The NNStreamer Service API provides interfaces to store and fetch the pipeline description for AI application developers.

Required Header

#include <nnstreamer/ml-api-service.h>

Overview

The NNStreamer Service API provides utility interfaces for AI application developers.

This function allows the following operations with NNStreamer:

Set and get the pipeline description with a given name.
Delete the pipeline description with a given name.

Note that this function set is supposed to be thread-safe.

Related Features

This function is related with the following features:

http://tizen.org/feature/machine_learning
http://tizen.org/feature/machine_learning.service

Functions
int	ml_service_start (ml_service_h handle)
	Starts the process of machine learning service.
int	ml_service_stop (ml_service_h handle)
	Stops the process of machine learning service.
int	ml_service_destroy (ml_service_h handle)
	Destroys the handle for machine learning service.
int	ml_service_pipeline_set (const char name, const char pipeline_desc)
	Sets the pipeline description with a given name.
int	ml_service_pipeline_get (const char name, char *pipeline_desc)
	Gets the pipeline description with a given name.
int	ml_service_pipeline_delete (const char *name)
	Deletes the pipeline description with a given name.
int	ml_service_pipeline_launch (const char name, ml_service_h handle)
	Launches the pipeline of given service and gets the service handle.
int	ml_service_pipeline_get_state (ml_service_h handle, ml_pipeline_state_e *state)
	Gets the state of given handle's pipeline.
int	ml_service_query_create (ml_option_h option, ml_service_h *handle)
	Creates query service handle with given ml-option handle.
int	ml_service_query_request (ml_service_h handle, const ml_tensors_data_h input, ml_tensors_data_h *output)
	Requests the query service to process the input and produce an output.
int	ml_service_model_register (const char name, const char path, const bool activate, const char description, unsigned int version)
	Registers new information of a neural network model.
int	ml_service_model_update_description (const char name, const unsigned int version, const char description)
	Updates the description of neural network model with given name and version.
int	ml_service_model_activate (const char *name, const unsigned int version)
	Activates a neural network model with given name and version.
int	ml_service_model_get (const char name, const unsigned int version, ml_information_h info)
	Gets the information of neural network model with given name and version.
int	ml_service_model_get_activated (const char name, ml_information_h info)
	Gets the information of activated neural network model with given name.
int	ml_service_model_get_all (const char name, ml_information_list_h info_list)
	Gets the list of neural network model with given name.
int	ml_service_model_delete (const char *name, const unsigned int version)
	Deletes a model information with given name and version from machine learning service.
int	ml_service_resource_add (const char name, const char path, const char *description)
	Adds new information of machine learning resources those contain images, audio samples, binary files, and so on.
int	ml_service_resource_delete (const char *name)
	Deletes the information of the resources from machine learning service.
int	ml_service_resource_get (const char name, ml_information_list_h res)
	Gets the information of the resources from machine learning service.
Typedefs
typedef void *	ml_service_h
	A handle for ml-service instance.

Typedef Documentation

typedef void* ml_service_h

A handle for ml-service instance.

Since :: 7.0

Function Documentation

int ml_service_destroy ( ml_service_h handle )

Destroys the handle for machine learning service.

If given service handle is created by ml_service_pipeline_launch(), this requests machine learning agent to destroy the pipeline.

Since :: 7.0

Parameters:

[in] handle The handle of ml-service.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	The parameter is invalid.
ML_ERROR_STREAMS_PIPE	Failed to stop the process.

int ml_service_model_activate	(	const char *	name,
		const unsigned int	version
	)

Activates a neural network model with given name and version.

Since :: 8.0

Parameters:

[in]	name	The unique name to indicate the model.
[in]	version	The version of registered model.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Given parameter is invalid.
ML_ERROR_IO_ERROR	The operation of DB or filesystem has failed.

int ml_service_model_delete	(	const char *	name,
		const unsigned int	version
	)

Deletes a model information with given name and version from machine learning service.

Since :: 8.0

Remarks:: This does not remove the model file from file system. If version is 0, machine learning service will delete all information with given name.

Parameters:

[in]	name	The unique name to indicate the model.
[in]	version	The version of registered model.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Given parameter is invalid.
ML_ERROR_IO_ERROR	The operation of DB or filesystem has failed.

int ml_service_model_get	(	const char *	name,
		const unsigned int	version,
		ml_information_h *	info
	)

Gets the information of neural network model with given name and version.

Since :: 8.0

Remarks:: If the function succeeds, the info should be released using ml_information_destroy().

