c_api.h

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

#ifndef MXNET_C_API_H_
#define MXNET_C_API_H_

#ifdef __cplusplus
extern "C" {
#endif  // __cplusplus

#ifdef __cplusplus
#define DEFAULT(x) = x
#else
#define DEFAULT(x)
#endif  // __cplusplus

#include <stdint.h>

#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>

#ifdef _WIN32
#ifdef MXNET_EXPORTS
#define MXNET_DLL __declspec(dllexport)
#else
#define MXNET_DLL __declspec(dllimport)
#endif
#else
#define MXNET_DLL
#endif

typedef uint32_t mx_uint;
typedef float mx_float;
typedef int64_t dim_t;
// all the handles are simply void *
// will be casted internally to specific pointers types
// these typedefs are mainly used for readablity reasons
typedef void *NDArrayHandle;
typedef const void *FunctionHandle;
typedef void *AtomicSymbolCreator;
typedef void *CachedOpHandle;
typedef void *SymbolHandle;
typedef void *AtomicSymbolHandle;
typedef void *ExecutorHandle;
typedef void *DataIterCreator;
typedef void *DataIterHandle;
typedef void *KVStoreHandle;
typedef void *RecordIOHandle;
typedef void *RtcHandle;
typedef void *CudaModuleHandle;
typedef void *CudaKernelHandle;
typedef void *ProfileHandle;
typedef void *DLManagedTensorHandle;
typedef const void *ContextHandle;
typedef const void *EngineFnPropertyHandle;
typedef void *EngineVarHandle;

typedef void (*EngineAsyncFunc)(void*, void*, void*);
typedef void (*EngineSyncFunc)(void*, void*);
typedef void (*EngineFuncParamDeleter)(void*);
typedef void (*ExecutorMonitorCallback)(const char*,
                                        NDArrayHandle,
                                        void*);
typedef void (*CachedOpMonitorCallback)(const char*,
                                        const char*,
                                        NDArrayHandle);


struct NativeOpInfo {
  void (*forward)(int, float**, int*, unsigned**, int*, void*);
  void (*backward)(int, float**, int*, unsigned**, int*, void*);
  void (*infer_shape)(int, int*, unsigned**, void*);
  void (*list_outputs)(char***, void*);
  void (*list_arguments)(char***, void*);
  // 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;
};

struct NDArrayOpInfo {
  bool (*forward)(int, void**, int*, void*);
  bool (*backward)(int, void**, int*, void*);
  bool (*infer_shape)(int, int*, unsigned**, void*);
  bool (*list_outputs)(char***, void*);
  bool (*list_arguments)(char***, void*);
  bool (*declare_backward_dependency)(const int*, const int*, const int*,
                                      int*, int**, void*);
  // 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;
};

typedef int (*MXGenericCallback)(void);

struct MXCallbackList {
  int num_callbacks;
  int (**callbacks)(void);
  void **contexts;
};

struct LibFeature {
  const char* name;
  bool enabled;
};

enum CustomOpCallbacks {
  kCustomOpDelete,
  kCustomOpForward,
  kCustomOpBackward
};

enum CustomOpPropCallbacks {
  kCustomOpPropDelete,
  kCustomOpPropListArguments,
  kCustomOpPropListOutputs,
  kCustomOpPropListAuxiliaryStates,
  kCustomOpPropInferShape,
  kCustomOpPropDeclareBackwardDependency,
  kCustomOpPropCreateOperator,
  kCustomOpPropInferType,
  kCustomOpPropInferStorageType,
  kCustomOpPropBackwardInferStorageType
};


typedef int (*CustomOpFBFunc)(int /*size*/, void** /*ptrs*/, int* /*tags*/,
                              const int* /*reqs*/, const int /*is_train*/,
                              void* /*state*/);
typedef int (*CustomOpDelFunc)(void* /*state*/);
typedef int (*CustomOpListFunc)(char*** /*args*/, void* /*state*/);
typedef int (*CustomOpInferShapeFunc)(int /*num_input*/, int* /*ndims*/,
                                      int** /*shapes*/, void* /*state*/);
typedef int (*CustomOpInferStorageTypeFunc)(int /*num_input*/, int* /*stypes*/, void* /*state*/);
typedef int (*CustomOpBackwardInferStorageTypeFunc)(int /*num_input*/,
                                                    int * /*stypes*/,
                                                    int * /*tags*/,
                                                    void * /*state*/);
typedef int (*CustomOpInferTypeFunc)(int /*num_input*/, int* /*types*/, void* /*state*/);
typedef int (*CustomOpBwdDepFunc)(const int* /*out_grad*/, const int* /*in_data*/,
                                  const int* /*out_data*/, int* /*num_deps*/,
                                  int** /*rdeps*/, void* /*state*/);
typedef int (*CustomOpCreateFunc)(const char* /*ctx*/, int /*num_inputs*/,
                                  unsigned** /*shapes*/, const int* /*ndims*/,
                                  const int* /*dtypes*/, struct MXCallbackList* /*ret*/,
                                  void* /*state*/);
typedef int (*CustomOpPropCreator)(const char* /*op_type*/, const int /*num_kwargs*/,
                                   const char** /*keys*/, const char** /*values*/,
                                   struct MXCallbackList* /*ret*/);


enum CustomFunctionCallbacks {
  kCustomFunctionBackward,
  kCustomFunctionDelete
};

typedef int (*CustomFunctionBwdFunc)(int /*num_ograds*/, int /*num_igrads*/, void** /*ptrs*/,
                                     const int* /*reqs*/, const int /*is_train*/,
                                     void* /*state*/);
typedef int (*CustomFunctionDelFunc)(void* /*state*/);

MXNET_DLL const char *MXGetLastError();

//-------------------------------------
// Part 0: Global State setups
//-------------------------------------

MXNET_DLL int MXLoadLib(const char *path, unsigned verbose);

MXNET_DLL int MXLibInfoFeatures(const struct LibFeature **libFeature, size_t *size);

MXNET_DLL int MXRandomSeed(int seed);

MXNET_DLL int MXRandomSeedContext(int seed, int dev_type, int dev_id);

MXNET_DLL int MXNotifyShutdown();

MXNET_DLL int MXSetProcessProfilerConfig(int num_params, const char* const* keys,
                                         const char* const* vals,
                                         KVStoreHandle kvstoreHandle);

MXNET_DLL int MXSetProfilerConfig(int num_params, const char* const* keys, const char* const* vals);

MXNET_DLL int MXSetProcessProfilerState(int state, int profile_process,
                                        KVStoreHandle kvStoreHandle);

MXNET_DLL int MXSetProfilerState(int state);

MXNET_DLL int MXDumpProcessProfile(int finished, int profile_process, KVStoreHandle kvStoreHandle);


MXNET_DLL int MXDumpProfile(int finished);


MXNET_DLL int MXAggregateProfileStatsPrint(const char **out_str, int reset);

MXNET_DLL int MXAggregateProfileStatsPrintEx(const char **out_str, int reset, int format,
                                            int sort_by, int ascending);

MXNET_DLL int MXProcessProfilePause(int paused, int profile_process, KVStoreHandle kvStoreHandle);

MXNET_DLL int MXProfilePause(int paused);

MXNET_DLL int MXProfileCreateDomain(const char *domain, ProfileHandle *out);

