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+// util/edit-distance.h
+
+// Copyright 2009-2011     Microsoft Corporation;  Haihua Xu
+
+// See ../../COPYING for clarification regarding multiple authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//  http://www.apache.org/licenses/LICENSE-2.0
+//
+// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
+// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
+// MERCHANTABLITY OR NON-INFRINGEMENT.
+// See the Apache 2 License for the specific language governing permissions and
+// limitations under the License.
+
+
+#ifndef KALDI_UTIL_EDIT_DISTANCE_H_
+#define KALDI_UTIL_EDIT_DISTANCE_H_
+#include <vector>
+#include <set>
+#include <algorithm>
+#include <limits>
+#include <cassert>
+#include "base/kaldi-types.h"
+
+namespace kaldi {
+
+// Compute the edit-distance between two strings.
+template<class T>
+int32 LevenshteinEditDistance(const std::vector<T> &a,
+                              const std::vector<T> &b);
+
+
+// edit distance calculation with conventional method.
+// note: noise word must be filtered out from the hypothesis and reference sequence
+// before the following procedure conducted.
+template<class T>
+int32 LevenshteinEditDistance(const std::vector<T> &ref,
+                              const std::vector<T> &hyp,
+                              int32 *ins, int32 *del, int32 *sub);
+
+// This version of the edit-distance computation outputs the alignment
+// between the two.  This is a vector of pairs of (symbol a, symbol b).
+// The epsilon symbol (eps_symbol) must not occur in sequences a or b.
+// Where one aligned to no symbol in the other (insertion or deletion),
+// epsilon will be the corresponding member of the pair.
+// It returns the edit-distance between the two strings.
+
+template<class T>
+int32 LevenshteinAlignment(const std::vector<T> &a,
+                           const std::vector<T> &b,
+                           T eps_symbol,
+                           std::vector<std::pair<T, T> > *output);
+
+} // end namespace kaldi
+
+#include "edit-distance-inl.h"
+
+#endif