Function Creation

Developer Guide (Latest)

This page describes the steps to create a function within Cloud Functions.

Attention

Please ensure prior to function creation, you’ve installed and configured the NGC CLI for working with the NGC Private Registry.

Functions can be created in one of three ways, listed below, and also visible in the Cloud Functions UI.

function-creation-start.png

  1. Custom Container

  • Enables any container-based workload as long as the container exposes an inference endpoint and a health check.

  • Option to leverage any server, ex. PyTriton, FastAPI, Triton.

  • More easily take advantage of Cloud Functions features such as the Asset Management API for input sizes >200KB, HTTP streaming or gRPC, and partial response reporting.

  • See Container-Based Function Creation.

  1. Triton Model

  1. Helm Chart

  • Enables orchestration across multiple containers. For complex use cases where a single container isn’t flexible enough.

  • Requires one “mini-service” container defined as the inference entry point for the function.

  • Does not support partial response reporting, gRPC or HTTP streaming based invocation.

  • See Helm-Based Function Creation.

Function creation requires your model, container, helm chart and/or static resources to be hosted within NGC Private Registry as a prerequisite. Follow the steps below to optimally configure the NGC CLI to work with NGC Private Registry and Cloud Functions.

Warning

NGC Private Registry has size constraints on layers, images, models and resources.

Ensure that your uploaded resources conform to these constraints.

Generate an NGC Personal API Key

Do this by navigating to the Personal Keys Page. For more details see Generate an NGC Personal API Key.

Note

It’s recommended that the API Key that you generate includes both Cloud Functions and Private Registry scopes to enable ideal Cloud Functions workflows.

Download & Configure the NGC CLI

  1. Navigate to the NGC CLI Installer Page to download the CLI and follow the installation instructions for your platform.

  2. Find your NGC organization name within the NGC Organization Profile Page. This is not the Display Name. For example: qdrlnbkss123.

  3. Run ngc config set and input the Personal API Key generated in the previous step, along with your organization name. If prompted, default to no-team and no-ace.

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> ngc config set Enter API key [****bi9Z]. Choices: [<VALID_APIKEY>, 'no-apikey']: $API_KEY Enter CLI output format type [json]. Choices: ['ascii', 'csv', 'json']: json Enter org [ax3ysqem02xw]. Choices: ['$ORG_NAME']: $ORG_NAME Enter team [no-team]. Choices: ['no-team']: Enter ace [no-ace]. Choices: ['no-ace']:

Authenticate with NGC Docker Registry

  1. Run docker login nvcr.io and input the following, note $oauthtoken is the actual string to input, and $API_KEY is the Personal API key generated in the first step.

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> docker login nvcr.io Username: $oauthtoken Password: $API_KEY

(Optional) Push a Container to NGC Private Registry

You should now be able to push a container to NGC Private Registry. Optionally, validate this by pushing an example container from the samples repository:

  1. First clone and build the docker image.

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> git clone https://github.com/NVIDIA/nv-cloud-function-helpers.git > cd nv-cloud-function-helpers/examples/fastapi_echo_sample > docker build . -t fastapi_echo_sample

  1. Now tag and push the docker image to NGC Private Registry.

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> docker tag fastapi_echo_sample:latest nvcr.io/$ORG_NAME/fastapi_echo_sample:latest > docker push nvcr.io/$ORG_NAME/fastapi_echo_sample:latest

  1. Once this finishes, you’ll now be able to see the new container in the NGC Private Registry Containers Page and it will be available for use in function creation.

Container-based functions require building and pushing a Cloud Functions compatible Docker container image to NGC Private Registry.

Attention

Before proceeding, ensure that you have the NGC CLI installed and configured with an API Key that has the required scopes for Cloud Functions and Private Registry.

See Working with NGC Private Registry for instructions.

Resources

  • Example containers can be found here.

  • The repository also contains helper functions that are useful when authoring your container, including:

    • Helpers that parse Cloud Functions-specific parameters on invocation

    • Helpers that can be used to instrument your container with Cloud Functions compatible logs

    • Helpers for working with assets

  • After container creation, but before proceeding to deployment, it is strongly recommended to validate your container’s configuration locally, see Deployment Validation.