MXNET_DLL int MXProfileCreateTask(ProfileHandle domain,
                                  const char *task_name,
                                  ProfileHandle *out);

MXNET_DLL int MXProfileCreateFrame(ProfileHandle domain,
                                   const char *frame_name,
                                   ProfileHandle *out);

MXNET_DLL int MXProfileCreateEvent(const char *event_name, ProfileHandle *out);

MXNET_DLL int MXProfileCreateCounter(ProfileHandle domain,
                                     const char *counter_name,
                                     ProfileHandle *out);

MXNET_DLL int MXProfileDestroyHandle(ProfileHandle frame_handle);

MXNET_DLL int MXProfileDurationStart(ProfileHandle duration_handle);

MXNET_DLL int MXProfileDurationStop(ProfileHandle duration_handle);

MXNET_DLL int MXProfileSetCounter(ProfileHandle counter_handle, uint64_t value);

MXNET_DLL int MXProfileAdjustCounter(ProfileHandle counter_handle, int64_t value);

MXNET_DLL int MXProfileSetMarker(ProfileHandle domain,
                                 const char *instant_marker_name,
                                 const char *scope);

MXNET_DLL int MXSetNumOMPThreads(int thread_num);

MXNET_DLL int MXEngineSetBulkSize(int bulk_size, int* prev_bulk_size);

MXNET_DLL int MXGetGPUCount(int* out);

MXNET_DLL int MXGetGPUMemoryInformation(int dev, int *free_mem, int *total_mem);

MXNET_DLL int MXGetGPUMemoryInformation64(int dev, uint64_t *free_mem, uint64_t *total_mem);

MXNET_DLL int MXGetVersion(int *out);

#if MXNET_USE_TVM_OP
MXNET_DLL int MXLoadTVMOp(const char *libpath);

struct OtherOptionEntity {
  int val;
};

struct OtherOptionSpace {
  OtherOptionEntity* entities;
  int entities_size;
};

struct ConfigSpace {
  int entity_map_size;
  char** entity_map_key;
  OtherOptionEntity* entity_map_val;
  int space_map_size;
  char** space_map_key;
  OtherOptionSpace* space_map_val;
};

typedef struct ConfigSpaces {
  int spaces_size;
  char** spaces_key;
  ConfigSpace* spaces_val;
} ConfigSpaces;

MXNET_DLL int MXLoadTVMConfig(ConfigSpaces config);
#endif  // MXNET_USE_TVM_OP


//-------------------------------------
// Part 1: NDArray creation and deletion
//-------------------------------------
MXNET_DLL int MXNDArrayCreateNone(NDArrayHandle *out);
MXNET_DLL int MXNDArrayCreate(const uint32_t *shape,
                              uint32_t ndim,
                              int dev_type,
                              int dev_id,
                              int delay_alloc,
                              NDArrayHandle *out);

MXNET_DLL int MXNDArrayCreateEx(const uint32_t *shape,
                                uint32_t ndim,
                                int dev_type,
                                int dev_id,
                                int delay_alloc,
                                int dtype,
                                NDArrayHandle *out);

MXNET_DLL int MXNDArrayCreateEx64(const int64_t *shape,
                                  int ndim,
                                  int dev_type,
                                  int dev_id,
                                  int delay_alloc,
                                  int dtype,
                                  NDArrayHandle *out);

MXNET_DLL int MXNDArrayCreateSparseEx(int storage_type,
                                      const uint32_t *shape,
                                      uint32_t ndim,
                                      int dev_type,
                                      int dev_id,
                                      int delay_alloc,
                                      int dtype,
                                      uint32_t num_aux,
                                      int *aux_type,
                                      uint32_t *aux_ndims,
                                      const uint32_t *aux_shape,
                                      NDArrayHandle *out);

MXNET_DLL int MXNDArrayCreateSparseEx64(int storage_type,
                                        const int64_t *shape,
                                        int ndim,
                                        int dev_type,
                                        int dev_id,
                                        int delay_alloc,
                                        int dtype,
                                        uint32_t num_aux,
                                        int *aux_type,
                                        int *aux_ndims,
                                        const int64_t *aux_shape,
                                        NDArrayHandle *out);

MXNET_DLL int MXNDArrayLoadFromRawBytes(const void *buf,
                                        size_t size,
                                        NDArrayHandle *out);
MXNET_DLL int MXNDArraySaveRawBytes(NDArrayHandle handle,
                                    size_t *out_size,
                                    const char **out_buf);
MXNET_DLL int MXNDArraySave(const char* fname,
                            uint32_t num_args,
                            NDArrayHandle* args,
                            const char** keys);
MXNET_DLL int MXNDArrayLoad(const char* fname,
                            uint32_t *out_size,
                            NDArrayHandle** out_arr,
                            uint32_t *out_name_size,
                            const char*** out_names);

MXNET_DLL int MXNDArrayLoadFromBuffer(const void *ndarray_buffer,
                                      size_t size,
                                      uint32_t *out_size,
                                      NDArrayHandle** out_arr,
                                      uint32_t *out_name_size,
                                      const char*** out_names);

MXNET_DLL int MXNDArraySyncCopyFromCPU(NDArrayHandle handle,
                                       const void *data,
                                       size_t size);
MXNET_DLL int MXNDArraySyncCopyToCPU(NDArrayHandle handle,
                                     void *data,
                                     size_t size);

MXNET_DLL int MXNDArraySyncCopyFromNDArray(NDArrayHandle handle_dst,
                                           const NDArrayHandle handle_src,
                                           const int i);

MXNET_DLL int MXNDArraySyncCheckFormat(NDArrayHandle handle, const bool full_check);

MXNET_DLL int MXNDArrayWaitToRead(NDArrayHandle handle);

MXNET_DLL int MXNDArrayWaitToWrite(NDArrayHandle handle);

MXNET_DLL int MXNDArrayWaitAll();

MXNET_DLL int MXNDArrayFree(NDArrayHandle handle);

MXNET_DLL int MXNDArraySlice(NDArrayHandle handle,
                             uint32_t slice_begin,
                             uint32_t slice_end,
                             NDArrayHandle *out);

MXNET_DLL int MXNDArraySlice64(NDArrayHandle handle,
                               int64_t slice_begin,
                               int64_t slice_end,
                               NDArrayHandle *out);

MXNET_DLL int MXNDArrayAt(NDArrayHandle handle,
                          uint32_t idx,
                          NDArrayHandle *out);

MXNET_DLL int MXNDArrayAt64(NDArrayHandle handle,
                            int64_t idx,
                            NDArrayHandle *out);

MXNET_DLL int MXNDArrayGetStorageType(NDArrayHandle handle,
                                      int *out_storage_type);

MXNET_DLL int MXNDArrayReshape(NDArrayHandle handle,
                               int ndim,
                               int *dims,
                               NDArrayHandle *out);

MXNET_DLL int MXNDArrayReshape64(NDArrayHandle handle,
                                 int ndim,
                                 dim_t *dims,
                                 bool reverse,
                                 NDArrayHandle *out);
MXNET_DLL int MXNDArrayGetShape(NDArrayHandle handle,
                                uint32_t *out_dim,
                                const uint32_t **out_pdata);

