cu-packed-matrix.h

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// cudamatrix/cu-packed-matrix.h

// Copyright 2009-2013  Johns Hopkins University (author: Daniel Povey)
//                      Karel Vesely

// 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_CUDAMATRIX_CU_PACKED_MATRIX_H_
#define KALDI_CUDAMATRIX_CU_PACKED_MATRIX_H_

#include <sstream>

#include "cudamatrix/cu-common.h"
#include "cudamatrix/cu-value.h"
#include "matrix/matrix-common.h"
#include "matrix/kaldi-matrix.h"
#include "matrix/packed-matrix.h"
#include "matrix/sp-matrix.h"
#include "cudamatrix/cu-array.h"
#include "cudamatrix/cu-math.h"
#include "cudamatrix/cu-matrix.h"

namespace kaldi {


template<typename Real>
class CuPackedMatrix {
 public:
  friend class CuMatrixBase<Real>;
  friend class CuVectorBase<Real>;
  friend class CuSubMatrix<Real>;
  friend class CuRand<Real>;
  
  CuPackedMatrix() : data_(NULL), num_rows_(0) {}

  explicit CuPackedMatrix(MatrixIndexT r,
                          MatrixResizeType resize_type = kSetZero):
      data_(NULL), num_rows_(0) {  Resize(r, resize_type);  }
  
  explicit CuPackedMatrix(const PackedMatrix<Real> &orig) : data_(NULL), num_rows_(0) {
    Resize(orig.num_rows_, kUndefined);
    CopyFromPacked(orig);
  }

  explicit CuPackedMatrix(const CuPackedMatrix<Real> &orig) : data_(NULL), num_rows_(0) {
    Resize(orig.NumRows(), kUndefined);
    CopyFromPacked(orig);
  }

  void SetZero();  
  void SetUnit();  
  void SetRandn(); 
  void SetDiag(Real alpha); 
  void AddToDiag(Real r); 

  void Scale(Real alpha); 
  void ScaleDiag(Real alpha);
  Real Trace() const;

  ~CuPackedMatrix() { Destroy(); }

  void Resize(MatrixIndexT nRows, MatrixResizeType resize_type = kSetZero);
  
  // Copy functions (do not resize).
  void CopyFromPacked(const CuPackedMatrix<Real> &src);
  void CopyFromPacked(const PackedMatrix<Real> &src);
  void CopyToPacked(PackedMatrix<Real> *dst) const;

  void Read(std::istream &in, bool binary);
  
  void Write(std::ostream &out, bool binary) const;

  void Destroy();
  
  void Swap(CuPackedMatrix<Real> *other);

  void Swap(PackedMatrix<Real> *other);
  Real* Data() { return data_; }  
  const Real* Data() const { return data_; }
  
  inline Real operator() (MatrixIndexT r, MatrixIndexT c) const {
    if (static_cast<UnsignedMatrixIndexT>(c) >
        static_cast<UnsignedMatrixIndexT>(r))
      std::swap(c, r);
    KALDI_ASSERT(static_cast<UnsignedMatrixIndexT>(r) <
                 static_cast<UnsignedMatrixIndexT>(this->num_rows_));
#if HAVE_CUDA == 1
    if (CuDevice::Instantiate().Enabled()) {    
      Real value;
      CU_SAFE_CALL(cudaMemcpyAsync(&value, this->data_ + (r * (r+1)) / 2 + c,
                                   sizeof(Real), cudaMemcpyDeviceToHost,
                                   cudaStreamPerThread));
      CU_SAFE_CALL(cudaStreamSynchronize(cudaStreamPerThread));
      return value;
    } else
#endif
    return this->data_[(r * (r+1)) / 2 + c];
  }

  inline MatrixIndexT NumRows() const { return num_rows_; }
  inline MatrixIndexT NumCols() const { return num_rows_; }

  size_t  SizeInBytes() const {
    size_t nr = static_cast<size_t>(num_rows_),
      num_bytes = ((nr * (nr+1)) / 2) * sizeof(Real);
    return num_bytes;
  }


 protected:
  // The following two functions should only be called if we did not compile with CUDA
  // or could not get a CUDA card; in that case the contents are interpreted the   
  // same as a regular matrix.                                                                      
  inline const PackedMatrix<Real> &Mat() const {
    return *(reinterpret_cast<const PackedMatrix<Real>* >(this));
  }
  inline PackedMatrix<Real> &Mat() {
    return *(reinterpret_cast<PackedMatrix<Real>* >(this));
  }

  
  // Will only be called from this class or derived classes.

  Real *data_;
  MatrixIndexT num_rows_;
  void AddPacked(const Real alpha, const CuPackedMatrix<Real> &M);

 private:
  // Disallow assignment.
  PackedMatrix<Real> & operator=(const PackedMatrix<Real> &other);
}; // class CuPackedMatrix


template<typename Real>
std::ostream &operator << (std::ostream &out, const CuPackedMatrix<Real> &mat);

} // namespace


#endif