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diff --git a/kaldi_io/src/kaldi/matrix/sp-matrix-inl.h b/kaldi_io/src/kaldi/matrix/sp-matrix-inl.h
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+// matrix/sp-matrix-inl.h
+
+// Copyright 2009-2011  Ondrej Glembek;  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_SP_MATRIX_INL_H_
+#define KALDI_MATRIX_SP_MATRIX_INL_H_
+
+#include "matrix/tp-matrix.h"
+
+namespace kaldi {
+
+// All the lines in this file seem to be declaring template specializations.
+// These tell the compiler that we'll implement the templated function
+// separately for the different template arguments (float, double).
+
+template<>
+double SolveQuadraticProblem(const SpMatrix<double> &H, const VectorBase<double> &g,
+                             const SolverOptions &opts, VectorBase<double> *x);
+
+template<>
+float SolveQuadraticProblem(const SpMatrix<float> &H, const VectorBase<float> &g,
+                            const SolverOptions &opts, VectorBase<float> *x);
+
+}  // namespace kaldi
+
+
+#endif  // KALDI_MATRIX_SP_MATRIX_INL_H_