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Fixed the printing of rank-0 tensors

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This commit is contained in:
Benoit Steiner 2016-06-20 10:46:45 -07:00
parent b055590e91
commit de32f8d656
2 changed files with 62 additions and 22 deletions
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66
unsupported/Eigen/CXX11/src/Tensor/TensorIO.h
View File

@ -17,34 +17,58 @@ template<>
struct significant_decimals_impl<std::string>
: significant_decimals_default_impl<std::string, true>
{};
}
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 internal::remove_const<typename T::Scalar>::type Scalar;
typedef typename T::Index Index;
typedef typename TensorEvaluator<const TensorForcedEvalOp<const T>, DefaultDevice>::Dimensions Dimensions;
// Print the tensor as a 2d matrix
template <typename Tensor, int Rank>
struct TensorPrinter {
static void run (std::ostream& os, const Tensor& tensor) {
typedef typename internal::remove_const<typename Tensor::Scalar>::type Scalar;
typedef typename Tensor::Index Index;
const Index total_size = internal::array_prod(tensor.dimensions());
// Print the tensor as a 1d vector or a 2d matrix.
static const int rank = internal::array_size<Dimensions>::value;
if (rank == 0) {
os << tensor.coeff(0);
} else if (rank == 1) {
Map<const Array<Scalar, Dynamic, 1> > array(const_cast<Scalar*>(tensor.data()), total_size);
os << array;
} else {
const Index first_dim = Eigen::internal::array_get<0>(tensor.dimensions());
static const int layout = TensorEvaluator<const TensorForcedEvalOp<const T>, DefaultDevice>::Layout;
static const int layout = Tensor::Layout;
Map<const Array<Scalar, Dynamic, Dynamic, layout> > matrix(const_cast<Scalar*>(tensor.data()), first_dim, total_size/first_dim);
os << matrix;
}
};
// Print the tensor as a vector
template <typename Tensor>
struct TensorPrinter<Tensor, 1> {
static void run (std::ostream& os, const Tensor& tensor) {
typedef typename internal::remove_const<typename Tensor::Scalar>::type Scalar;
typedef typename Tensor::Index Index;
const Index total_size = internal::array_prod(tensor.dimensions());
Map<const Array<Scalar, Dynamic, 1> > array(const_cast<Scalar*>(tensor.data()), total_size);
os << array;
}
};
// Print the tensor as a scalar
template <typename Tensor>
struct TensorPrinter<Tensor, 0> {
static void run (std::ostream& os, const Tensor& tensor) {
os << tensor.coeff(0);
}
};
}
template <typename T>
std::ostream& operator << (std::ostream& os, const TensorBase<T, ReadOnlyAccessors>& expr) {
typedef TensorEvaluator<const TensorForcedEvalOp<const T>, DefaultDevice> Evaluator;
typedef typename Evaluator::Dimensions Dimensions;
// Evaluate the expression if needed
TensorForcedEvalOp<const T> eval = expr.eval();
Evaluator tensor(eval, DefaultDevice());
tensor.evalSubExprsIfNeeded(NULL);
// Print the result
static const int rank = internal::array_size<Dimensions>::value;
internal::TensorPrinter<Evaluator, rank>::run(os, tensor);
// Cleanup.
tensor.cleanup();

16
unsupported/test/cxx11_tensor_io.cpp
View File

@ -13,6 +13,20 @@
#include <Eigen/CXX11/Tensor>
template<int DataLayout>
static void test_output_0d()
{
Tensor<int, 0, DataLayout> tensor;
tensor() = 123;
std::stringstream os;
os << tensor;
std::string expected("123");
VERIFY_IS_EQUAL(std::string(os.str()), expected);
}
template<int DataLayout>
static void test_output_1d()
{
@ -101,6 +115,8 @@ static void test_output_const()
void test_cxx11_tensor_io()
{
CALL_SUBTEST(test_output_0d<ColMajor>());
CALL_SUBTEST(test_output_0d<RowMajor>());
CALL_SUBTEST(test_output_1d<ColMajor>());
CALL_SUBTEST(test_output_1d<RowMajor>());
CALL_SUBTEST(test_output_2d<ColMajor>());