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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2014 Benoit Steiner <benoit.steiner.goog@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef EIGEN_CXX11_TENSOR_TENSOR_DEVICE_H
#define EIGEN_CXX11_TENSOR_TENSOR_DEVICE_H
namespace Eigen {
/** \class TensorDevice
* \ingroup CXX11_Tensor_Module
*
* \brief Pseudo expression providing an operator = that will evaluate its argument
* on the specified computing 'device' (GPU, thread pool, ...)
*
* Example:
* C.device(EIGEN_GPU) = A + B;
*
* Todo: operator *= and /=.
*/
template <typename ExpressionType, typename DeviceType> class TensorDevice {
public:
TensorDevice(const DeviceType& device, ExpressionType& expression) : m_device(device), m_expression(expression) {}
EIGEN_DEFAULT_COPY_CONSTRUCTOR(TensorDevice)
template<typename OtherDerived>
EIGEN_STRONG_INLINE TensorDevice& operator=(const OtherDerived& other) {
typedef TensorAssignOp<ExpressionType, const OtherDerived> Assign;
Assign assign(m_expression, other);
internal::TensorExecutor<const Assign, DeviceType>::run(assign, m_device);
return *this;
}
template<typename OtherDerived>
EIGEN_STRONG_INLINE TensorDevice& operator+=(const OtherDerived& other) {
typedef typename OtherDerived::Scalar Scalar;
typedef TensorCwiseBinaryOp<internal::scalar_sum_op<Scalar>, const ExpressionType, const OtherDerived> Sum;
Sum sum(m_expression, other);
typedef TensorAssignOp<ExpressionType, const Sum> Assign;
Assign assign(m_expression, sum);
internal::TensorExecutor<const Assign, DeviceType>::run(assign, m_device);
return *this;
}
template<typename OtherDerived>
EIGEN_STRONG_INLINE TensorDevice& operator-=(const OtherDerived& other) {
typedef typename OtherDerived::Scalar Scalar;
typedef TensorCwiseBinaryOp<internal::scalar_difference_op<Scalar>, const ExpressionType, const OtherDerived> Difference;
Difference difference(m_expression, other);
typedef TensorAssignOp<ExpressionType, const Difference> Assign;
Assign assign(m_expression, difference);
internal::TensorExecutor<const Assign, DeviceType>::run(assign, m_device);
return *this;
}
protected:
const DeviceType& m_device;
ExpressionType& m_expression;
};
/** \class TensorAsyncDevice
* \ingroup CXX11_Tensor_Module
*
* \brief Pseudo expression providing an operator = that will evaluate its
* argument asynchronously on the specified device. Currently only
* ThreadPoolDevice implements proper asynchronous execution, while the default
* and GPU devices just run the expression synchronously and call m_done() on
* completion..
*
* Example:
* auto done = []() { ... expression evaluation done ... };
* C.device(thread_pool_device, std::move(done)) = A + B;
*/
template <typename ExpressionType, typename DeviceType, typename DoneCallback>
class TensorAsyncDevice {
public:
TensorAsyncDevice(const DeviceType& device, ExpressionType& expression,
DoneCallback done)
: m_device(device), m_expression(expression), m_done(std::move(done)) {}
template <typename OtherDerived>
EIGEN_STRONG_INLINE TensorAsyncDevice& operator=(const OtherDerived& other) {
typedef TensorAssignOp<ExpressionType, const OtherDerived> Assign;
typedef internal::TensorExecutor<const Assign, DeviceType> Executor;
Assign assign(m_expression, other);
Executor::run(assign, m_device);
m_done();
return *this;
}
protected:
const DeviceType& m_device;
ExpressionType& m_expression;
DoneCallback m_done;
};
#ifdef EIGEN_USE_THREADS
template <typename ExpressionType, typename DoneCallback>
class TensorAsyncDevice<ExpressionType, ThreadPoolDevice, DoneCallback> {
public:
TensorAsyncDevice(const ThreadPoolDevice& device, ExpressionType& expression,
DoneCallback done)
: m_device(device), m_expression(expression), m_done(std::move(done)) {}
template <typename OtherDerived>
EIGEN_STRONG_INLINE TensorAsyncDevice& operator=(const OtherDerived& other) {
typedef TensorAssignOp<ExpressionType, const OtherDerived> Assign;
typedef internal::TensorAsyncExecutor<const Assign, ThreadPoolDevice, DoneCallback> Executor;
// WARNING: After assignment 'm_done' callback will be in undefined state.
Assign assign(m_expression, other);
Executor::runAsync(assign, m_device, std::move(m_done));
return *this;
}
protected:
const ThreadPoolDevice& m_device;
ExpressionType& m_expression;
DoneCallback m_done;
};
#endif
} // end namespace Eigen
#endif // EIGEN_CXX11_TENSOR_TENSOR_DEVICE_H
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