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 * \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
 */