MXNET_DLL int MXNDArrayGetShapeEx(NDArrayHandle handle,
                                  int *out_dim,
                                  const int **out_pdata);

MXNET_DLL int MXNDArrayGetShapeEx64(NDArrayHandle handle,
                                    int *out_dim,
                                    const int64_t **out_pdata);

MXNET_DLL int MXNDArrayGetData(NDArrayHandle handle,
                               void **out_pdata);
MXNET_DLL int MXNDArrayToDLPack(NDArrayHandle handle,
                                       DLManagedTensorHandle *out_dlpack);

MXNET_DLL int MXNDArrayFromDLPack(DLManagedTensorHandle dlpack,
                                  NDArrayHandle *out_handle);

MXNET_DLL int MXNDArrayFromDLPackEx(DLManagedTensorHandle dlpack,
                                    const bool transient_handle,
                                    NDArrayHandle *out_handle);

MXNET_DLL int MXNDArrayCallDLPackDeleter(DLManagedTensorHandle dlpack);

MXNET_DLL int MXNDArrayGetDType(NDArrayHandle handle,
                               int *out_dtype);

MXNET_DLL int MXNDArrayGetAuxType(NDArrayHandle handle,
                                  uint32_t i,
                                  int *out_type);

MXNET_DLL int MXNDArrayGetAuxType64(NDArrayHandle handle,
                                    int64_t i,
                                    int *out_type);

MXNET_DLL int MXNDArrayGetAuxNDArray(NDArrayHandle handle,
                                     uint32_t i,
                                     NDArrayHandle *out);

MXNET_DLL int MXNDArrayGetAuxNDArray64(NDArrayHandle handle,
                                       int64_t i,
                                       NDArrayHandle *out);

MXNET_DLL int MXNDArrayGetDataNDArray(NDArrayHandle handle,
                                      NDArrayHandle *out);
MXNET_DLL int MXNDArrayGetContext(NDArrayHandle handle,
                                  int *out_dev_type,
                                  int *out_dev_id);
MXNET_DLL int MXNDArrayGetGrad(NDArrayHandle handle, NDArrayHandle *out);
MXNET_DLL int MXNDArrayDetach(NDArrayHandle handle, NDArrayHandle *out);
MXNET_DLL int MXNDArraySetGradState(NDArrayHandle handle, int state);
MXNET_DLL int MXNDArrayGetGradState(NDArrayHandle handle, int *out);
//--------------------------------
// Part 2: functions on NDArray
//--------------------------------
MXNET_DLL int MXListFunctions(uint32_t *out_size,
                              FunctionHandle **out_array);

MXNET_DLL int MXGetFunction(const char *name,
                            FunctionHandle *out);
MXNET_DLL int MXFuncGetInfo(FunctionHandle fun,
                            const char **name,
                            const char **description,
                            uint32_t *num_args,
                            const char ***arg_names,
                            const char ***arg_type_infos,
                            const char ***arg_descriptions,
                            const char **return_type DEFAULT(NULL));
MXNET_DLL int MXFuncDescribe(FunctionHandle fun,
                             uint32_t *num_use_vars,
                             uint32_t *num_scalars,
                             uint32_t *num_mutate_vars,
                             int *type_mask);
MXNET_DLL int MXFuncInvoke(FunctionHandle fun,
                           NDArrayHandle *use_vars,
                           float *scalar_args,
                           NDArrayHandle *mutate_vars);
MXNET_DLL int MXFuncInvokeEx(FunctionHandle fun,
                             NDArrayHandle *use_vars,
                             float *scalar_args,
                             NDArrayHandle *mutate_vars,
                             int num_params,
                             char **param_keys,
                             char **param_vals);
MXNET_DLL int MXImperativeInvoke(AtomicSymbolCreator creator,
                                 int num_inputs,
                                 NDArrayHandle *inputs,
                                 int *num_outputs,
                                 NDArrayHandle **outputs,
                                 int num_params,
                                 const char **param_keys,
                                 const char **param_vals);
MXNET_DLL int MXImperativeInvokeEx(AtomicSymbolCreator creator,
                                   int num_inputs,
                                   NDArrayHandle *inputs,
                                   int *num_outputs,
                                   NDArrayHandle **outputs,
                                   int num_params,
                                   const char **param_keys,
                                   const char **param_vals,
                                   const int **out_stypes);
MXNET_DLL int MXAutogradSetIsRecording(int is_recording, int* prev);
MXNET_DLL int MXAutogradSetIsTraining(int is_training, int* prev);
MXNET_DLL int MXAutogradIsRecording(bool* curr);
MXNET_DLL int MXAutogradIsTraining(bool* curr);
MXNET_DLL int MXIsNumpyShape(int* curr);
MXNET_DLL int MXSetIsNumpyShape(int is_np_shape, int* prev);
MXNET_DLL int MXAutogradMarkVariables(uint32_t num_var,
                                      NDArrayHandle *var_handles,
                                      uint32_t *reqs_array,
                                      NDArrayHandle *grad_handles);
MXNET_DLL int MXAutogradComputeGradient(uint32_t num_output,
                                        NDArrayHandle* output_handles);
MXNET_DLL int MXAutogradBackward(uint32_t num_output,
                                 NDArrayHandle* output_handles,
                                 NDArrayHandle* ograd_handles,
                                 int retain_graph);
MXNET_DLL int MXAutogradBackwardEx(uint32_t num_output,
                                   NDArrayHandle *output_handles,
                                   NDArrayHandle *ograd_handles,
                                   uint32_t num_variables,
                                   NDArrayHandle *var_handles,
                                   int retain_graph,
                                   int create_graph,
                                   int is_train,
                                   NDArrayHandle **grad_handles,
                                   int **grad_stypes);
/*
 * \brief get the graph constructed by autograd.
 * \param handle ndarray handle
 * \param out output symbol handle
 */
MXNET_DLL int MXAutogradGetSymbol(NDArrayHandle handle, SymbolHandle *out);
MXNET_DLL int MXCreateCachedOp(SymbolHandle handle, CachedOpHandle *out);
MXNET_DLL int MXCreateCachedOpEx(SymbolHandle handle,
                                 int num_flags,
                                 const char** keys,
                                 const char** vals,
                                 CachedOpHandle *out);

MXNET_DLL int MXCreateCachedOpEX(SymbolHandle handle,
                                 int num_flags,
                                 const char** keys,
                                 const char** vals,
                                 CachedOpHandle *out,
                                 bool thread_safe DEFAULT(false));

MXNET_DLL int MXFreeCachedOp(CachedOpHandle handle);

MXNET_DLL int MXInvokeCachedOp(CachedOpHandle handle,
                               int num_inputs,
                               NDArrayHandle *inputs,
                               int *num_outputs,
                               NDArrayHandle **outputs);

MXNET_DLL int MXInvokeCachedOpEx(CachedOpHandle handle,
                                 int num_inputs,
                                 NDArrayHandle *inputs,
                                 int *num_outputs,
                                 NDArrayHandle **outputs,
                                 const int** out_stypes);

MXNET_DLL int MXCachedOpRegisterOpHook(NDArrayHandle handle,
                                       CachedOpMonitorCallback callback,
                                       bool monitor_all);

//--------------------------------------------
// Part 3: symbolic configuration generation
//--------------------------------------------
MXNET_DLL int MXListAllOpNames(uint32_t *out_size,
                               const char ***out_array);

