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diff --git a/kaldi_io/src/kaldi/matrix/kaldi-matrix-inl.h b/kaldi_io/src/kaldi/matrix/kaldi-matrix-inl.h
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+++ b/kaldi_io/src/kaldi/matrix/kaldi-matrix-inl.h
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+// matrix/kaldi-matrix-inl.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_MATRIX_KALDI_MATRIX_INL_H_
+#define KALDI_MATRIX_KALDI_MATRIX_INL_H_ 1
+
+#include "matrix/kaldi-vector.h"
+
+namespace kaldi {
+
+/// Empty constructor
+template<typename Real>
+Matrix<Real>::Matrix(): MatrixBase<Real>(NULL, 0, 0, 0) { }
+
+
+template<>
+template<>
+void MatrixBase<float>::AddVecVec(const float alpha, const VectorBase<float> &ra, const VectorBase<float> &rb);
+
+template<>
+template<>
+void MatrixBase<double>::AddVecVec(const double alpha, const VectorBase<double> &ra, const VectorBase<double> &rb); 
+
+template<typename Real>
+inline std::ostream & operator << (std::ostream & os, const MatrixBase<Real> & M) {
+  M.Write(os, false);
+  return os;
+}
+
+template<typename Real>
+inline std::istream & operator >> (std::istream & is, Matrix<Real> & M) {
+  M.Read(is, false);
+  return is;
+}
+
+
+template<typename Real>
+inline std::istream & operator >> (std::istream & is, MatrixBase<Real> & M) {
+  M.Read(is, false);
+  return is;
+}
+
+}// namespace kaldi
+
+
+#endif  // KALDI_MATRIX_KALDI_MATRIX_INL_H_