BentoService API

BentoService

class bentoml.BentoService

BentoService is the base component for building prediction services using BentoML.

BentoService provide an abstraction for describing model artifacts and environment dependencies required for a prediction service. And allows users to write custom prediction API handling logic via BentoService API callback function.

Each BentoService can contain multiple models via the BentoML Artifact class, and can define multiple APIs for accessing this service. Each API should specify a type of Handler, which defines the expected input data format for this API.

>>>  from bentoml import BentoService, env, api, artifacts, ver
>>>  from bentoml.handlers import DataframeHandler
>>>  from bentoml.artifact import SklearnModelArtifact
>>>
>>>  @ver(major=1, minor=4)
>>>  @artifacts([SklearnModelArtifact('clf')])
>>>  @env(pip_dependencies=["scikit-learn"])
>>>  class MyMLService(BentoService):
>>>
>>>     @api(DataframeHandler)
>>>     def predict(self, df):
>>>         return self.artifacts.clf.predict(df)
>>>
>>>  bento_service = MyMLService()
>>>  bento_service.pack('clf', trained_classifier_model)
>>>  bento_service.save_to_dir('/bentoml_bundles')
name()

return BentoService name

versioneer()

Function used to generate a new version string when saving a new BentoService bundle. User can also override this function to get a customized version format

set_version(version_str=None)

Manually override the version of this BentoService instance

get_service_apis()

Return a list of user defined API functions

Returns

List of user defined API functions

Return type

list(BentoServiceAPI)

bentoml.BentoService.artifacts()

returns a dictionary of packed artifacts from the artifact name to the artifact model instance in its native form

pack(name, *args, *kwargs)

BentoService#pack method is used for packing trained model instances with a BentoService instance and make it ready for BentoService#save.

Parameters

  • name – name of the declared model artifact

  • args – args passing to the target model artifact to be packed

  • kwargs – kwargs passing to the target model artifact to be packed

Returns

this BentoService instance

pack(*args, **kwargs)

Deprecated: Legacy BentoService#pack class method, which can be used to initialize a BentoService instance along with trained model artifacts. This will be deprecated soon:

Parameters

  • args – args passing to the BentoService class

  • kwargs – kwargs passing to the BentoService class and (artifact_name, args) pair for creating declared model artifacts

Returns

a new BentoService instance

save(base_path=None, version=None)

Save and register this BentoService via BentoML’s built-in model management system. BentoML by default keeps track of all the SavedBundle’s files and metadata in local file system under the $BENTOML_HOME(~/bentoml) directory. Users can also configure BentoML to save their BentoService to a shared Database and cloud object storage such as AWS S3.

Parameters

  • base_path – optional - override repository base path

  • version – optional - save with version override

Returns

saved_path: file path to where the BentoService is saved

save_to_dir(path, version=None)

Save this BentoService along with all its artifacts, source code and dependencies to target file path, assuming path exist and empty. If target path is not empty, this call may override existing files in the given path.

Parameters

  • (str) (path) – Destination of where the bento service will be saved

  • version – optional - save with version override

api

bentoml.api(handler_cls, *args, **kwargs)

Decorator for adding api to a BentoService

Parameters

  • handler_cls (bentoml.handlers.BentoHandler) – The handler class for the API function.

  • api_name (str, optional) – API name to replace function name

  • api_doc (str, optional) – Docstring for API function

  • **kwargs – Additional keyword arguments for handler class. Please reference to what arguments are available for the particular handler

Raises

InvalidArgument – API name must contains only letters

>>> from bentoml import BentoService, api
>>> from bentoml.handlers import JsonHandler, DataframeHandler
>>>
>>> class FraudDetectionAndIdentityService(BentoService):
>>>
>>>     @api(JsonHandler)
>>>     def fraud_detect(self, parsed_json):
>>>         # do something
>>>
>>>     @api(DataframeHandler, input_json_orient='records')
>>>     def identity(self, df):
>>>         # do something

env

bentoml.env(pip_dependencies=None, auto_pip_dependencies=False, requirements_txt_file=None, conda_channels=None, conda_dependencies=None, setup_sh=None, docker_base_image=None)

Define environment and dependencies required for the BentoService being created

Parameters

  • pip_dependencies – list of pip_dependencies required, specified by package name or with specified version {package_name}=={package_version}

  • auto_pip_dependencies – (Beta) whether to automatically find all the required pip dependencies and pin their version

  • requirements_txt_file – pip dependencies in the form of a requirements.txt file, this can be a relative path to the requirements.txt file or the content of the file

  • conda_channels – extra conda channels to be used

  • conda_dependencies – list of conda dependencies required

  • setup_sh – user defined setup bash script, it is executed in docker build time

  • docker_base_image – used when generating Dockerfile in saved bundle

artifacts

bentoml.artifacts(artifacts)

Define artifacts required to be bundled with a BentoService

Parameters

artifacts (list(bentoml.artifact.BentoServiceArtifact)) – A list of desired artifacts required by this BentoService

ver

bentoml.ver(major, minor)

Decorator for specifying the version of a custom BentoService.

Parameters

  • major (int) – Major version number for Bento Service

  • minor (int) – Minor version number for Bento Service

BentoML uses semantic versioning for BentoService distribution:

  • MAJOR is incremented when you make breaking API changes

  • MINOR is incremented when you add new functionality without breaking the existing API or functionality

  • PATCH is incremented when you make backwards-compatible bug fixes

‘Patch’ is provided(or auto generated) when calling BentoService#save, while ‘Major’ and ‘Minor’ can be defined with ‘@ver’ decorator

>>>  @ver(major=1, minor=4)
>>>  @artifacts([PickleArtifact('model')])
>>>  class MyMLService(BentoService):
>>>     pass
>>>
>>>  svc = MyMLService()
>>>  svc.pack("model", trained_classifier)
>>>  svc.set_version("2019-08.iteration20")
>>>  svc.save()
>>>  # The final produced BentoService bundle will have version:
>>>  # "1.4.2019-08.iteration20"

save

bentoml.save(bento_service, base_path=None, version=None)

Save and register the given BentoService via BentoML’s built-in model management system. BentoML by default keeps track of all the SavedBundle’s files and metadata in local file system under the $BENTOML_HOME(~/bentoml) directory. Users can also configure BentoML to save their BentoService to a shared Database and cloud object storage such as AWS S3.

Parameters

  • bento_service – target BentoService instance to be saved

  • base_path – optional - override repository base path

  • version – optional - save with version override

Returns

saved_path: file path to where the BentoService is saved

save_to_dir

bentoml.save_to_dir(bento_service, path, version=None, silent=False)

Save given BentoService along with all its artifacts, source code and dependencies to target file path, assuming path exist and empty. If target path is not empty, this call may override existing files in the given path.

Parameters

  • (bentoml.service.BentoService) (bento_service) – a Bento Service instance

  • (str) (version) – Destination of where the bento service will be saved

  • (str) – Override the service version with given version string

  • (boolean) (silent) – whether to hide the log message showing target save path

load

bentoml.load(bundle_path)

Load bento service from local file path or s3 path

Parameters

bundle_path (str) – The path that contains saved BentoService bundle, supporting both local file path and s3 path

Returns

a loaded BentoService instance

Return type

bentoml.service.BentoService