MXNET_DLL int MXSymbolListAtomicSymbolCreators(uint32_t *out_size,
                                               AtomicSymbolCreator **out_array);

MXNET_DLL int MXSymbolGetAtomicSymbolName(AtomicSymbolCreator creator,
                                          const char **name);

MXNET_DLL int MXSymbolGetInputSymbols(SymbolHandle sym, SymbolHandle **inputs,
                                      int *input_size);

MXNET_DLL int MXSymbolCutSubgraph(SymbolHandle sym, SymbolHandle **inputs,
                                  int *input_size);

MXNET_DLL int MXSymbolGetAtomicSymbolInfo(AtomicSymbolCreator creator,
                                          const char **name,
                                          const char **description,
                                          uint32_t *num_args,
                                          const char ***arg_names,
                                          const char ***arg_type_infos,
                                          const char ***arg_descriptions,
                                          const char **key_var_num_args,
                                          const char **return_type DEFAULT(NULL));
MXNET_DLL int MXSymbolCreateAtomicSymbol(AtomicSymbolCreator creator,
                                         uint32_t num_param,
                                         const char **keys,
                                         const char **vals,
                                         SymbolHandle *out);
MXNET_DLL int MXSymbolCreateVariable(const char *name, SymbolHandle *out);
MXNET_DLL int MXSymbolCreateGroup(uint32_t num_symbols,
                                  SymbolHandle *symbols,
                                  SymbolHandle *out);
MXNET_DLL int MXSymbolCreateFromFile(const char *fname, SymbolHandle *out);
MXNET_DLL int MXSymbolCreateFromJSON(const char *json, SymbolHandle *out);
MXNET_DLL int MXSymbolRemoveAmpCast(SymbolHandle sym_handle, SymbolHandle* ret_sym_handle);
MXNET_DLL int MXSymbolSaveToFile(SymbolHandle symbol, const char *fname);
MXNET_DLL int MXSymbolSaveToJSON(SymbolHandle symbol, const char **out_json);
MXNET_DLL int MXSymbolFree(SymbolHandle symbol);
MXNET_DLL int MXSymbolCopy(SymbolHandle symbol, SymbolHandle *out);
MXNET_DLL int MXSymbolPrint(SymbolHandle symbol, const char **out_str);
MXNET_DLL int MXSymbolGetName(SymbolHandle symbol,
                              const char** out,
                              int *success);
MXNET_DLL int MXSymbolGetAttr(SymbolHandle symbol,
                              const char* key,
                              const char** out,
                              int *success);
MXNET_DLL int MXSymbolSetAttr(SymbolHandle symbol,
                              const char* key,
                              const char* value);
MXNET_DLL int MXSymbolListAttr(SymbolHandle symbol,
                               uint32_t *out_size,
                               const char*** out);
MXNET_DLL int MXSymbolListAttrShallow(SymbolHandle symbol,
                                      uint32_t *out_size,
                                      const char*** out);
MXNET_DLL int MXSymbolListArguments(SymbolHandle symbol,
                                    uint32_t *out_size,
                                    const char ***out_str_array);

MXNET_DLL int MXSymbolListOutputs(SymbolHandle symbol,
                                  uint32_t *out_size,
                                  const char ***out_str_array);

MXNET_DLL int MXSymbolGetNumOutputs(SymbolHandle symbol,
                                    uint32_t *output_count);

MXNET_DLL int MXSymbolGetInternals(SymbolHandle symbol,
                                   SymbolHandle *out);
MXNET_DLL int MXSymbolGetChildren(SymbolHandle symbol,
                                  SymbolHandle *out);
MXNET_DLL int MXSymbolGetOutput(SymbolHandle symbol,
                                uint32_t index,
                                SymbolHandle *out);

MXNET_DLL int MXSymbolListAuxiliaryStates(SymbolHandle symbol,
                                          uint32_t *out_size,
                                          const char ***out_str_array);

MXNET_DLL int MXSymbolCompose(SymbolHandle sym,
                              const char *name,
                              uint32_t num_args,
                              const char** keys,
                              SymbolHandle* args);
MXNET_DLL int MXSymbolGrad(SymbolHandle sym,
                           uint32_t num_wrt,
                           const char** wrt,
                           SymbolHandle* out);
MXNET_DLL int MXSymbolInferShape(SymbolHandle sym,
                                 uint32_t num_args,
                                 const char** keys,
                                 const uint32_t *arg_ind_ptr,
                                 const uint32_t *arg_shape_data,
                                 uint32_t *in_shape_size,
                                 const uint32_t **in_shape_ndim,
                                 const uint32_t ***in_shape_data,
                                 uint32_t *out_shape_size,
                                 const uint32_t **out_shape_ndim,
                                 const uint32_t ***out_shape_data,
                                 uint32_t *aux_shape_size,
                                 const uint32_t **aux_shape_ndim,
                                 const uint32_t ***aux_shape_data,
                                 int *complete);

MXNET_DLL int MXSymbolInferShapeEx(SymbolHandle sym,
                                   uint32_t num_args,
                                   const char** keys,
                                   const uint32_t *arg_ind_ptr,
                                   const int *arg_shape_data,
                                   uint32_t *in_shape_size,
                                   const int **in_shape_ndim,
                                   const int ***in_shape_data,
                                   uint32_t *out_shape_size,
                                   const int **out_shape_ndim,
                                   const int ***out_shape_data,
                                   uint32_t *aux_shape_size,
                                   const int **aux_shape_ndim,
                                   const int ***aux_shape_data,
                                   int *complete);

MXNET_DLL int MXSymbolInferShapeEx64(SymbolHandle sym,
                                     uint32_t num_args,
                                     const char** keys,
                                     const int64_t *arg_ind_ptr,
                                     const int64_t *arg_shape_data,
                                     size_t *in_shape_size,
                                     const int **in_shape_ndim,
                                     const int64_t ***in_shape_data,
                                     size_t *out_shape_size,
                                     const int **out_shape_ndim,
                                     const int64_t ***out_shape_data,
                                     size_t *aux_shape_size,
                                     const int **aux_shape_ndim,
                                     const int64_t ***aux_shape_data,
                                     int *complete);

MXNET_DLL int MXSymbolInferShapePartial(SymbolHandle sym,
                                        uint32_t num_args,
                                        const char** keys,
                                        const uint32_t *arg_ind_ptr,
                                        const uint32_t *arg_shape_data,
                                        uint32_t *in_shape_size,
                                        const uint32_t **in_shape_ndim,
                                        const uint32_t ***in_shape_data,
                                        uint32_t *out_shape_size,
                                        const uint32_t **out_shape_ndim,
                                        const uint32_t ***out_shape_data,
                                        uint32_t *aux_shape_size,
                                        const uint32_t **aux_shape_ndim,
                                        const uint32_t ***aux_shape_data,
                                        int *complete);

MXNET_DLL int MXSymbolInferShapePartialEx(SymbolHandle sym,
                                          uint32_t num_args,
                                          const char** keys,
                                          const uint32_t *arg_ind_ptr,
                                          const int *arg_shape_data,
                                          uint32_t *in_shape_size,
                                          const int **in_shape_ndim,
                                          const int ***in_shape_data,
                                          uint32_t *out_shape_size,
                                          const int **out_shape_ndim,
                                          const int ***out_shape_data,
                                          uint32_t *aux_shape_size,
                                          const int **aux_shape_ndim,
                                          const int ***aux_shape_data,
                                          int *complete);

