PyTorch

PyTorch Estimator

class sagemaker.pytorch.estimator.PyTorch(entry_point, source_dir=None, hyperparameters=None, py_version='py3', framework_version=None, image_name=None, **kwargs)

Bases: sagemaker.estimator.Framework

Handle end-to-end training and deployment of custom PyTorch code.

This Estimator executes an PyTorch script in a managed PyTorch execution environment, within a SageMaker Training Job. The managed PyTorch environment is an Amazon-built Docker container that executes functions defined in the supplied entry_point Python script.

Training is started by calling fit() on this Estimator. After training is complete, calling deploy() creates a hosted SageMaker endpoint and returns an PyTorchPredictor instance that can be used to perform inference against the hosted model.

Technical documentation on preparing PyTorch scripts for SageMaker training and using the PyTorch Estimator is available on the project home-page: https://github.com/aws/sagemaker-python-sdk

Parameters:
  • entry_point (str) – Path (absolute or relative) to the Python source file which should be executed as the entry point to training. This should be compatible with either Python 2.7 or Python 3.5.
  • source_dir (str) – Path (absolute or relative) to a directory with any other training source code dependencies aside from tne entry point file (default: None). Structure within this directory are preserved when training on Amazon SageMaker.
  • hyperparameters (dict) – Hyperparameters that will be used for training (default: None). The hyperparameters are made accessible as a dict[str, str] to the training code on SageMaker. For convenience, this accepts other types for keys and values, but str() will be called to convert them before training.
  • py_version (str) – Python version you want to use for executing your model training code (default: ‘py3’). One of ‘py2’ or ‘py3’.
  • framework_version (str) – PyTorch version you want to use for executing your model training code. List of supported versions https://github.com/aws/sagemaker-python-sdk#pytorch-sagemaker-estimators. If not specified, this will default to 0.4.
  • image_name (str) – If specified, the estimator will use this image for training and hosting, instead of selecting the appropriate SageMaker official image based on framework_version and py_version. It can be an ECR url or dockerhub image and tag. Examples: 123.dkr.ecr.us-west-2.amazonaws.com/my-custom-image:1.0 custom-image:latest.
  • **kwargs – Additional kwargs passed to the Framework constructor.
LATEST_VERSION = '1.1'

The latest version of PyTorch included in the SageMaker pre-built Docker images.

create_model(model_server_workers=None, role=None, vpc_config_override='VPC_CONFIG_DEFAULT', entry_point=None, source_dir=None, dependencies=None, **kwargs)

Create a SageMaker PyTorchModel object that can be deployed to an Endpoint.

Parameters:
  • model_server_workers (int) – Optional. The number of worker processes used by the inference server. If None, server will use one worker per vCPU.
  • role (str) – The ExecutionRoleArn IAM Role ARN for the Model, which is also used during transform jobs. If not specified, the role from the Estimator will be used.
  • vpc_config_override (dict[str, list[str]]) – Optional override for VpcConfig set on the model. Default: use subnets and security groups from this Estimator. * ‘Subnets’ (list[str]): List of subnet ids. * ‘SecurityGroupIds’ (list[str]): List of security group ids.
  • entry_point (str) – Path (absolute or relative) to the local Python source file which should be executed as the entry point to training. If not specified, the training entry point is used.
  • source_dir (str) – Path (absolute or relative) to a directory with any other serving source code dependencies aside from the entry point file. If not specified, the model source directory from training is used.
  • dependencies (list[str]) – A list of paths to directories (absolute or relative) with any additional libraries that will be exported to the container. If not specified, the dependencies from training are used.
  • **kwargs – Additional kwargs passed to the PyTorchModel constructor.
Returns:

A SageMaker PyTorchModel object. See PyTorchModel() for full details.

Return type:

sagemaker.pytorch.model.PyTorchModel

PyTorch Model

class sagemaker.pytorch.model.PyTorchModel(model_data, role, entry_point, image=None, py_version='py3', framework_version='0.4', predictor_cls=<class 'sagemaker.pytorch.model.PyTorchPredictor'>, model_server_workers=None, **kwargs)

Bases: sagemaker.model.FrameworkModel

An PyTorch SageMaker Model that can be deployed to a SageMaker Endpoint.

Initialize an PyTorchModel.

Parameters:
  • model_data (str) – The S3 location of a SageMaker model data .tar.gz file.
  • role (str) – An AWS IAM role (either name or full ARN). The Amazon SageMaker training jobs and APIs that create Amazon SageMaker endpoints use this role to access training data and model artifacts. After the endpoint is created, the inference code might use the IAM role, if it needs to access an AWS resource.
  • entry_point (str) – Path (absolute or relative) to the Python source file which should be executed as the entry point to model hosting. This should be compatible with either Python 2.7 or Python 3.5.
  • image (str) – A Docker image URI (default: None). If not specified, a default image for PyTorch will be used.
  • py_version (str) – Python version you want to use for executing your model training code (default: ‘py3’).
  • framework_version (str) – PyTorch version you want to use for executing your model training code.
  • predictor_cls (callable[str, sagemaker.session.Session]) – A function to call to create a predictor with an endpoint name and SageMaker Session. If specified, deploy() returns the result of invoking this function on the created endpoint name.
  • model_server_workers (int) – Optional. The number of worker processes used by the inference server. If None, server will use one worker per vCPU.
  • **kwargs – Keyword arguments passed to the FrameworkModel initializer.
prepare_container_def(instance_type, accelerator_type=None)

Return a container definition with framework configuration set in model environment variables.

Parameters:
  • instance_type (str) – The EC2 instance type to deploy this Model to. For example, ‘ml.p2.xlarge’.
  • accelerator_type (str) – The Elastic Inference accelerator type to deploy to the instance for loading and making inferences to the model. For example, ‘ml.eia1.medium’.
Returns:

A container definition object usable with the CreateModel API.

Return type:

dict[str, str]

PyTorch Predictor

class sagemaker.pytorch.model.PyTorchPredictor(endpoint_name, sagemaker_session=None)

Bases: sagemaker.predictor.RealTimePredictor

A RealTimePredictor for inference against PyTorch Endpoints.

This is able to serialize Python lists, dictionaries, and numpy arrays to multidimensional tensors for PyTorch inference.

Initialize an PyTorchPredictor.

Parameters:
  • endpoint_name (str) – The name of the endpoint to perform inference on.
  • sagemaker_session (sagemaker.session.Session) – Session object which manages interactions with Amazon SageMaker APIs and any other AWS services needed. If not specified, the estimator creates one using the default AWS configuration chain.