//   TP_OptimizerRegistrationParams params{
//       TP_OPTIMIZER_REGISTRATION_PARAMS_STRUCT_SIZE};
//   TP_Optimizer optimizer{TP_OPTIMIZER_STRUCT_SIZE};
//   TP_OptimizerConfigs configs{TP_OPTIMIZER_CONFIGS_STRUCT_SIZE};
//   params.optimizer = &optimizer;
//   params.configs = &configs;
//
//   /* Plugin code below */
//    void TF_InitGraph(TP_OptimizerRegistrationParams* params,
//                            TF_Status* status) {

// ip:port
// host:port
TF_CAPI_EXPORT extern void TF_SetTarget(TF_SessionOptions* options,
                                        const char* target);

// Set the config in TF_SessionOptions.options.
// config should be a serialized tensorflow.ConfigProto proto.
// If config was not parsed successfully as a ConfigProto, record the
// error information in *status.
TF_CAPI_EXPORT extern void TF_SetConfig(TF_SessionOptions* options,

typedef struct TFE_ContextOptions TFE_ContextOptions;

// Return a new options object.
TF_CAPI_EXPORT extern TFE_ContextOptions* TFE_NewContextOptions(void);

// Set the config in TF_ContextOptions.options.
// config should be a serialized tensorflow.ConfigProto proto.
// If config was not parsed successfully as a ConfigProto, record the
// error information in *status.
TF_CAPI_EXPORT extern void TFE_ContextOptionsSetConfig(

  std::string device_type_;
  void* c_optimizer_;
};

// Registration function to register a CGraphOptimizer along with plugin configs
// and device type.
void CGraphOptimizerRegister(
    const PluginGraphOptimizerRegistry::Creator& creator,
    const TP_OptimizerConfigs tp_configs, const char* device_type);

}  // namespace grappler
}  // namespace tensorflow

  ///
  /// DEFAULT IMPLEMENTATION: No op.
  void (*flush)(const TF_WritableFile* file, TF_Status* status);

  /// Syncs contents of `*file` with the filesystem.
  ///
  /// This call should block until filesystem confirms that all buffers have
  /// been flushed and persisted.
  ///
  /// DEFAULT IMPLEMENTATION: No op.
  void (*sync)(const TF_WritableFile* file, TF_Status* status);

  /// Closes `*file`.
  ///