MXNET_DLL int MXSymbolInferShapePartialEx64(SymbolHandle sym,
                                            uint32_t num_args,
                                            const char** keys,
                                            const int64_t *arg_ind_ptr,
                                            const int64_t *arg_shape_data,
                                            size_t *in_shape_size,
                                            const int **in_shape_ndim,
                                            const int64_t ***in_shape_data,
                                            size_t *out_shape_size,
                                            const int **out_shape_ndim,
                                            const int64_t ***out_shape_data,
                                            size_t *aux_shape_size,
                                            const int **aux_shape_ndim,
                                            const int64_t ***aux_shape_data,
                                            int *complete);

MXNET_DLL int MXSymbolInferType(SymbolHandle sym,
                                uint32_t num_args,
                                const char** keys,
                                const int *arg_type_data,
                                uint32_t *in_type_size,
                                const int **in_type_data,
                                uint32_t *out_type_size,
                                const int **out_type_data,
                                uint32_t *aux_type_size,
                                const int **aux_type_data,
                                int *complete);

MXNET_DLL int MXSymbolInferTypePartial(SymbolHandle sym,
                                       uint32_t num_args,
                                       const char** keys,
                                       const int *arg_type_data,
                                       uint32_t *in_type_size,
                                       const int **in_type_data,
                                       uint32_t *out_type_size,
                                       const int **out_type_data,
                                       uint32_t *aux_type_size,
                                       const int **aux_type_data,
                                       int *complete);

MXNET_DLL int MXQuantizeSymbol(SymbolHandle sym_handle,
                               SymbolHandle *ret_sym_handle,
                               const int* dev_type,
                               const uint32_t num_excluded_sym_names,
                               const char **excluded_sym_names,
                               const uint32_t num_excluded_op_names,
                               const char **excluded_op_names,
                               const uint32_t num_offline, const char **offline_params,
                               const char *quantized_dtype, const bool calib_quantize,
                               const char *quantize_mode, const char *quantize_granularity,
                               uint32_t* out_num_calib_names, const char ***out_calib_names);

MXNET_DLL int MXReducePrecisionSymbol(SymbolHandle sym_handle,
                                      SymbolHandle *ret_sym_handle,
                                      uint32_t num_args,
                                      const int* arg_type_data,
                                      uint32_t num_ind_ptr,
                                      const int* ind_ptr,
                                      const int* target_dtype,
                                      const int cast_optional_params,
                                      const uint32_t num_target_dtype_op_names,
                                      const uint32_t num_fp32_op_names,
                                      const uint32_t num_widest_dtype_op_names,
                                      const uint32_t num_conditional_fp32_op_names,
                                      const uint32_t num_excluded_symbols,
                                      const uint32_t num_model_params,
                                      const char **target_dtype_op_names,
                                      const char **fp32_op_names,
                                      const char **widest_dtype_op_names,
                                      const char **conditional_fp32_op_names,
                                      const char **excluded_symbols,
                                      const char **conditional_param_names,
                                      const char **conditional_param_vals,
                                      const char **model_param_names,
                                      const char **arg_names);
MXNET_DLL int MXSetCalibTableToQuantizedSymbol(SymbolHandle qsym_handle,
                                               const uint32_t num_layers,
                                               const char** layer_names,
                                               const float* low_quantiles,
                                               const float* high_quantiles,
                                               SymbolHandle* ret_sym_handle);

MXNET_DLL int MXGenBackendSubgraph(SymbolHandle sym_handle, const char *backend,
                                   SymbolHandle *ret_sym_handle);

MXNET_DLL int MXGenAtomicSymbolFromSymbol(SymbolHandle sym_handle, SymbolHandle *ret_sym_handle);
MXNET_DLL int MXOptimizeForBackend(SymbolHandle sym_handle,
                                   const char* backend_name,
                                   const int dev_type,
                                   SymbolHandle* ret_sym_handle,
                                   const mx_uint args_len,
                                   NDArrayHandle* in_args_handle,
                                   const mx_uint aux_len,
                                   NDArrayHandle* in_aux_handle,
                                   const mx_uint num_options,
                                   const char** keys,
                                   const char** vals,
                                   const uint32_t num_input_shapes,
                                   const char** input_shape_names,
                                   const int64_t* input_shape_data,
                                   const uint32_t* input_shape_idx,
                                   const uint32_t num_input_dtypes,
                                   const char** input_dtype_names,
                                   const int* input_dtypes,
                                   const uint32_t num_input_stypes,
                                   const char** input_stype_names,
                                   const int* input_stypes,
                                   bool skip_infer,
                                   int* new_args_cnt,
                                   NDArrayHandle** new_args_handle,
                                   char*** new_arg_names_handle,
                                   int* new_aux_cnt,
                                   NDArrayHandle** new_aux_handle,
                                   char*** new_aux_names_handle);


//--------------------------------------------
// Part 4: Executor interface
//--------------------------------------------
MXNET_DLL int MXExecutorFree(ExecutorHandle handle);
MXNET_DLL int MXExecutorPrint(ExecutorHandle handle, const char **out_str);
MXNET_DLL int MXExecutorForward(ExecutorHandle handle, int is_train);
MXNET_DLL int MXExecutorBackward(ExecutorHandle handle,
                                 uint32_t len,
                                 NDArrayHandle *head_grads);
MXNET_DLL int MXExecutorBackwardEx(ExecutorHandle handle,
                                   uint32_t len,
                                   NDArrayHandle *head_grads,
                                   int is_train);
MXNET_DLL int MXExecutorOutputs(ExecutorHandle handle,
                                uint32_t *out_size,
                                NDArrayHandle **out);

