tensor_copy.h

Go to the documentation of this file.

/***************************************************************************************************
 * Copyright (c) 2017-2019, NVIDIA CORPORATION.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright notice, this list of
 *       conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *     * Neither the name of the NVIDIA CORPORATION nor the names of its contributors may be used
 *       to endorse or promote products derived from this software without specific prior written
 *       permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TOR (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 **************************************************************************************************/
/* \file
  \brief Defines host-side elementwise operations on TensorView.
*/

#pragma once

// Standard Library includes
#include <utility>

// Cutlass includes
#include "cutlass/cutlass.h"
#include "tensor_foreach.h"

namespace cutlass {
namespace reference {
namespace host {


namespace detail {

template <
  typename DstElement,
  typename SrcElement
>
struct TrivialConvert {

  TrivialConvert() { }

  DstElement operator()(SrcElement src) const {
    return DstElement(src);
  }
};

template <
  typename DstElement,
  typename DstLayout,
  typename SrcElement,
  typename SrcLayout,
  typename F
>
struct TensorCopyIf {

  using DstTensorView = TensorView<DstElement, DstLayout>;
  using SrcTensorView = TensorView<SrcElement, SrcLayout>;

  //
  // Data members
  //

  DstTensorView dst;
  SrcTensorView src;
  F convert;

  //
  // Methods
  //

  TensorCopyIf() { }

  TensorCopyIf(
    DstTensorView const &dst_, 
    SrcTensorView const &src_,
    F const &convert_): dst(dst_), src(src_), convert(convert_) {}

  void operator()(Coord<DstLayout::kRank> const &coord) {
    if (dst.contains(coord) && src.contains(coord)) {
      dst.at(coord) = convert(src.at(coord));
    }
  }
};

} // namespace detail


template <
  typename DstElement,          
  typename DstLayout,           
  typename SrcElement,          
  typename SrcLayout,           
  typename F                    
>
void TensorCopy(
  TensorView<DstElement, DstLayout> dst,
  TensorView<SrcElement, SrcLayout> src,
  F const &transform) {

  using CopyIf = detail::TensorCopyIf<
    DstElement,
    DstLayout,
    SrcElement,
    SrcLayout,
    F>;

  CopyIf copy_if(dst, src, transform);

  TensorForEach(dst.extent(), copy_if);
}



template <
  typename DstElement,          
  typename DstLayout,           
  typename SrcElement,          
  typename SrcLayout,           
  typename F                    
>
void TensorCopy(
  TensorView<DstElement, DstLayout> dst,
  TensorRef<SrcElement, SrcLayout> src,
  F const &transform) {

  using CopyIf = detail::TensorCopyIf<
    DstElement,
    DstLayout,
    SrcElement,
    SrcLayout,
    F>;

  TensorView<SrcElement, SrcLayout> src_view(src, dst.extent());

  CopyIf copy_if(dst, src_view, transform);

  TensorForEach(dst.extent(), copy_if);
}

template <
  typename DstElement,          
  typename DstLayout,           
  typename SrcElement,          
  typename SrcLayout,           
  typename F                    
>
void TensorCopy(
  TensorRef<DstElement, DstLayout> dst,
  TensorView<SrcElement, SrcLayout> src,
  F const &transform) {

  using CopyIf = detail::TensorCopyIf<
    DstElement,
    DstLayout,
    SrcElement,
    SrcLayout,
    F>;

  TensorView<DstElement, DstLayout> dst_view(dst, src.extent());

  CopyIf copy_if(dst_view, src, transform);

  TensorForEach(src.extent(), copy_if);
}


template <
  typename DstElement,          
  typename DstLayout,           
  typename SrcElement,          
  typename SrcLayout            
>
void TensorCopy(
  TensorView<DstElement, DstLayout> dst,
  TensorView<SrcElement, SrcLayout> src) {

  detail::TrivialConvert<DstElement, SrcElement> convert;

  TensorCopy(dst, src, convert);
}


template <
  typename DstElement,          
  typename DstLayout,           
  typename SrcElement,          
  typename SrcLayout,           
  typename F                    
>
void TensorCopy(
  TensorView<DstElement, DstLayout> dst,
  TensorRef<SrcElement, SrcLayout> src) {

  detail::TrivialConvert<DstElement, SrcElement> convert;

  TensorCopy(dst, src, convert);
}


template <
  typename DstElement,          
  typename DstLayout,           
  typename SrcElement,          
  typename SrcLayout            
>
void TensorCopy(
  TensorRef<DstElement, DstLayout> dst,
  TensorView<SrcElement, SrcLayout> src) {

  detail::TrivialConvert<DstElement, SrcElement> convert;

  TensorCopy(dst, src, convert);
}


} // namespace host
} // namespace reference
} // namespace cutlass