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                             NDArrayHandle *out);
/*!
 * \brief Index the NDArray along axis 0.
 * \param handle the handle to the NDArray
 * \param idx the index
 * \param out The NDArrayHandle of output NDArray
 * \return 0 when success, -1 when failure happens
 */
int MXNDArrayAt(NDArrayHandle handle,
                          mx_uint idx,
                          NDArrayHandle *out);
/*!
 * \brief Reshape the NDArray.
 * \param handle the handle to the ndarray
 * \param ndim number of dimensions of new shape
 * \param dims new shape
 * \param out the NDArrayHandle of reshaped NDArray
 * \return 0 when success, -1 when failure happens
 */
int MXNDArrayReshape(NDArrayHandle handle,
                               int ndim,
                               int *in,
                               NDArrayHandle *out);
/*!
 * \brief get the shape of the array
 * \param handle the handle to the ndarray
 * \param out_dim the output dimension
 * \param out_pdata pointer holder to get data pointer of the shape
 * \return 0 when success, -1 when failure happens
 */
int MXNDArrayGetShape(NDArrayHandle handle,
                                mx_uint *out_dim,
                                const mx_uint **out_pdata);
/*!
 * \brief get the content of the data in NDArray
 * \param handle the handle to the ndarray
 * \param out_pdata pointer holder to get pointer of data
 * \return 0 when success, -1 when failure happens
 */
int MXNDArrayGetData(NDArrayHandle handle,
                                void **out_pdata);
/*!
 * \brief get the type of the data in NDArray
 * \param handle the handle to the ndarray
 * \param out_dtype pointer holder to get type of data
 * \return 0 when success, -1 when failure happens
 */
int MXNDArrayGetDType(NDArrayHandle handle,
                               int *out);
/*!
 * \brief get the context of the NDArray
 * \param handle the handle to the ndarray
 * \param out_dev_type the output device type
 * \param out_dev_id the output device id
 * \return 0 when success, -1 when failure happens
 */
int MXNDArrayGetContext(NDArrayHandle handle,
                                  int *out,
                                  int *out);
/*!
 * \brief return gradient buffer attached to this NDArray
 * \param handle NDArray handle
 * \return 0 when success, -1 when failure happens
 */
int MXNDArrayGetGrad(NDArrayHandle handle, NDArrayHandle *out);

/*!
 * \brief detach and ndarray from computation graph by clearing entry_
 * \param handle NDArray handle
 * \return 0 when success, -1 when failure happens
 */
int MXNDArrayDetach(NDArrayHandle handle, NDArrayHandle *out);

/*!
 * \brief set the flag for gradient array state.
 * \param handle NDArray handle
 * \param state the new state.
 * \return 0 when success, -1 when failure happens
 */
int MXNDArraySetGradState(NDArrayHandle handle, int state);

/*!
 * \brief set the flag for gradient array state.
 * \param handle NDArray handle
 * \param state the new state.
 * \return 0 when success, -1 when failure happens
 */
int MXNDArrayGetGradState(NDArrayHandle handle, int *out);

//--------------------------------
// Part 2: functions on NDArray
//--------------------------------
/*!
 * \brief list all the available functions handles
 *   most user can use it to list all the needed functions
 * \param out_size the size of returned array
 * \param out_array the output function array
 * \return 0 when success, -1 when failure happens
 */
int MXListFunctions(mx_uint *out_size,
                              FunctionHandle **out_array);
/*!
 * \brief get the function handle by name
 * \param name the name of the function
 * \param out the corresponding function handle
 * \return 0 when success, -1 when failure happens
 */
int MXGetFunction(const char *name,
                            FunctionHandle *out);
/*!
 * \brief Get the information of the function handle.
 * \param fun The function handle.
 * \param name The returned name of the function.
 * \param description The returned description of the function.
 * \param num_args Number of arguments.
 * \param arg_names Name of the arguments.
 * \param arg_type_infos Type information about the arguments.
 * \param arg_descriptions Description information about the arguments.
 * \param return_type Return type of the function.
 * \return 0 when success, -1 when failure happens
 */