MXNET_DLL int MXExecutorBind(SymbolHandle symbol_handle,
                             int dev_type,
                             int dev_id,
                             uint32_t len,
                             NDArrayHandle *in_args,
                             NDArrayHandle *arg_grad_store,
                             uint32_t *grad_req_type,
                             uint32_t aux_states_len,
                             NDArrayHandle *aux_states,
                             ExecutorHandle *out);
MXNET_DLL int MXExecutorBindX(SymbolHandle symbol_handle,
                              int dev_type,
                              int dev_id,
                              uint32_t num_map_keys,
                              const char** map_keys,
                              const int* map_dev_types,
                              const int* map_dev_ids,
                              uint32_t len,
                              NDArrayHandle *in_args,
                              NDArrayHandle *arg_grad_store,
                              uint32_t *grad_req_type,
                              uint32_t aux_states_len,
                              NDArrayHandle *aux_states,
                              ExecutorHandle *out);
MXNET_DLL int MXExecutorBindEX(SymbolHandle symbol_handle,
                               int dev_type,
                               int dev_id,
                               uint32_t num_map_keys,
                               const char** map_keys,
                               const int* map_dev_types,
                               const int* map_dev_ids,
                               uint32_t len,
                               NDArrayHandle *in_args,
                               NDArrayHandle *arg_grad_store,
                               uint32_t *grad_req_type,
                               uint32_t aux_states_len,
                               NDArrayHandle *aux_states,
                               ExecutorHandle shared_exec,
                               ExecutorHandle *out);
MXNET_DLL int MXExecutorSimpleBind(SymbolHandle symbol_handle,
                                   int dev_type,
                                   int dev_id,
                                   const uint32_t num_g2c_keys,
                                   const char** g2c_keys,
                                   const int* g2c_dev_types,
                                   const int* g2c_dev_ids,
                                   const uint32_t provided_grad_req_list_len,
                                   const char** provided_grad_req_names,
                                   const char** provided_grad_req_types,
                                   const uint32_t num_provided_arg_shapes,
                                   const char** provided_arg_shape_names,
                                   const uint32_t* provided_arg_shape_data,
                                   const uint32_t* provided_arg_shape_idx,
                                   const uint32_t num_provided_arg_dtypes,
                                   const char** provided_arg_dtype_names,
                                   const int* provided_arg_dtypes,
                                   const uint32_t num_provided_arg_stypes,
                                   const char** provided_arg_stype_names,
                                   const int* provided_arg_stypes,
                                   const uint32_t num_shared_arg_names,
                                   const char** shared_arg_name_list,
                                   int* shared_buffer_len,
                                   const char** shared_buffer_name_list,
                                   NDArrayHandle* shared_buffer_handle_list,
                                   const char*** updated_shared_buffer_name_list,
                                   NDArrayHandle** updated_shared_buffer_handle_list,
                                   uint32_t* num_in_args,
                                   NDArrayHandle** in_args,
                                   NDArrayHandle** arg_grads,
                                   uint32_t* num_aux_states,
                                   NDArrayHandle** aux_states,
                                   ExecutorHandle shared_exec_handle,
                                   ExecutorHandle* out);


MXNET_DLL int MXExecutorSimpleBindEx(SymbolHandle symbol_handle,
                                     int dev_type,
                                     int dev_id,
                                     const uint32_t num_g2c_keys,
                                     const char** g2c_keys,
                                     const int* g2c_dev_types,
                                     const int* g2c_dev_ids,
                                     const uint32_t provided_grad_req_list_len,
                                     const char** provided_grad_req_names,
                                     const char** provided_grad_req_types,
                                     const uint32_t num_provided_arg_shapes,
                                     const char** provided_arg_shape_names,
                                     const int* provided_arg_shape_data,
                                     const uint32_t* provided_arg_shape_idx,
                                     const uint32_t num_provided_arg_dtypes,
                                     const char** provided_arg_dtype_names,
                                     const int* provided_arg_dtypes,
                                     const uint32_t num_provided_arg_stypes,
                                     const char** provided_arg_stype_names,
                                     const int* provided_arg_stypes,
                                     const uint32_t num_shared_arg_names,
                                     const char** shared_arg_name_list,
                                     int* shared_buffer_len,
                                     const char** shared_buffer_name_list,
                                     NDArrayHandle* shared_buffer_handle_list,
                                     const char*** updated_shared_buffer_name_list,
                                     NDArrayHandle** updated_shared_buffer_handle_list,
                                     uint32_t* num_in_args,
                                     NDArrayHandle** in_args,
                                     NDArrayHandle** arg_grads,
                                     uint32_t* num_aux_states,
                                     NDArrayHandle** aux_states,
                                     ExecutorHandle shared_exec_handle,
                                     ExecutorHandle* out);


MXNET_DLL int MXExecutorSimpleBindEx64(SymbolHandle symbol_handle,
                                     int dev_type,
                                     int dev_id,
                                     const uint32_t num_g2c_keys,
                                     const char** g2c_keys,
                                     const int* g2c_dev_types,
                                     const int* g2c_dev_ids,
                                     const uint32_t provided_grad_req_list_len,
                                     const char** provided_grad_req_names,
                                     const char** provided_grad_req_types,
                                     const uint32_t num_provided_arg_shapes,
                                     const char** provided_arg_shape_names,
                                     const int64_t* provided_arg_shape_data,
                                     const uint32_t* provided_arg_shape_idx,
                                     const uint32_t num_provided_arg_dtypes,
                                     const char** provided_arg_dtype_names,
                                     const int* provided_arg_dtypes,
                                     const uint32_t num_provided_arg_stypes,
                                     const char** provided_arg_stype_names,
                                     const int* provided_arg_stypes,
                                     const uint32_t num_shared_arg_names,
                                     const char** shared_arg_name_list,
                                     int* shared_buffer_len,
                                     const char** shared_buffer_name_list,
                                     NDArrayHandle* shared_buffer_handle_list,
                                     const char*** updated_shared_buffer_name_list,
                                     NDArrayHandle** updated_shared_buffer_handle_list,
                                     uint32_t* num_in_args,
                                     NDArrayHandle** in_args,
                                     NDArrayHandle** arg_grads,
                                     uint32_t* num_aux_states,
                                     NDArrayHandle** aux_states,
                                     ExecutorHandle shared_exec_handle,
                                     ExecutorHandle* out);


MXNET_DLL int MXExecutorReshape(int partial_shaping,
                                int allow_up_sizing,
                                int dev_type,
                                int dev_id,
                                uint32_t num_map_keys,
                                const char** map_keys,
                                const int* map_dev_types,
                                const int* map_dev_ids,
                                const uint32_t num_provided_arg_shapes,
                                const char** provided_arg_shape_names,
                                const uint32_t* provided_arg_shape_data,
                                const uint32_t* provided_arg_shape_idx,
                                uint32_t* num_in_args,
                                NDArrayHandle** in_args,
                                NDArrayHandle** arg_grads,
                                uint32_t* num_aux_states,
                                NDArrayHandle** aux_states,
                                ExecutorHandle shared_exec,
                                ExecutorHandle *out);
MXNET_DLL int MXExecutorReshapeEx(int partial_shaping,
                                  int allow_up_sizing,
                                  int dev_type,
                                  int dev_id,
                                  uint32_t num_map_keys,
                                  const char** map_keys,
                                  const int* map_dev_types,
                                  const int* map_dev_ids,
                                  const uint32_t num_provided_arg_shapes,
                                  const char** provided_arg_shape_names,
                                  const int* provided_arg_shape_data,
                                  const uint32_t* provided_arg_shape_idx,
                                  uint32_t* num_in_args,
                                  NDArrayHandle** in_args,
                                  NDArrayHandle** arg_grads,
                                  uint32_t* num_aux_states,
                                  NDArrayHandle** aux_states,
                                  ExecutorHandle shared_exec,
                                  ExecutorHandle *out);

MXNET_DLL int MXExecutorGetOptimizedSymbol(ExecutorHandle handle,
                                           SymbolHandle *out);
MXNET_DLL int MXExecutorSetMonitorCallback(ExecutorHandle handle,
                                           ExecutorMonitorCallback callback,
                                           void* callback_handle);

