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  // all functions also pass a payload void* pointer
  void* p_forward;
  void* p_backward;
  void* p_infer_shape;
  void* p_list_outputs;
  void* p_list_arguments;
  void* p_declare_backward_dependency;
};

/*!
 * \brief return str message of the last error
 *  all function in this file will return 0 when success
 *  and -1 when an error occured,
 *  MXGetLastError can be called to retrieve the error
 *
 *  this function is threadsafe and can be called by different thread
 *  \return error info
 */
const char *MXGetLastError();

//-------------------------------------
// Part 0: Global State setups
//-------------------------------------
/*!
 * \brief Seed the global random number generators in mxnet.
 * \param seed the random number seed.
 * \return 0 when success, -1 when failure happens.

mxnet.i  view on Meta::CPAN

                                 mx_uint *out_shape_size,
                                 const mx_uint **out_shape_ndim,
                                 const mx_uint ***out_shape_data,
                                 mx_uint *aux_shape_size,
                                 const mx_uint **aux_shape_ndim,
                                 const mx_uint ***aux_shape_data,
                                 int *out);
/*!
 * \brief partially infer shape of unknown input shapes given the known one.
 *
 *  Return partially inferred results if not all shapes could be inferred.
 *  The shapes are packed into a CSR matrix represented by arg_ind_ptr and arg_shape_data
 *  The call will be treated as a kwargs call if key != nullptr or num_args==0, otherwise it is positional.
 *
 * \param sym symbol handle
 * \param num_args numbe of input arguments.
 * \param keys the key of keyword args (optional)
 * \param arg_ind_ptr the head pointer of the rows in CSR
 * \param arg_shape_data the content of the CSR
 * \param in_shape_size sizeof the returning array of in_shapes
 * \param in_shape_ndim returning array of shape dimensions of eachs input shape.