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// See docs in ../ops/linalg_ops.cc.
#include <cmath>
#include "tensorflow/core/framework/kernel_def_builder.h"
#include "tensorflow/core/framework/op_kernel.h"
#include "tensorflow/core/kernels/linalg_ops_common.h"
#include "tensorflow/core/lib/core/errors.h"
#include "tensorflow/core/platform/logging.h"
#include "tensorflow/core/platform/port.h"
#include "tensorflow/core/public/tensor_shape.h"
#include "third_party/eigen3/Eigen/LU"
namespace tensorflow {
template <class Scalar, bool SupportsBatchOperationT>
class DeterminantOp : public LinearAlgebraOp<Scalar, SupportsBatchOperationT> {
public:
explicit DeterminantOp(OpKernelConstruction* context)
: LinearAlgebraOp<Scalar, SupportsBatchOperationT>(context) {}
~DeterminantOp() override {}
TensorShape GetOutputMatrixShape(
const TensorShape& input_matrix_shape) override {
return TensorShape({});
}
int64 GetCostPerUnit(const TensorShape& input_matrix_shape) override {
const int64 rows = input_matrix_shape.dim_size(0);
if (rows > (1LL << 20)) {
// A big number to cap the cost in case overflow.
return kint32max;
} else {
return rows * rows * rows;
}
}
using typename LinearAlgebraOp<Scalar, SupportsBatchOperationT>::MatrixMap;
using
typename LinearAlgebraOp<Scalar, SupportsBatchOperationT>::ConstMatrixMap;
void ComputeMatrix(OpKernelContext* context, const ConstMatrixMap& input,
MatrixMap* output) override {
OP_REQUIRES(context, input.rows() == input.cols(),
errors::InvalidArgument("Input matrix must be square."));
Scalar determinant;
if (input.rows() == 0) {
// An empty matrix' determinant is defined to be 1. See
// wikipedia.
determinant = 1;
} else {
determinant = input.determinant();
}
OP_REQUIRES(context, std::isfinite(determinant),
errors::Internal("The determinant is not finite."));
(*output)(0, 0) = determinant;
}
};
REGISTER_LINALG_OP("MatrixDeterminant", (DeterminantOp<float, false>), float);
REGISTER_LINALG_OP("MatrixDeterminant", (DeterminantOp<double, false>), double);
REGISTER_LINALG_OP("BatchMatrixDeterminant", (DeterminantOp<float, true>),
float);
REGISTER_LINALG_OP("BatchMatrixDeterminant", (DeterminantOp<double, true>),
double);
} // namespace tensorflow
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