Custom Components

This is a guide on how to build a simple app and custom component spec and launch it via two different schedulers.

See the Quickstart Guide for installation and basic usage.

Hello World

Lets start off with writing a simple “Hello World” python app. This is just a normal python program and can contain anything you’d like.

Note

This example uses Jupyter Notebook %%writefile to create local files for example purposes. Under normal usage you would have these as standalone files.

%%writefile my_app.py

import sys
import argparse

def main(user: str) -> None:
    print(f"Hello, {user}!")

if __name__ == "__main__":
    parser = argparse.ArgumentParser(
        description="Hello world app"
    )
    parser.add_argument(
        "--user",
        type=str,
        help="the person to greet",
        required=True,
    )
    args = parser.parse_args(sys.argv[1:])

    main(args.user)

Overwriting my_app.py

Now that we have an app we can write the component file for it. This function allows us to reuse and share our app in a user friendly way.

We can use this component from the torchx cli or programmatically as part of a pipeline.

%%writefile my_component.py

import torchx.specs as specs

def greet(user: str, image: str = "my_app:latest") -> specs.AppDef:
    return specs.AppDef(
        name="hello_world",
        roles=[
            specs.Role(
                name="greeter",
                image=image,
                entrypoint="python",
                args=[
                    "-m", "my_app",
                    "--user", user,
                ],
            )
        ],
    )

Overwriting my_component.py

We can execute our component via torchx run. The local_cwd scheduler executes the component relative to the current directory.

%%sh
torchx run --scheduler local_cwd my_component.py:greet --user "your name"

torchx 2022-10-27 17:34:16 INFO     loaded configs from /Users/priyaramani/Workspace/repos/torchx/docs/source/.torchxconfig
torchx 2022-10-27 17:34:16 INFO     Log directory not set in scheduler cfg. Creating a temporary log dir that will be deleted on exit. To preserve log directory set the `log_dir` cfg option
torchx 2022-10-27 17:34:16 INFO     Log directory is: /var/folders/ck/dsbpg4794mn2nfwc_wr5_fn40000gn/T/torchx_ukf7jjfm
torchx 2022-10-27 17:34:16 INFO     Waiting for the app to finish...
greeter/0 Hello, your name!
torchx 2022-10-27 17:34:17 INFO     Job finished: SUCCEEDED

local_cwd://torchx/hello_world-pmmv1cm65tmpgd

If we want to run in other environments, we can build a Docker container so we can run our component in Docker enabled environments such as Kubernetes or via the local Docker scheduler.

Note

This requires Docker installed and won’t work in environments such as Google Colab. If you have not done so already follow the install instructions on: https://docs.docker.com/get-docker/

%%writefile Dockerfile.custom

FROM ghcr.io/pytorch/torchx:0.1.0rc1

ADD my_app.py .

Overwriting Dockerfile.custom

Once we have the Dockerfile created we can create our docker image.

%%sh
docker build -t my_app:latest -f Dockerfile.custom .

#1 [internal] load build definition from Dockerfile.custom
#1 sha256:61fb24a3f30b30bf1722ffa46c850b6271dce79cc880cf1315f469ed3b274177
#1 transferring dockerfile: 104B 0.0s done
#1 DONE 0.0s

#2 [internal] load .dockerignore
#2 sha256:566d6af428a265e63eaee87de7d011d92729024b7c0db0b90602038ae3e74218
#2 transferring context: 2B done
#2 DONE 0.0s

#3 [internal] load metadata for ghcr.io/pytorch/torchx:0.1.0rc1
#3 sha256:633e8f8dd2a3a4495d5dae7e523213a3449a3deffb6475efdd19f7312a781606
#3 DONE 1.4s

#4 [1/2] FROM ghcr.io/pytorch/torchx:0.1.0rc1@sha256:a738949601d82e7f100fa1efeb8dde0c35ce44c66726cf38596f96d78dcd7ad3
#4 sha256:9bc06e9084b68d5654928a267982308c15642a3206ba66cda0701bed701b3e4e
#4 DONE 0.0s

