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Added ability to print a tensor using an iostream.

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This commit is contained in:
Benoit Steiner
2014-10-10 16:17:26 -07:00
parent 2ed1838aeb
commit 0219f8aed4
4 changed files with 117 additions and 0 deletions
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2
unsupported/Eigen/CXX11/Tensor
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@@ -64,6 +64,8 @@
#include "unsupported/Eigen/CXX11/src/Tensor/TensorFixedSize.h"
#include "unsupported/Eigen/CXX11/src/Tensor/TensorMap.h"
#include "unsupported/Eigen/CXX11/src/Tensor/TensorIO.h"
#include "Eigen/src/Core/util/ReenableStupidWarnings.h"
#endif // EIGEN_CXX11_TENSOR_MODULE

44
unsupported/Eigen/CXX11/src/Tensor/TensorIO.h Normal file
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@@ -0,0 +1,44 @@
// 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_IO_H
#define EIGEN_CXX11_TENSOR_TENSOR_IO_H
namespace Eigen {
template <typename T>
std::ostream& operator << (std::ostream& os, const TensorBase<T, ReadOnlyAccessors>& expr) {
// Evaluate the expression if needed
TensorForcedEvalOp<const T> eval = expr.eval();
TensorEvaluator<const TensorForcedEvalOp<const T>, DefaultDevice> tensor(eval, DefaultDevice());
tensor.evalSubExprsIfNeeded(NULL);
typedef typename T::Scalar Scalar;
typedef typename T::Index Index;
typedef typename TensorEvaluator<const TensorForcedEvalOp<const T>, DefaultDevice>::Dimensions Dimensions;
const Index total_size = internal::array_prod(tensor.dimensions());
// Print the tensor as a 1d vector or a 2d matrix.
if (internal::array_size<Dimensions>::value == 1) {
Map<Array<Scalar, Dynamic, 1> > array(tensor.data(), total_size);
os << array;
} else {
const Index first_dim = tensor.dimensions()[0];
Map<Array<Scalar, Dynamic, Dynamic> > matrix(tensor.data(), first_dim, total_size/first_dim);
os << matrix;
}
// Cleanup.
tensor.cleanup();
return os;
}
} // end namespace Eigen
#endif // EIGEN_CXX11_TENSOR_TENSOR_IO_H