Parameters:

[in]	name	The unique name to indicate the model.
[in]	version	The version of registered model.
[out]	info	The handle of model information.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Given parameter is invalid.
ML_ERROR_IO_ERROR	The operation of DB or filesystem has failed.
ML_ERROR_OUT_OF_MEMORY	Failed to allocate required memory.

int ml_service_model_get_activated	(	const char *	name,
		ml_information_h *	info
	)

Gets the information of activated neural network model with given name.

Since :: 8.0

Remarks:: If the function succeeds, the info should be released using ml_information_destroy().

Parameters:

[in]	name	The unique name to indicate the model.
[out]	info	The handle of activated model.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Given parameter is invalid.
ML_ERROR_IO_ERROR	The operation of DB or filesystem has failed.
ML_ERROR_OUT_OF_MEMORY	Failed to allocate required memory.

int ml_service_model_get_all	(	const char *	name,
		ml_information_list_h *	info_list
	)

Gets the list of neural network model with given name.

Since :: 8.0

Remarks:: If the function succeeds, the info_list should be released using ml_information_list_destroy().

Parameters:

[in]	name	The unique name to indicate the model.
[out]	info_list	The handle of list of registered models.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Given parameter is invalid.
ML_ERROR_IO_ERROR	The operation of DB or filesystem has failed.
ML_ERROR_OUT_OF_MEMORY	Failed to allocate required memory.

int ml_service_model_register	(	const char *	name,
		const char *	path,
		const bool	activate,
		const char *	description,
		unsigned int *	version
	)

Registers new information of a neural network model.

Since :: 8.0

Remarks:: Only one model can be activated with given name. If same name is already registered in machine learning service, this returns no error and old model will be deactivated when the flag activate is true.; http://tizen.org/privilege/mediastorage is needed if model file is relevant to media storage.; http://tizen.org/privilege/externalstorage is needed if model file is relevant to external storage.

Parameters:

[in]	name	The unique name to indicate the model.
[in]	path	The path to neural network model.
[in]	activate	The flag to set the model to be activated.
[in]	description	Nullable, description for neural network model.
[out]	version	The version of registered model.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_PERMISSION_DENIED	The application does not have the privilege to access to the storage.
ML_ERROR_INVALID_PARAMETER	Given parameter is invalid.
ML_ERROR_IO_ERROR	The operation of DB or filesystem has failed.

Here is an example of the usage:

 // The machine-learning service API for model provides a method to share model files those can be used for ML application.

 const gchar *key = "imgcls-mobilenet"; // The name shared among ML applications.
 gchar *model_path = g_strdup_printf ("%s/%s", app_get_shared_resource_path (), "mobilenet_v2.tflite"); // Provide the absolute file path.
 const bool is_active = true; // Parameter deciding whether to activate this model or not.
 const gchar *description = "This is the description of mobilenet_v2 model ..."; // Model description parameter.
 unsigned int version; // Out parameter for the version of registered model.

 // Register the model via ML Service API.
 int status;
 status = ml_service_model_register (key, model_path, is_active, description, &version);
 if (status != ML_ERROR_NONE) {
   // Handle error case.
 }

 const gchar *key = "imgcls-mobilenet"; // The name shared among ML applications.
 gchar *model_path; // Out parameter for the path of registered model.
 ml_information_h activated_model_info; // The ml_information handle for the activated model.

 // Get the model which is registered and activated by ML Service API.
 int status;
 status = ml_service_model_get_activated (key, &activated_model_info);
 if (status == ML_ERROR_NONE) {
   // Get the path of the model.
   gchar *activated_model_path;
   status = ml_information_get (activated_model_info, "path", (void **) &activated_model_path);
   model_path = g_strdup (activated_model_path);
 } else {
   // Handle error case.
 }

 ml_information_destroy (activated_model_info); // Release the information handle.

 // Do ML things with the variable `model_path`.

int ml_service_model_update_description	(	const char *	name,
		const unsigned int	version,
		const char *	description
	)

Updates the description of neural network model with given name and version.

Since :: 8.0

Parameters:

[in]	name	The unique name to indicate the model.
[in]	version	The version of registered model.
[in]	description	The description for neural network model.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Given parameter is invalid.
ML_ERROR_IO_ERROR	The operation of DB or filesystem has failed.

int ml_service_pipeline_delete ( const char * name )

Deletes the pipeline description with a given name.

Since :: 7.0

Parameters:

[in] name The unique name to delete.

