#ifndef THIRD_PARTY_TENSORFLOW_CORE_KERNELS_TRANSPOSE_OP_FUNCTOR_H_
#define THIRD_PARTY_TENSORFLOW_CORE_KERNELS_TRANSPOSE_OP_FUNCTOR_H_

#include "third_party/eigen3/unsupported/Eigen/CXX11/Tensor"
#include "tensorflow/core/framework/tensor_types.h"

namespace tensorflow {
namespace functor {

template <typename Device, typename T, int NDIMS>
void Transpose(const Device& d, typename TTypes<T, NDIMS>::Tensor out,
               typename TTypes<T, NDIMS>::ConstTensor in, const int* perm) {
  // perm[] is a permutation of 0, 1, ..., NDIMS-1. perm[] is on CPU.
  Eigen::array<int, NDIMS> p;
  for (int i = 0; i < NDIMS; ++i) p[i] = perm[i];
  out.device(d) = in.shuffle(p);
}

template <typename Device, typename T, int NDIMS>
struct TransposeFunctor {
  void operator()(const Device& d, typename TTypes<T, NDIMS>::Tensor out,
                  typename TTypes<T, NDIMS>::ConstTensor in, const int* perm);
};

}  // namespace functor
}  // namespace tensorflow

#endif  // THIRD_PARTY_TENSORFLOW_CORE_KERNELS_TRANSPOSE_OP_FUNCTOR_H_