From b40c064987b1fb188daf040a068a459711385eac Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@allegro.clab.cs.cmu.edu>
Date: Sat, 6 Sep 2014 02:55:29 -0400
Subject: ld commit

---
 mteval/levenshtein.h | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 mteval/levenshtein.h

(limited to 'mteval')

diff --git a/mteval/levenshtein.h b/mteval/levenshtein.h
new file mode 100644
index 00000000..13a97047
--- /dev/null
+++ b/mteval/levenshtein.h
@@ -0,0 +1,29 @@
+#ifndef _LEVENSHTEIN_H_
+#define _LEVENSHTEIN_H_
+
+namespace cdec {
+
+template <typename V>
+inline unsigned LevenshteinDistance(const V& a, const V& b) {
+  const unsigned m = a.size(), n = b.size();
+  std::vector<unsigned> edit((m + 1) * 2);
+  for (unsigned i = 0; i <= n; i++) {
+    for (unsigned j = 0; j <= m; j++) {
+      if (i == 0)
+        edit[j] = j;
+      else if (j == 0)
+        edit[(i % 2) * (m + 1)] = i;
+      else
+        edit[(i % 2) * (m + 1) + j] = std::min(std::min(
+                                edit[(i % 2) * (m + 1) + j - 1] + 1,
+                                edit[((i - 1) % 2) * (m + 1) + j] + 1),
+                                edit[((i - 1) % 2) * (m + 1) + (j - 1)] 
+                                    + (a[j - 1] == b[i - 1] ? 0 : 1));
+    }
+  }
+  return edit[(n % 2) * (m + 1) + m];
+}
+
+}
+
+#endif
-- 
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