Returns:: 0 on success. Otherwise a negative error value.

Note:: If the name does not exist in the database, this function returns ML_ERROR_NONE without any errors.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Fail. The parameter is invalid.
ML_ERROR_IO_ERROR	The operation of DB or filesystem has failed.

int ml_service_pipeline_get	(	const char *	name,
		char **	pipeline_desc
	)

Gets the pipeline description with a given name.

Since :: 7.0

Remarks:: If the function succeeds, pipeline_desc must be released using free().

Parameters:

[in]	name	The unique name to retrieve.
[out]	pipeline_desc	The pipeline corresponding with the given name.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Fail. The parameter is invalid.
ML_ERROR_IO_ERROR	The operation of DB or filesystem has failed.

int ml_service_pipeline_get_state	(	ml_service_h	handle,
		ml_pipeline_state_e *	state
	)

Gets the state of given handle's pipeline.

Since :: 7.0

Parameters:

[in]	handle	The service handle.
[out]	state	The pipeline state.

Returns:: 0 on Success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Fail. The parameter is invalid.
ML_ERROR_STREAMS_PIPE	Failed to access the pipeline state.

int ml_service_pipeline_launch	(	const char *	name,
		ml_service_h *	handle
	)

Launches the pipeline of given service and gets the service handle.

This requests machine learning agent daemon to launch a new pipeline of given service. The pipeline of service name should be set.

Since :: 7.0

Remarks:: The handle should be destroyed using ml_service_destroy().

Parameters:

[in]	name	The service name.
[out]	handle	Newly created service handle is returned.

Returns:: 0 on Success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Fail. The parameter is invalid.
ML_ERROR_OUT_OF_MEMORY	Failed to allocate required memory.
ML_ERROR_IO_ERROR	The operation of DB or filesystem has failed.
ML_ERROR_STREAMS_PIPE	Failed to launch the pipeline.

int ml_service_pipeline_set	(	const char *	name,
		const char *	pipeline_desc
	)

Sets the pipeline description with a given name.

Since :: 7.0

Remarks:: If the name already exists, the pipeline description is overwritten. Overwriting an existing description is restricted to APP/service that set it. However, users should keep their name unexposed to prevent unexpected overwriting.

Parameters:

[in]	name	Unique name to retrieve the associated pipeline description.
[in]	pipeline_desc	The pipeline description to be stored.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Fail. The parameter is invalid.
ML_ERROR_IO_ERROR	The operation of DB or filesystem has failed.

Here is an example of the usage:

 const gchar my_pipeline[] = "videotestsrc is-live=true ! videoconvert ! tensor_converter ! tensor_sink async=false";
 gchar *pipeline;
 int status;
 ml_pipeline_h handle;

 // Set pipeline description.
 status = ml_service_pipeline_set ("my_pipeline", my_pipeline);
 if (status != ML_ERROR_NONE) {
   // handle error case
   goto error;
 }

 // Example to construct a pipeline with stored pipeline description.
 // Users may register intelligence pipelines for other processes and fetch such registered pipelines.
 // For example, a developer adds a pipeline which includes preprocessing and invoking a neural network model,
 // then an application can fetch and construct this for intelligence service.
 status = ml_service_pipeline_get ("my_pipeline", &pipeline);
 if (status != ML_ERROR_NONE) {
   // handle error case
   goto error;
 }

 status = ml_pipeline_construct (pipeline, NULL, NULL, &handle);
 if (status != ML_ERROR_NONE) {
   // handle error case
   goto error;
 }

 error:
 ml_pipeline_destroy (handle);
 g_free (pipeline);

int ml_service_query_create	(	ml_option_h	option,
		ml_service_h *	handle
	)

Creates query service handle with given ml-option handle.

Since :: 7.0

Remarks:: The handle should be destroyed using ml_service_destroy().

Parameters:

[in]	option	The option used for creating query service.
[out]	handle	Newly created query service handle is returned.

Returns:: 0 on Success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Fail. The parameter is invalid.
ML_ERROR_OUT_OF_MEMORY	Failed to allocate required memory.
ML_ERROR_STREAMS_PIPE	Failed to launch the pipeline.
ML_ERROR_TRY_AGAIN	The pipeline is not ready yet.

int ml_service_query_request	(	ml_service_h	handle,
		const ml_tensors_data_h	input,
		ml_tensors_data_h *	output
	)

Requests the query service to process the input and produce an output.