  • It’s always a best practice to emit logs from your inference container. See Logging and Metrics for how to add logs to your container. Cloud Functions also supports third-party logging and metrics emission from your container.

Container Endpoints

Any server can be implemented within the container, as long as it implements the following:

  • For HTTP-based functions, a health check endpoint that returns a 200 HTTP Status Code on success.

  • For gRPC-based functions, a standard gRPC health check. See these docs for more info also gRPC Health Checking.

  • An inference endpoint (this endpoint will be called during function invocation)

These endpoints are expected to be served on the same port, defined as the inferencePort.

Warning

Cloud Functions reserves the following ports on your container for internal monitoring and metrics:

  • Port 8080

  • Port 8010

Composing a FastAPI Container

It’s possible to use any container with Cloud Functions as long as it implements a server with the above endpoints. The below is an example of a FastAPI-based container compatible with Cloud Functions. Clone the full example here.

Create the “requirements.txt” File

requirements.txt

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fastapi==0.110.0 uvicorn==0.29.0


Implement the Server

http_echo_server.py

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import os import time import uvicorn from pydantic import BaseModel from fastapi import FastAPI, status from fastapi.responses import StreamingResponse app = FastAPI() class HealthCheck(BaseModel): status: str = "OK" # Implement the health check endpoint @app.get("/health", tags=["healthcheck"], summary="Perform a Health Check", response_description="Return HTTP Status Code 200 (OK)", status_code=status.HTTP_200_OK, response_model=HealthCheck) def get_health() -> HealthCheck: return HealthCheck(status="OK") class Echo(BaseModel): message: str delay: float = 0.000001 repeats: int = 1 stream: bool = False # Implement the inference endpoint @app.post("/echo") async def echo(echo: Echo): if echo.stream: def stream_text(): for _ in range(echo.repeats): time.sleep(echo.delay) yield f"data:{echo.message}\n\n" return StreamingResponse(stream_text(), media_type="text/event-stream") else: time.sleep(echo.delay) return echo.message*echo.repeats # Serve the endpoints on a port if __name__ == "__main__": uvicorn.run(app, host="0.0.0.0", port=8000, workers=int(os.getenv('WORKER_COUNT', 500)))


Note in the example above, the function’s configuration during creation will be:

  • Inference Protocol: HTTP

  • Inference Endpoint: /echo

  • Health Endpoint: /health

  • Inference Port (also used for health check): 8000

Create the Dockerfile

Dockerfile

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FROM python:3.10.13-bookworm ENV WORKER_COUNT=10 WORKDIR /app COPY requirements.txt ./ RUN python -m pip install --no-cache-dir -U pip && \ python -m pip install --no-cache-dir -r requirements.txt COPY http_echo_server.py /app/ CMD uvicorn http_echo_server:app --host=0.0.0.0 --workers=$WORKER_COUNT


Build the Container & Create the Function

See the Quickstart for remaining steps.

Composing a PyTriton Container

NVIDIA’s PyTriton is a Python native solution of Triton inference server. A minimum version of 0.3.0 is required.

Create the “requirements.txt” File

  • This file should list the Python dependencies required for your model.

  • Add nvidia-pytriton to your requirements.txt file.

Here is an example of a requirements.txt file:

requirements.txt

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--extra-index-url https://pypi.ngc.nvidia.com opencv-python-headless pycocotools matplotlib torch==2.1.0 nvidia-pytriton==0.3.0 numpy


Create the “run.py” File

  1. Your run.py file (or similar python file) needs to define a PyTriton model.

  2. This involves importing your model dependencies, creating a PyTritonServer class with an __init__ function, an _infer_fn function and a run function that serves the inference_function, defining the model name, the inputs and the outputs along with optional configuration.

