text: #pragma once
  
  // Indexing tensors by by tensors
  
  #include <ATen/ATen.h>
  #include <ATen/native/DispatchStub.h>
  
  namespace at {
    struct TensorIterator;
  }
  
  namespace at { namespace native {
  
  enum class SCATTER_GATHER_OP: uint8_t {REDUCE_ADD, REDUCE_MULTIPLY};
  
  using index_fn = void(*)(TensorIterator &, IntArrayRef indexed_sizes, IntArrayRef indexed_strides);
  using index_fill_fn = void(*)(TensorIterator & iter, int64_t dim, int64_t self_dim_size, int64_t self_dim_stride, Scalar source);
  using index_put_fn = void(*)(TensorIterator &, IntArrayRef indexed_sizes, IntArrayRef indexed_strides, bool accumulate);
  using index_put_accum_fn = void(*)(Tensor &, const c10::List<c10::optional<Tensor>> &, const Tensor &, bool unsafe);
  using masked_fill_fn = void(*)(TensorIterator &, Scalar scalar);
  using masked_select_fn = void(*)(TensorIterator &, int64_t orig_stride);
  using masked_scatter_fn = void(*)(TensorIterator &, const Tensor &);
  
  using gather_fn = void (*)(Tensor & result, const Tensor & self, int64_t dim, const Tensor & index);
  using scatter_fn = void(*)(Tensor& self, int64_t dim, const Tensor& index, const Tensor& src);
  using scatter_fill_fn = void(*)(Tensor& self, int64_t dim, const Tensor& index, Scalar src);
  using scatter_add_fn = void(*)(Tensor& self, int64_t dim, const Tensor& index, const Tensor& src);
  using scatter_reduce_fn = void(*)(Tensor& self, const int64_t dim, const Tensor& index,
                                    const Tensor& src, const SCATTER_GATHER_OP& reduce);
  using scatter_scalar_reduce_fn = void(*)(Tensor& self, const int64_t dim, const Tensor& index,
                                           Scalar& value, const SCATTER_GATHER_OP& reduce);
  
  DECLARE_DISPATCH(index_fn, index_stub);
  DECLARE_DISPATCH(index_fill_fn, index_fill_stub);
  DECLARE_DISPATCH(index_put_fn, index_put_stub);
  DECLARE_DISPATCH(index_put_accum_fn, index_put_accum_stub);
  DECLARE_DISPATCH(masked_fill_fn, masked_fill_stub);
  DECLARE_DISPATCH(masked_select_fn, masked_select_serial_stub);
  DECLARE_DISPATCH(masked_select_fn, masked_select_stub);
  DECLARE_DISPATCH(masked_scatter_fn, masked_scatter_stub);
  
  DECLARE_DISPATCH(gather_fn, gather_stub);
  DECLARE_DISPATCH(scatter_fn, scatter_stub);
  DECLARE_DISPATCH(scatter_fill_fn, scatter_fill_stub);
  DECLARE_DISPATCH(scatter_add_fn, scatter_add_stub);
  DECLARE_DISPATCH(scatter_reduce_fn, scatter_reduce_stub);
  DECLARE_DISPATCH(scatter_scalar_reduce_fn, scatter_scalar_reduce_stub);
  
  TORCH_API Tensor& index_out(Tensor& result, const Tensor & self, const c10::List<c10::optional<at::Tensor>>& indices);
  
  }} // namespace at::native
  