Since :: 7.0

Remarks:: If the function succeeds, the output should be released using ml_tensors_data_destroy().

Parameters:

[in]	handle	The query service handle created by ml_service_query_create().
[in]	input	The handle of input tensors.
[out]	output	The handle of output tensors.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Given parameter is invalid.
ML_ERROR_OUT_OF_MEMORY	Failed to allocate required memory.
ML_ERROR_STREAMS_PIPE	The input is incompatible with the pipeline.
ML_ERROR_TRY_AGAIN	The pipeline is not ready yet.
ML_ERROR_TIMED_OUT	Failed to get output from the query service.

int ml_service_resource_add	(	const char *	name,
		const char *	path,
		const char *	description
	)

Adds new information of machine learning resources those contain images, audio samples, binary files, and so on.

Since :: 8.0

Remarks:: If same name is already registered in machine learning service, this returns no error and the list of resource files will be updated.; http://tizen.org/privilege/mediastorage is needed if model file is relevant to media storage.; http://tizen.org/privilege/externalstorage is needed if model file is relevant to external storage.

Parameters:

[in]	name	The unique name to indicate the resources.
[in]	path	The path to machine learning resources.
[in]	description	Nullable, description for machine learning resources.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_PERMISSION_DENIED	The application does not have the privilege to access to the storage.
ML_ERROR_INVALID_PARAMETER	Given parameter is invalid.
ML_ERROR_IO_ERROR	The operation of DB or filesystem has failed.

Here is an example of the usage:

 // The machine-learning resource API provides a method to share the data files those can be used for training or inferencing AI model.
 // Users may generate preprocessed data file, and add it into machine-learning service.
 // Then an application can fetch the data set for retraining an AI model.

 const char *my_resources[3] = {
   "/path/to/resources/my_res1.dat",
   "/path/to/resources/my_res2.dat"
   "/path/to/resources/my_res3.dat"
 };

 int status;
 unsigned int i, length;
 ml_information_list_h resources;
 ml_information_h res;
 char *path_to_resource;

 // Add resource files with name "my_resource".
 for (i = 0; i < 3; i++) {
   status = ml_service_resource_add ("my_resource", my_resources[i], "This is my resource data file.");
   if (status != ML_ERROR_NONE) {
     // Handle error case.
   }
 }

 // Get the resources with specific name.
 status = ml_service_resource_get ("my_resource", &resources);
 if (status != ML_ERROR_NONE) {
   // Handle error case.
 }

 status = ml_information_list_length (resources, &length);
 for (i = 0; i < length; i++) {
   status = ml_information_list_get (resources, i, &res);
   // Get the path of added resources.
   status = ml_information_get (res, "path", (void **) &path_to_resource);
 }

 // Release the information handle of resources.
 status = ml_information_list_destroy (resources);

int ml_service_resource_delete ( const char * name )

Deletes the information of the resources from machine learning service.

Since :: 8.0

Remarks:: This does not remove the resource files from file system.

Parameters:

[in] name The unique name to indicate the resources.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Given parameter is invalid.
ML_ERROR_IO_ERROR	The operation of DB or filesystem has failed.

int ml_service_resource_get	(	const char *	name,
		ml_information_list_h *	res
	)

Gets the information of the resources from machine learning service.

Since :: 8.0

Remarks:: If the function succeeds, the res should be released using ml_information_list_destroy().

Parameters:

[in]	name	The unique name to indicate the resources.
[out]	res	The handle of the machine learning resources.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Given parameter is invalid.
ML_ERROR_IO_ERROR	The operation of DB or filesystem has failed.
ML_ERROR_OUT_OF_MEMORY	Failed to allocate required memory.

int ml_service_start ( ml_service_h handle )

Starts the process of machine learning service.

Since :: 7.0

Parameters:

[in] handle The handle of ml-service.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Given parameter is invalid.
ML_ERROR_STREAMS_PIPE	Failed to start the process.

int ml_service_stop ( ml_service_h handle )

Stops the process of machine learning service.

Since :: 7.0

Parameters:

[in] handle The handle of ml-service.

Returns:: 0 on success. Otherwise a negative error value.

Return values:

ML_ERROR_NONE	Successful.
ML_ERROR_NOT_SUPPORTED	Not supported.
ML_ERROR_INVALID_PARAMETER	Given parameter is invalid.
ML_ERROR_STREAMS_PIPE	Failed to stop the process.

Required Header

Overview

Related Features

Functions

Typedefs

Typedef Documentation

Function Documentation