Here is an example of a run.py file:

run.py

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import numpy as np from pytriton.model_config import ModelConfig, Tensor from pytriton.triton import Triton, TritonConfig import time .... class PyTritonServer: """triton server for timed_sleeper""" def __init__(self): # basically need to accept image, mask(PIL Images), prompt, negative_prompt(str), seed(int) self.model_name = "timed_sleeper" def _infer_fn(self, requests): responses = [] for req in requests: req_data = req.data sleep_duration = numpy_array_to_variable(req_data.get("sleep_duration")) # deal with header dict keys being lowerscale request_parameters_dict = uppercase_keys(req.parameters) time.sleep(sleep_duration) responses.append({"sleep_duration": np.array([sleep_duration])}) return responses def run(self): """run triton server""" with Triton( config=TritonConfig( http_header_forward_pattern="NVCF-*", # this is required http_port=8000, grpc_port=8001, metrics_port=8002, ) ) as triton: triton.bind( model_name="timed_sleeper", infer_func=self._infer_fn, inputs=[ Tensor(name="sleep_duration", dtype=np.uint32, shape=(1,)), ], outputs=[Tensor(name="sleep_duration", dtype=np.uint32, shape=(1,))], config=ModelConfig(batching=False), ) triton.serve() if __name__ == "__main__": server = PyTritonServer() server.run()


Create the “Dockerfile”

  1. Create a file named Dockerfile in your model directory.

  2. It’s strongly recommended to use NVIDIA-optimized containers like CUDA, Pytorch or TensorRT as your base container. They can be downloaded from the NGC Catalog.

  3. Make sure to install your Python requirements in your Dockerfile.

  4. Copy in your model source code, and model weights unless you plan to host them in NGC Private Registry.

Here is an example of a Dockerfile:

Dockerfile

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FROM nvcr.io/nvidia/cuda:12.1.1-devel-ubuntu22.04 RUN apt-get update && apt-get install -y \ git \ python3 \ python3-pip \ python-is-python3 \ libsm6 \ libxext6 \ libxrender-dev \ curl \ && rm -rf /var/lib/apt/lists/* WORKDIR /workspace/ # Install requirements file COPY requirements.txt requirements.txt RUN pip install --no-cache-dir --upgrade pip RUN pip install --no-cache-dir -r requirements.txt ENV DEBIAN_FRONTEND=noninteractive # Copy model source code and weights COPY model_weights /models COPY model_source . COPY run.py . # Set run command to start PyTriton to serve the model CMD python3 run.py


Build the Docker Image

  1. Open a terminal or command prompt.

  2. Navigate to the my_model directory.

  3. Run the following command to build the docker image:

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docker build -t my_model_image .

Replace my_model_image with the desired name for your docker image.

Push the Docker Image

Before beginning, ensure that you have authenticated with the NGC Docker Registry.

  1. Tag and push the docker image to NGC Private Registry.

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> docker tag my_model_image:latest nvcr.io/$ORG_NAME/my_model_image:latest > docker push nvcr.io/$ORG_NAME/my_model_image:latest

Create the Function

  1. Create the function via API by running the following curl with an $API_KEY and your $ORG_NAME. In this example, we defined the inference endpoint as 8000 and are using the default inference and health endpoint paths.

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curl --location 'https://api.ngc.nvidia.com/v2/nvcf/functions' \ --header 'Content-Type: application/json' \ --header 'Accept: application/json' \ --header 'Authorization: Bearer $API_KEY' \ --data '{ "name": "my-model-function", "inferenceUrl": "/v2/models/my_model_image/infer", "healthUri": "/v2/health/ready", "inferencePort": 8000, "containerImage": "nvcr.io/$ORG_NAME/my_model_image:latest" }'

Additional Examples

See more examples of PyTriton containers that are Cloud Functions compatible here.

Triton-based Container Configuration

NVIDIA Cloud Functions is designed to working natively with Triton Inference Server based containers, including leveraging metrics and health checks from the server.

Pre-built Triton docker images can be found within NGC’s Container catalog. A minimum version of 23.04 (2.33.0) is required.

Configuration

The default health /v2/health/ready, port 8000, and inference endpoint (v2/models/$MODEL_NAME/infer) work automatically with Triton-based containers.

Note

The docker image’s run command must be configured with the following:

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CMD tritonserver --model-repository=${MODEL_PATH} --http-header-forward-pattern NVCF-.*

Here is an example of a Dockerfile:

Dockerfile

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FROM nvcr.io/nvidia/tritonserver:24.01-py3 # install requirements file COPY requirements.txt requirements.txt RUN pip install --no-cache-dir --upgrade pip RUN pip install --no-cache-dir -r requirements.txt COPY model_repository /model_repository ENV CUDA_MODULE_LOADING LAZY ENV LOG_VERBOSE 0 CMD tritonserver --log-verbose ${LOG_VERBOSE} --http-header-forward-pattern (nvcf-.*|NVCF-.*) \ --model-repository /model_repository/ --model-control-mode=none --strict-readiness 1


See a full example of a Triton container.