#5 [internal] load build context
#5 sha256:ff072a7cde843d0636ac5f5ecd87b11f10b0698e4ea0fbb0d90da04d12fd015e
#5 transferring context: 425B done
#5 DONE 0.0s

#6 [2/2] ADD my_app.py .
#6 sha256:0c58fd009420150178e4bfdf7a0487adfd64daaec16404349f83e1f8a3cda71a
#6 CACHED

#7 exporting to image
#7 sha256:e8c613e07b0b7ff33893b694f7759a10d42e180f2b4dc349fb57dc6b71dcab00
#7 exporting layers done
#7 writing image sha256:eb931e46390433da7ea61b14a54a91affb86c7ce64d33f1c3e7a961f56cf98b4 done
#7 naming to docker.io/library/my_app:latest done
#7 DONE 0.0s

Use 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them

We can then launch it on the local scheduler.

%%sh
torchx run --scheduler local_docker my_component.py:greet --image "my_app:latest" --user "your name"

torchx 2022-10-27 17:34:21 INFO     loaded configs from /Users/priyaramani/Workspace/repos/torchx/docs/source/.torchxconfig
torchx 2022-10-27 17:34:21 INFO     Checking for changes in workspace `file:///Users/priyaramani/Workspace/repos/torchx/docs/source`...
torchx 2022-10-27 17:34:21 INFO     To disable workspaces pass: --workspace="" from CLI or workspace=None programmatically.
torchx 2022-10-27 17:34:23 WARNING  failed to pull image my_app:latest, falling back to local: 404 Client Error for http+docker://localhost/v1.41/images/create?tag=latest&fromImage=my_app: Not Found ("pull access denied for my_app, repository does not exist or may require 'docker login': denied: requested access to the resource is denied")
torchx 2022-10-27 17:34:24 INFO     Built new image `sha256:9215cebe702de996f350825c46b569d8b0d00260d90c40b18f8e0f7075c3f2d6` based on original image `my_app:latest` and changes in workspace `file:///Users/priyaramani/Workspace/repos/torchx/docs/source` for role[0]=greeter.
torchx 2022-10-27 17:34:25 INFO     Waiting for the app to finish...
greeter/0 Hello, your name!
torchx 2022-10-27 17:34:26 INFO     Job finished: SUCCEEDED

local_docker://torchx/hello_world-lt9qdxd3xbhgwd

If you have a Kubernetes cluster you can use the Kubernetes scheduler to launch this on the cluster instead.

$ docker push my_app:latest
$ torchx run --scheduler kubernetes my_component.py:greet --image "my_app:latest" --user "your name"

Builtins

TorchX also provides a number of builtin components with premade images. You can discover them via:

%%sh
torchx builtins

Found 10 builtin components:
  1. metrics.tensorboard
  2. serve.torchserve
  3. utils.binary
  4. utils.booth
  5. utils.copy
  6. utils.echo
  7. utils.python
  8. utils.sh
  9. utils.touch
 10. dist.ddp

You can use these either from the CLI, from a pipeline or programmatically like you would any other component.

%%sh
torchx run utils.echo --msg "Hello :)"

torchx 2022-10-27 17:34:28 INFO     loaded configs from /Users/priyaramani/Workspace/repos/torchx/docs/source/.torchxconfig
torchx 2022-10-27 17:34:29 INFO     Checking for changes in workspace `file:///Users/priyaramani/Workspace/repos/torchx/docs/source`...
torchx 2022-10-27 17:34:29 INFO     To disable workspaces pass: --workspace="" from CLI or workspace=None programmatically.
torchx 2022-10-27 17:34:31 INFO     Built new image `sha256:9215cebe702de996f350825c46b569d8b0d00260d90c40b18f8e0f7075c3f2d6` based on original image `ghcr.io/pytorch/torchx:0.3.0` and changes in workspace `file:///Users/priyaramani/Workspace/repos/torchx/docs/source` for role[0]=echo.
torchx 2022-10-27 17:34:31 INFO     Waiting for the app to finish...
torchx 2022-10-27 17:34:31 INFO     Job finished: SUCCEEDED
echo/0 Hello :)

local_docker://torchx/echo-g4tmlzd03ljjhd