Using the CLI tool

Quickstart

0. Prerequisites

You will need to upload to S3 a .tar.gz file, including:

the trained model file(s)
an inference handler script in code/
an S3 bucket to store the model

About the model

It may be just a model (e.g., pytorch_model.pt) or a whole set of files as, for example, with Hugging Face models (e.g., WellcomeBertMesh/...) IMPORTANT: If you have a folder, It's very important you don't zip the folder, but the contents of the folder itself.

About the handler script.

Note that some models require an inference handler script, implementing the following Sagemaker interface functions:

input_fn: responsible for pre-processing the input
model_fn: responsible for loading the model
predict_fn: responsible for running the model on the input data
output_fn: post-processing of the model's output

See the example entrypoints in sage/handlers folder for examples. Note that in model_fn, you should refer to the model's path without the tar.gz extension, i.e. as if the model were local and already unzipped (SageMaker will automatically unzip the model for you).

Zipping and Uploading to S3

You can create an S3 bucket via:

aws s3 mb s3://<bucket-name>

Go to the folder of your model, and add the entrypoint file to a folder inside named code/. Example:

mkdir <path-to-model>/code
cp sage/handlers/pytorch/inference.py <path-to-model>/code/

Next, zip your local model:

cd <path-to-model>
tar -czvf model.tar.gz *

Upload the zipped model to S3:

aws s3 cp model.tar.gz s3://<bucket-name>

1. Install dependencies and activate environment

curl -sSL https://install.python-poetry.org | python3 -
poetry install
poetry shell

2. Deploy an inference endpoint

Deploys a model to an inference endpoint. The model can be either from a local path or an ECR URI.

sage deploy 
    <image-uri> \
    <task> \
    <role> \
    --model-path <model-path> \
    --instance-count <instance-count> \
    --instance-type <instance-type> \
    --endpoint-name <endpoint-name>

image-uri: Currently, we support four image-uri frameworks for deployment, namely:
- aws: This is where you specify an image URI that is available in ECR. This image will be used as the entrypoint for the deployment app.
- pytorch: This is where you specify a path to a PyTorch model in an S3 bucket. Model must be tar-gzip compressed.
- sklearn: This is where you specify a path to a scikit-learn model in an S3 bucket. Model must be tar-gzip compressed.
- transformers: This is where a model from the HuggingFace model repository is deployed. The model name must be specified.
task means the type of task, by default text-classification
role here means your arn:... role with permissions for sagemaker
model-path is the path to s3 where your model lies. You can also use model names if using hugging face,
but many of them are not supported.
instance-type is the type of instance from AWS (e.g, ml.m5.4xlarge), or local to run everything locally in a Docker Container
endpoint-name give a name to your endpoint. This will be used when calling prediction.

In addition to these supported frameworks, the deployment can be either local or remote. For local deployment, the --instance-type local flag must be specified. For remote deployment, specify a SageMaker instance type, e.g. --instance-type ml.m5.large.

3. List endpoint

sage list

Initially, the endpoint will be in the Creating state. Wait until it is in the InService state.

4. Run inference

sage predict <endpoint-name> "This is a test sentence."

The output of the inference call will be displayed to stdout.

Other commands

Logs

Displays the logs of a deployed endpoint.

sage logs \
    --endpoint-name <endpoint-name>

Delete endpoint

Deletes a deployed endpoint.

sage delete \
    <endpoint-name>

Examples

In this section, we will deploy several models as examples.

1. Custom `Hugging Face` model

Download, for example, WellcomeBertMesh:

git lfs install
git clone https://huggingface.co/Wellcome/WellcomeBertMesh

Add the custom handler

cd WellcomeBertMesh
mkdir code
cp sage/handlers/huggingface_bertmesh/inference.py code/

Zip everything

cd WellcomeBertMesh
tar -czvf model.tar.gz *

Upload to S3

aws s3 cp model.tar.gz s3://<bucket-name>

Deploy the model

Activate your poetry shell and run the deploy command.

poetry shell

sage deploy \
    transformers \
    text-classification \
    <arn-role> \
    --model-path s3://<bucket-name>/model.tar.gz \
    --endpoint-name wellcome \
    --instance-type ml.m5.4xlarge

This will deploy the hugging face model to a remote sagemaker endpoint.

Run inference:

Next we'll run the inference command on this entrypoint.

sage predict \
    wellcome \
    "This is a test sentence."

You should get a Result: b'[{"label": "Humans", "score": 0.8084890842437744}]' output.

2. Local `pytorch` model

We provide an example script to load the model and store it in a tar.gz archive. Note that this is a dummy model intended for demonstration only. You can find the script in scripts/save_pt_dummy_model.py

python scripts/save_pt_dummy_model.py

That script already includes the pytorch inference file inside, so no need to copy it.

Note that you need to run this script from an environment with PyTorch 2.0.0 installed. We purposefully do not include PyTorch in the pyproject.toml file as the CLI itself does not need it and we want to keep the dependencies minimal.

Upload to S3

You should now have a dummy.pt.tar.gz. file on your disk. Upload it to S3:

aws s3 cp dummy.pt.tar.gz s3://<bucket-name>

Deploy the model

Activate your poetry shell and run the deploy command.

poetry shell

sage deploy \
    pytorch \
    text-classification \
    <arn-role> \
    --model-path s3://<bucket-name>/dummy.pt.tar.gz \
    --endpoint-name test \
    --instance-type local

This will deploy the dummy pytorch model to your local machine.

Run inference:

Next we'll run the inference command on this entrypoint.

sage predict \
    test \
    "This is a test sentence." \
    --local

You should get a Result: 1 output. This is the output of the dummy model.

License

wellcometrust/sage

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