Creating Functions with NGC Models & Resources

When creating a function, models and resources can be mounted to the function instance. The models will be available under /config/models/{modelName} and /config/resources/{resourceName} where modelName and resourceName are specified as part of the API request.

Here is an example where a model and resource are added to a function creation API call, for an echo sample function:

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curl -X 'POST' \ 'https://api.nvcf.nvidia.com/v2/nvcf/functions' \ -H 'Authorization: Bearer $API_KEY' \ -H 'accept: application/json' \ -H 'Content-Type: application/json' \ -d '{ "name": "echo_function", "inferenceUrl": "/echo", "containerImage": "nvcr.io/$ORG_NAME/echo:latest", "apiBodyFormat": "CUSTOM", "models": [ { "name": "simple_int8", "version": "1", "uri": "v2/org/cf/$ORG_NAME/models/simple_int8/versions/1/zip" } ], "resources": [ { "name": "simple_resource", "version": "1", "uri": "v2/org/cf/$ORG_NAME/resources/simple_resource/versions/1/zip" } ] }'

Within the container once the function instance is deployed, the model would be mounted at /config/models/simple_int8 and resource mounted at /config/resources/simple_int8

Creating gRPC-based Functions

Cloud Functions supports function invocation via gRPC. During function creation, specify that the function is a gRPC function by setting the “Inference Protocol”, or inferenceUrl field to grpc.nvcf.nvidia.com:443.

Prerequisites

  • The function container must implement a gRPC port, endpoint and health check. The health check is expected to be served by the gRPC inference port, there is no need to define a separate health endpoint path.

gRPC Function Creation via UI

In the Function Creation Page, set the “Inference Protocol” to gRPC and port to whatever your gRPC server has implemented.

grpc-function-creation.png

gRPC Function Creation via CLI

When creating the gRPC function, set the --inference-url argument to grpc.nvcf.nvidia.com:443:

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ngc cf function create --inference-port 8001 --container-image nvcr.io/$ORG_NAME/grpc_echo_sample:latest --name my-grpc-function --inference-url grpc.nvcf.nvidia.com:443

gRPC Function Creation via API

When creating the gRPC function, set the inferenceURl field to grpc.nvcf.nvidia.com:443:

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curl --location 'https://api.ngc.nvidia.com/v2/nvcf/functions' \ --header 'Content-Type: application/json' \ --header 'Accept: application/json' \ --header 'Authorization: Bearer $API_KEY' \ --data '{ "name": "my-grpc-function", "inferenceUrl": "grpc.nvcf.nvidia.com:443", "inferencePort": 8001, "containerImage": "nvcr.io/$ORG_NAME/grpc_echo_sample:latest" }'

gRPC Function Invocation

See gRPC Invocation for details on how to authenticate and invoke your gRPC function.

Available Container Variables

The following is a reference of available variables via the headers of the invocation message (auto-populated by Cloud Functions), accessible within the container.

For examples of how to extract and use some of these variables, see NVCF Container Helper Functions.

Name

Description

NVCF-REQID Request ID for this request.
NVCF-SUB Message subject.
NVCF-NCAID Function’s organization’s NCA ID.
NVCF-FUNCTION-NAME Function name.
NVCF-FUNCTION-ID Function ID.
NVCF-FUNCTION-VERSION-ID Function version ID.
NVCF-ASSET-DIR Asset directory path. Not available for helm deployments.
NVCF-LARGE-OUTPUT-DIR Large output directory path.
NVCF-MAX-RESPONSE-SIZE-BYTES Max response size in bytes for the function.
NVCF-NSPECTID NVIDIA reserved variable.
NVCF-BACKEND Backend or “Cluster Group” the function is deployed on.
NVCF-INSTANCETYPE Instance type the function is deployed on.
NVCF-REGION Region or zone the function is deployed in.
NVCF-ENV Spot environment if deployed on spot instances.

