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+// matrix/matrix-common.h
+
+// Copyright 2009-2011  Microsoft Corporation
+
+// 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_MATRIX_COMMON_H_
+#define KALDI_MATRIX_MATRIX_COMMON_H_
+
+// This file contains some #includes, forward declarations
+// and typedefs that are needed by all the main header
+// files in this directory.
+
+#include "base/kaldi-common.h"
+#include "matrix/kaldi-blas.h"
+
+namespace kaldi {
+typedef enum {
+  kTrans    = CblasTrans,
+  kNoTrans = CblasNoTrans
+} MatrixTransposeType;
+
+typedef enum {
+  kSetZero,
+  kUndefined,
+  kCopyData
+} MatrixResizeType;
+
+typedef enum {
+  kTakeLower,
+  kTakeUpper,
+  kTakeMean,
+  kTakeMeanAndCheck
+} SpCopyType;
+
+template<typename Real> class VectorBase;
+template<typename Real> class Vector;
+template<typename Real> class SubVector;
+template<typename Real> class MatrixBase;
+template<typename Real> class SubMatrix;
+template<typename Real> class Matrix;
+template<typename Real> class SpMatrix;
+template<typename Real> class TpMatrix;
+template<typename Real> class PackedMatrix;
+
+// these are classes that won't be defined in this
+// directory; they're mostly needed for friend declarations.
+template<typename Real> class CuMatrixBase;
+template<typename Real> class CuSubMatrix;
+template<typename Real> class CuMatrix;
+template<typename Real> class CuVectorBase;
+template<typename Real> class CuSubVector;
+template<typename Real> class CuVector;
+template<typename Real> class CuPackedMatrix;
+template<typename Real> class CuSpMatrix;
+template<typename Real> class CuTpMatrix;
+
+class CompressedMatrix;
+
+/// This class provides a way for switching between double and float types.
+template<typename T> class OtherReal { };  // useful in reading+writing routines
+                                           // to switch double and float.
+/// A specialized class for switching from float to double.
+template<> class OtherReal<float> {
+ public:
+  typedef double Real;
+};
+/// A specialized class for switching from double to float.
+template<> class OtherReal<double> {
+ public:
+  typedef float Real;
+};
+
+
+typedef int32 MatrixIndexT;
+typedef int32 SignedMatrixIndexT;
+typedef uint32 UnsignedMatrixIndexT;
+
+// If you want to use size_t for the index type, do as follows instead:
+//typedef size_t MatrixIndexT;
+//typedef ssize_t SignedMatrixIndexT;
+//typedef size_t UnsignedMatrixIndexT;
+
+}
+
+
+
+#endif  // KALDI_MATRIX_MATRIX_COMMON_H_