MXNET_DLL int MXExecutorSetMonitorCallbackEX(ExecutorHandle handle,
                                             ExecutorMonitorCallback callback,
                                             void *callback_handle, bool monitor_all);
//--------------------------------------------
// Part 5: IO Interface
//--------------------------------------------
MXNET_DLL int MXListDataIters(uint32_t *out_size,
                              DataIterCreator **out_array);
MXNET_DLL int MXDataIterCreateIter(DataIterCreator handle,
                                   uint32_t num_param,
                                   const char **keys,
                                   const char **vals,
                                   DataIterHandle *out);
MXNET_DLL int MXDataIterGetIterInfo(DataIterCreator creator,
                                    const char **name,
                                    const char **description,
                                    uint32_t *num_args,
                                    const char ***arg_names,
                                    const char ***arg_type_infos,
                                    const char ***arg_descriptions);
MXNET_DLL int MXDataIterFree(DataIterHandle handle);
MXNET_DLL int MXDataIterNext(DataIterHandle handle,
                             int *out);
MXNET_DLL int MXDataIterBeforeFirst(DataIterHandle handle);

MXNET_DLL int MXDataIterGetData(DataIterHandle handle,
                                NDArrayHandle *out);
MXNET_DLL int MXDataIterGetIndex(DataIterHandle handle,
                                 uint64_t **out_index,
                                 uint64_t *out_size);
MXNET_DLL int MXDataIterGetPadNum(DataIterHandle handle,
                                  int *pad);

MXNET_DLL int MXDataIterGetLabel(DataIterHandle handle,
                                 NDArrayHandle *out);
//--------------------------------------------
// Part 6: basic KVStore interface
//--------------------------------------------
MXNET_DLL int MXInitPSEnv(uint32_t num_vars,
                          const char **keys,
                          const char **vals);


MXNET_DLL int MXKVStoreCreate(const char *type,
                              KVStoreHandle *out);

MXNET_DLL int MXKVStoreSetGradientCompression(KVStoreHandle handle,
                                              uint32_t num_params,
                                              const char** keys,
                                              const char** vals);

MXNET_DLL int MXKVStoreFree(KVStoreHandle handle);
MXNET_DLL int MXKVStoreInit(KVStoreHandle handle,
                            uint32_t num,
                            const int* keys,
                            NDArrayHandle* vals);

MXNET_DLL int MXKVStoreInitEx(KVStoreHandle handle,
                              uint32_t num,
                              const char** keys,
                              NDArrayHandle* vals);

MXNET_DLL int MXKVStorePush(KVStoreHandle handle,
                            uint32_t num,
                            const int* keys,
                            NDArrayHandle* vals,
                            int priority);
MXNET_DLL int MXKVStorePushEx(KVStoreHandle handle,
                              uint32_t num,
                              const char** keys,
                              NDArrayHandle* vals,
                              int priority);
MXNET_DLL int MXKVStorePullWithSparse(KVStoreHandle handle,
                                      uint32_t num,
                                      const int* keys,
                                      NDArrayHandle* vals,
                                      int priority,
                                      bool ignore_sparse);
MXNET_DLL int MXKVStorePullWithSparseEx(KVStoreHandle handle,
                                        uint32_t num,
                                        const char** keys,
                                        NDArrayHandle* vals,
                                        int priority,
                                        bool ignore_sparse);
MXNET_DLL int MXKVStorePull(KVStoreHandle handle,
                            uint32_t num,
                            const int* keys,
                            NDArrayHandle* vals,
                            int priority);
MXNET_DLL int MXKVStorePullEx(KVStoreHandle handle,
                              uint32_t num,
                              const char** keys,
                              NDArrayHandle* vals,
                              int priority);

MXNET_DLL int MXKVStorePullRowSparse(KVStoreHandle handle,
                                     uint32_t num,
                                     const int* keys,
                                     NDArrayHandle* vals,
                                     const NDArrayHandle* row_ids,
                                     int priority);
MXNET_DLL int MXKVStorePullRowSparseEx(KVStoreHandle handle,
                                       uint32_t num,
                                       const char** keys,
                                       NDArrayHandle* vals,
                                       const NDArrayHandle* row_ids,
                                       int priority);

MXNET_DLL int MXKVStoreBroadcast(KVStoreHandle handle,
                                 mx_uint vnum,
                                 const int* vkeys,
                                 mx_uint onum,
                                 const int* okeys,
                                 NDArrayHandle* vals,
                                 NDArrayHandle* outs,
                                 int priority);
MXNET_DLL int MXKVStoreBroadcastEx(KVStoreHandle handle,
                                   mx_uint vnum,
                                   const char** vkeys,
                                   mx_uint onum,
                                   const char** okeys,
                                   NDArrayHandle* vals,
                                   NDArrayHandle* outs,
                                   int priority);

MXNET_DLL int MXKVStorePushPull(KVStoreHandle handle,
                                mx_uint vnum,
                                const int* vkeys,
                                mx_uint onum,
                                const int* okeys,
                                NDArrayHandle* vals,
                                NDArrayHandle* outs,
                                int priority);
MXNET_DLL int MXKVStorePushPullEx(KVStoreHandle handle,
                                  mx_uint vnum,
                                  const char** vkeys,
                                  mx_uint onum,
                                  const char** okeys,
                                  NDArrayHandle* vals,
                                  NDArrayHandle* outs,
                                  int priority);

typedef void (MXKVStoreUpdater)(int key,
                                NDArrayHandle recv,
                                NDArrayHandle local,
                                void *handle);
typedef void (MXKVStoreStrUpdater)(const char* key,
                                   NDArrayHandle recv,
                                   NDArrayHandle local,
                                   void *handle);
MXNET_DLL int MXKVStoreSetUpdater(KVStoreHandle handle,
                                  MXKVStoreUpdater updater,
                                  void *updater_handle);
MXNET_DLL int MXKVStoreSetUpdaterEx(KVStoreHandle handle,
                                    MXKVStoreUpdater updater,
                                    MXKVStoreStrUpdater str_updater,
                                    void *updater_handle);
MXNET_DLL int MXKVStoreGetType(KVStoreHandle handle,
                               const char** type);
//--------------------------------------------
// Part 6: advanced KVStore for multi-machines
//--------------------------------------------

MXNET_DLL int MXKVStoreGetRank(KVStoreHandle handle,
                               int *ret);

MXNET_DLL int MXKVStoreGetGroupSize(KVStoreHandle handle,
                                    int *ret);

MXNET_DLL int MXKVStoreIsWorkerNode(int *ret);


MXNET_DLL int MXKVStoreIsServerNode(int *ret);


MXNET_DLL int MXKVStoreIsSchedulerNode(int *ret);

MXNET_DLL int MXKVStoreBarrier(KVStoreHandle handle);

MXNET_DLL int MXKVStoreSetBarrierBeforeExit(KVStoreHandle handle,
                                            const int barrier_before_exit);

typedef void (MXKVStoreServerController)(int head,
                                         const char *body,
                                         void *controller_handle);

MXNET_DLL int MXKVStoreRunServer(KVStoreHandle handle,
                                 MXKVStoreServerController controller,
                                 void *controller_handle);

MXNET_DLL int MXKVStoreSendCommmandToServers(KVStoreHandle handle,
                                             int cmd_id,
                                             const char* cmd_body);

MXNET_DLL int MXKVStoreGetNumDeadNode(KVStoreHandle handle,
                                      const int node_id,
                                      int *number,
                                      const int timeout_sec DEFAULT(60));

MXNET_DLL int MXRecordIOWriterCreate(const char *uri, RecordIOHandle *out);

MXNET_DLL int MXRecordIOWriterFree(RecordIOHandle handle);