Adding Partial Response (Progress)

Below are instructions on setting up output directories and efficiently tracking and communicating inferencing progress using Cloud Functions. This functionality is only supported for container-based functions.

  • Cloud Functions automatically configures the output directory for you. To access the path, simply read the NVCF-LARGE-OUTPUT-DIR header. NVCF-LARGE-OUTPUT-DIR points to the directory for that particular requestId.

  • To enable partial progress reporting, you will need to store partial and completed outputs, and create a progress file in the output directory.

  • Once the output file and progress file are correctly set up in the output directory under the correct request id, Cloud Functions will automatically detect them.

  • When using the invocation API to poll for a response, progress will be returned as the header NVCF-PERCENT-COMPLETE, along with any partial response data.

Storing Partial and Complete Outputs

  1. When your Custom BLS generates large outputs, save them temporarily with the “*.partial” extension inside the NVCF-LARGE-OUTPUT-DIR directory. For instance, if you’re writing an image, name it image1.partial.

  2. Once the writing of the output file is complete, rename it from “*.partial” to its appropriate extension. Continuing with our example, rename image1.partial to image1.jpg.

Creating a Progress File

Cloud Functions actively observes the output directory for a file named progress. This file is used to communicate progress and partial responses back to the caller.

This file should contain well-formed JSON data. Structure the JSON content as follows:

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{ "id": "{requestId}", "progress": 50, "partialResponse": { "exampleKey": "Insert any well-formed JSON here, but ensure its size is less than 250K" } }

Replace requestId with the actual request id if it’s present. Modify the progress integer as needed, ranging from 0 (just started) to 100 (fully complete). Within partialResponse, insert any JSON content you want to send as a partial response, making sure it’s smaller than 250KB.

Best Practices

  • Always use the “.partial” extension to avoid sending partial or incomplete data.

  • Rename to the final extension only when the writing process is fully complete.

  • Ensure your progress file remains under 250KB to maintain efficiency and avoid errors.

It’s possible to deploy a model hosted within NGC Private Registry directly leveraging Triton Inference Server and Triton’s Auto-Generated Model Configuration. However, if a more complicated setup is required a complete model configuration will need to be created. Please see the Triton Model Configuration documentation to learn more.

Once the model is uploaded, the inputs will be automatically discovered and deployed as part of the endpoint.

Model-only function creation has the following limitations:

  • Function invocation is only supported via HTTP

  • Defining custom logic within the function is not possible

  • Models are loaded in at start time

  • Inference inputs should not exceed 5MB

Model Creation Resources

Here are some other examples of how to create more complex workflows within Triton:

Upload the Model

  1. Ensure you have an API key created, see Generate an NGC Personal API Key.

  2. Ensure you have the NGC CLI configured.

  3. Via terminal, navigate to the directory where the model file is present.

  4. Upload the model to your NGC Private Registry by running the following command:

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ngc registry model upload-version $ORG_NAME/$MODEL_NAME:v1 --gpu-model '$GPU' --source ./$PATH/$TO/$MODEL_NAME

Refer to NGC Models for further guidance on creating models.

  1. After the upload is complete, you will receive an upload summary confirming the status:

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Model ID: $MODEL_NAME[version=v1] Upload status: Completed ...

Create a Model-Only Function

See below for an example API call creating a function based only on a model.

Note

Note that the containerImage is omitted from the request. This function will use the Triton Inference Server.

Model-only functions use the Predict Protocol - Version 2 for the requestBody (input & output), therefore, you must set the apiBodyFormat to PREDICT_V2.

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curl -X 'POST' \ 'https://api.nvcf.nvidia.com/v2/nvcf/functions' \ -H 'Authorization: Bearer $API_KEY' \ -H 'accept: application/json' \ -H 'Content-Type: application/json' \ -d '{ "name": "my-test-function", "inferenceUrl": "v2/models/my-model/infer", "models": [ { "name": "my-model", "version": "1", "uri": "v2/org/cf/$ORG_NAME/models/my-model/versions/1/zip" } ], "apiBodyFormat": "PREDICT_V2" }'

Cloud functions supports helm-based functions for orchestration across multiple containers.

