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 * \param out_name_size size of output name arrray.
 * \param out_names the names of returning NDArrays, can be NULL
 * \return 0 when success, -1 when failure happens
 */
int MXNDArrayLoad(const char* fname,
                            mx_uint *out_size,
                            NDArrayHandle** out_array,
                            mx_uint *out_size,
                            const char*** out_array);
/*!
 * \brief Perform a synchronize copy from a continugous CPU memory region.
 *
 *  This function will call WaitToWrite before the copy is performed.
 *  This is useful to copy data from existing memory region that are
 *  not wrapped by NDArray(thus dependency not being tracked).
 *
 * \param handle the NDArray handle
 * \param data the data source to copy from.
 * \param size the memory size we want to copy from.
 */
int MXNDArraySyncCopyFromCPU(NDArrayHandle handle,
                                       const void *in,
                                       size_t size);
/*!
 * \brief Perform a synchronize copy to a continugous CPU memory region.
 *
 *  This function will call WaitToRead before the copy is performed.
 *  This is useful to copy data from existing memory region that are
 *  not wrapped by NDArray(thus dependency not being tracked).
 *
 * \param handle the NDArray handle
 * \param data the data source to copy into.
 * \param size the memory size we want to copy into.
 */
int MXNDArraySyncCopyToCPU(NDArrayHandle handle,
                                     void *in,
                                     size_t size);
/*!
 * \brief Wait until all the pending writes with respect NDArray are finished.
 *  Always call this before read data out synchronizely.
 * \param handle the NDArray handle
 * \return 0 when success, -1 when failure happens
 */
int MXNDArrayWaitToRead(NDArrayHandle handle);
/*!
 * \brief Wait until all the pending read/write with respect NDArray are finished.
 *  Always call this before write data into NDArray synchronizely.
 * \param handle the NDArray handle
 * \return 0 when success, -1 when failure happens
 */
int MXNDArrayWaitToWrite(NDArrayHandle handle);
/*!
 * \brief wait until all delayed operations in
 *   the system is completed
 * \return 0 when success, -1 when failure happens
 */
int MXNDArrayWaitAll();