MXNET_DLL int MXRecordIOWriterWriteRecord(RecordIOHandle handle,
                                          const char *buf, size_t size);

MXNET_DLL int MXRecordIOWriterTell(RecordIOHandle handle, size_t *pos);

MXNET_DLL int MXRecordIOReaderCreate(const char *uri, RecordIOHandle *out);

MXNET_DLL int MXRecordIOReaderFree(RecordIOHandle handle);

MXNET_DLL int MXRecordIOReaderReadRecord(RecordIOHandle handle,
                                        char const **buf, size_t *size);

MXNET_DLL int MXRecordIOReaderSeek(RecordIOHandle handle, size_t pos);

MXNET_DLL int MXRecordIOReaderTell(RecordIOHandle handle, size_t *pos);

MXNET_DLL int MXRtcCreate(char* name, uint32_t num_input, uint32_t num_output,
                          char** input_names, char** output_names,
                          NDArrayHandle* inputs, NDArrayHandle* outputs,
                          char* kernel, RtcHandle *out);

MXNET_DLL int MXRtcPush(RtcHandle handle, uint32_t num_input, uint32_t num_output,
                        NDArrayHandle* inputs, NDArrayHandle* outputs,
                        uint32_t gridDimX,
                        uint32_t gridDimY,
                        uint32_t gridDimZ,
                        uint32_t blockDimX,
                        uint32_t blockDimY,
                        uint32_t blockDimZ);

MXNET_DLL int MXRtcFree(RtcHandle handle);
/*
 * \brief register custom operators from frontend.
 * \param op_type name of custom op
 * \param creator
 */
MXNET_DLL int MXCustomOpRegister(const char* op_type, CustomOpPropCreator creator);
/*
 * \brief record custom function for backward later.
 * \param num_inputs number of input NDArrays.
 * \param inputs handle to input NDArrays.
 * \param num_outputs number of output NDArrays.
 * \param outputs handle to output NDArrays.
 * \param callbacks callbacks for backward function.
 */
MXNET_DLL int MXCustomFunctionRecord(int num_inputs, NDArrayHandle *inputs,
                                     int num_outputs, NDArrayHandle *outputs,
                                     struct MXCallbackList *callbacks);
/*
 * \brief create cuda rtc module
 * \param source cuda source code
 * \param num_options number of compiler flags
 * \param options compiler flags
 * \param num_exports number of exported function names
 * \param exported function names
 * \param out handle to created module
 */
MXNET_DLL int MXRtcCudaModuleCreate(const char* source, int num_options,
                                    const char** options, int num_exports,
                                    const char** exports, CudaModuleHandle *out);
/*
 * \brief delete cuda rtc module
 * \param handle handle to cuda module
 */
MXNET_DLL int MXRtcCudaModuleFree(CudaModuleHandle handle);
/*
 * \brief get kernel from module
 * \param handle handle to cuda module
 * \param name name of kernel function
 * \param num_args number of arguments
 * \param is_ndarray whether argument is ndarray
 * \param is_const whether argument is constant
 * \param arg_types data type of arguments
 * \param out created kernel
 */
MXNET_DLL int MXRtcCudaKernelCreate(CudaModuleHandle handle, const char* name,
                                    int num_args, int* is_ndarray, int* is_const,
                                    int* arg_types, CudaKernelHandle *out);
/*
 * \brief delete kernel
 * \param handle handle to previously created kernel
 */
MXNET_DLL int MXRtcCudaKernelFree(CudaKernelHandle handle);
/*
 * \brief launch cuda kernel
 * \param handle handle to kernel
 * \param dev_id (GPU) device id
 * \param args pointer to arguments
 * \param grid_dim_x grid dimension x
 * \param grid_dim_y grid dimension y
 * \param grid_dim_z grid dimension z
 * \param block_dim_x block dimension x
 * \param block_dim_y block dimension y
 * \param block_dim_z block dimension z
 * \param shared_mem size of dynamically allocated shared memory
 */
MXNET_DLL int MXRtcCudaKernelCall(CudaKernelHandle handle, int dev_id, void** args,
                                  uint32_t grid_dim_x, uint32_t grid_dim_y,
                                  uint32_t grid_dim_z, uint32_t block_dim_x,
                                  uint32_t block_dim_y, uint32_t block_dim_z,
                                  uint32_t shared_mem);
MXNET_DLL int MXNDArrayGetSharedMemHandle(NDArrayHandle handle, int* shared_pid,
                                          int* shared_id);
MXNET_DLL int MXNDArrayCreateFromSharedMem(int shared_pid, int shared_id, const uint32_t *shape,
                                           uint32_t ndim, int dtype, NDArrayHandle *out);

MXNET_DLL int MXStorageEmptyCache(int dev_type, int dev_id);

MXNET_DLL int MXNDArrayCreateFromSharedMemEx(int shared_pid, int shared_id, const int *shape,
                                             int ndim, int dtype, NDArrayHandle *out);

MXNET_DLL int MXEnginePushAsync(EngineAsyncFunc async_func, void* func_param,
                                EngineFuncParamDeleter deleter, ContextHandle ctx_handle,
                                EngineVarHandle const_vars_handle, int num_const_vars,
                                EngineVarHandle mutable_vars_handle, int num_mutable_vars,
                                EngineFnPropertyHandle prop_handle DEFAULT(NULL),
                                int priority DEFAULT(0), const char* opr_name DEFAULT(NULL),
                                bool wait DEFAULT(false));

MXNET_DLL int MXEnginePushSync(EngineSyncFunc sync_func, void* func_param,
                               EngineFuncParamDeleter deleter, ContextHandle ctx_handle,
                               EngineVarHandle const_vars_handle, int num_const_vars,
                               EngineVarHandle mutable_vars_handle, int num_mutable_vars,
                               EngineFnPropertyHandle prop_handle DEFAULT(NULL),
                               int priority DEFAULT(0), const char* opr_name DEFAULT(NULL));
MXNET_DLL int MXShallowCopyNDArray(NDArrayHandle src, NDArrayHandle* out);
MXNET_DLL int MXShallowCopySymbol(SymbolHandle src, SymbolHandle * out);

MXNET_DLL int MXEnginePushAsyncND(EngineAsyncFunc async_func, void* func_param,
                                  EngineFuncParamDeleter deleter, ContextHandle ctx_handle,
                                  NDArrayHandle* const_nds_handle, int num_const_nds,
                                  NDArrayHandle* mutable_nds_handle, int num_mutable_nds,
                                  EngineFnPropertyHandle prop_handle DEFAULT(NULL),
                                  int priority DEFAULT(0), const char* opr_name DEFAULT(NULL),
                                  bool wait DEFAULT(false));

MXNET_DLL int MXEnginePushSyncND(EngineSyncFunc sync_func, void* func_param,
                                 EngineFuncParamDeleter deleter, ContextHandle ctx_handle,
                                 NDArrayHandle* const_nds_handle, int num_const_nds,
                                 NDArrayHandle* mutable_nds_handle, int num_mutable_nds,
                                 EngineFnPropertyHandle prop_handle DEFAULT(NULL),
                                 int priority DEFAULT(0), const char* opr_name DEFAULT(NULL));

#ifdef __cplusplus
}
#endif  // __cplusplus

#endif  // MXNET_C_API_H_