Prerequisites

  1. The helm chart must have a “mini-service” container defined, which will be used as the inference entry point.

  2. The name of this service in your helm chart should be supplied by setting helmChartServiceName during function definition. This allows Cloud Functions to communicate and make inference requests to the “mini-service” endpoint.

Attention

The servicePort defined within the helm chart should be used as the inferencePort supplied during function creation. Otherwise, Cloud Functions will not be able to reach the “mini-service”.

  1. Ensure you have the NGC CLI configured and have pushed your helm chart to NGC Private Registry. Refer to Managing Helm Charts Using the NGC CLI.

Secret Management

For pulling containers defined as part of the helm chart from NGC Private Registry, a new value named ngcImagePullSecretName needs to be defined in the chart.cThe value is referred in deployment spec as spec.imagePullSecrets.name of pods in chart.

Warning

Containers defined in the helm chart should be in the same NGC Organization and Team that the helm chart itself is being pulled from.

Create a Helm-based Function

  1. Ensure your helm chart is uploaded to NGC Private Registry and adheres to the Prerequisites listed above.

  2. Create the function:

    • Include the following additional parameters in the function definition

      • helmChart

      • helmChartServiceName

    • The helmChart property should be set to the URL hosted by the NGC Model Registry pointing to the helm chart that will deploy the “mini-service”. Please note, this helm chart URL should be accessible to the NGC org in which function will eventually be deployed in.

    • The helmChartServiceName is used for checking if the “mini-service” is ready for inference and is also scraped for function metrics. At this time, templatized service names are not supported. This must match the service name of your “mini-service” with the exposed entrypoint port.

Example Creation via API

Please see our sample helm chart used in this example for reference.

Below is an example function creation API call creating a helm-based function:

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curl -X 'POST' \ 'https://api.nvcf.nvidia.com/v2/nvcf/functions' \ -H 'Authorization: Bearer $API_KEY' \ -H 'accept: application/json' \ -H 'Content-Type: application/json' \ -d '{ "name": "function_name", "inferenceUrl": "v2/models/model_name/versions/model_version/infer", "inferencePort": 8001, "helmChart": "https://helm.ngc.nvidia.com/$ORG_NAME/charts/inference-test-1.0.tgz", "helmChartServiceName": "service_name", "apiBodyFormat": "CUSTOM" }'

Note

For gRPC based functions, set "inferenceURL" : "/gRPC". This signals to Cloud Functions that the function is using gRPC protocol and is not expected to have a /gRPC endpoint exposed for inferencing requests.

  1. Proceed with function deployment and invocation normally.

Limitations

When using helm charts, the following limitations needs to be taken into consideration
  • Automatic mounting of NGC Models and Resources for your container is not supported.

  • For any downloads (such as of assets or models) occurring within your function’s containers, download size is limited by the disk space on the VM - for GFN this is 100GB approximately, and for other clusters this limit will vary.

  • Progress/partial response reporting is not supported, including any additional artifacts generated during inferencing. Consider opting for HTTP streaming or gRPC bidirectional support.

  • Supported k8s artifacts under Helm Chart Namespace are listed below. Others will be rejected:

    • Deployment

    • Service

    • ServiceAccount

    • Role & RoleBindings

    • ConfigMaps

    • Secrets


Helm Chart Overrides

To override keys in your helm chart values.yml, you can provide the configuration parameter and supply corresponding key value pairs in JSON format which you would like to be overridden when the function is deployed.

Example helm chart override

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curl -X 'POST' \ 'https://api.nvcf.nvidia.com/v2/nvcf/deployments/functions/fe6e6589-12bb-423a-9bf6-8b9d028b8bf4/versions/fe6e6589-12bb-423a-9bf6-8b9d028b8bf4' \ -H 'Authorization: Bearer $API_KEY' \ -H 'accept: application/json' \ -H 'Content-Type: application/json' \ -d '{ "deploymentSpecifications": [{ "gpu": "L40", "backend": "OCI", "maxInstances": 2, "minInstances": 1 "configuration": { "key_one": "<value>", "key_two": { "key_two_subkey_one": "<value>", "key_two_subkey_two": "<value>" } ... }, { "gpu": "T10", "backend": "GFN", "maxInstances": 2, "minInstances": 1 }] }'


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