@
+#include "max_lex_target_given_source.h"
+
+#include <cmath>
+
+#include "../translation_table.h"
+
+MaxLexTargetGivenSource::MaxLexTargetGivenSource(
+    shared_ptr<TranslationTable> table) :
+    table(table) {}
+
+double MaxLexTargetGivenSource::Score(const FeatureContext& context) const {
+  // TODO(pauldb): Add NULL to source_words, after fixing translation table.
+  vector<string> source_words = context.source_phrase.GetWords();
+  vector<string> target_words = context.target_phrase.GetWords();
+
+  double score = 0;
+  for (string target_word: target_words) {
+    double max_score = 0;
+    for (string source_word: source_words) {
+      max_score = max(max_score,
+          table->GetTargetGivenSourceScore(source_word, target_word));
+    }
+    score += max_score > 0 ? -log10(max_score) : MAX_SCORE;
+  }
+  return score;
+}
+
+string MaxLexTargetGivenSource::GetName() const {
+  return "MaxLexEGivenF";
+}
-- 
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